Patent Publication Number: US-2022237998-A1

Title: Linkable led lighting system designed with an app based free setting method for adjusting operating parameters of at least one led security light

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This is a continuation application of prior application Ser. No. 16/985,557 filed on Aug. 5, 2020. Application Ser. No. 16/985,557 is a continuation in part application of prior application Ser. No. 16/668,599, filed Oct. 30, 2019, which issued as U.S. Pat. No. 10,770,916 on Sep. 8, 2020. Ser. No. 16/668,599 is a continuation of application Ser. No. 16/244,671, filed Jan. 10, 2019, which issued as U.S. Pat. No. 10,516,292 on Dec. 24, 2019. U.S. Pat. No. 10,516,292 is a continuation of application Ser. No. 15/896,403, filed Feb. 14, 2018, which issued as U.S. Pat. No. 10,225,902 on Mar. 5, 2019. U.S. Pat. No. 10,225,902 is a continuation of application Ser. No. 15/785,658, filed Oct. 17, 2017, which issued as U.S. Pat. No. 10,326,301 on Jun. 18, 2019. U.S. Pat. No. 10,326,301 is a continuation of application Ser. No. 15/375,777, filed Dec. 12, 2016, which issued as U.S. Pat. No. 9,826,590 on Nov. 21, 2017. U.S. Pat. No. 9,826,590 is a continuation of application Ser. No. 14/836,000, filed Aug. 26, 2015, which issued as U.S. Pat. No. 9,622,325 on Apr. 11, 2017. U.S. Pat. No. 9,622,325 is a divisional of application Ser. No. 14/478,150, filed Sep. 5, 2014, which issued as U.S. Pat. No. 9,445,474 on Sep. 13, 2016. U.S. Pat. No. 9,445,474 is a continuation of application Ser. No. 13/222,090, filed Aug. 31, 2011, which issued as U.S. Pat. No. 8,866,392 on Oct. 21, 2014. 
     INCORPORATION BY REFERENCE 
     The following prior arts with associated disclosures are herein requested to be incorporated into the current application: 
     1. U.S. Pat. No. 9,345,112 B2 titled “MICROCONTROLLER-BASED MULTIFUNCTIONAL ELECTRONIC SWITCH AND LIGHTING APPARATUS HAVING THE SAME” filed on Dec. 22, 2014 and granted on May 17, 2016. The &#39;112 patent is a continuation in part of the original application of U.S. Pat. No. 8,947,000 which is the first founding patent for a large family collection of member patents involving using the technology of the microcontroller based electronic switch to control a light intensity of a light-emitting unit. The &#39;112 patent is in turn the second founding patent for a subfamily of member patents involving using a technology of two LED loads emitting light with different color temperature to work with the technology of the microcontroller-based electronic switches to control a color temperature tuning and switching scheme of an LED load. 
     The applicant herein requests to incorporate the contents of the &#39;112 patent including all disclosures, embodiments and drawings to the specification of the current application according to MPEP 2163.07(b). 
     2. U.S. Pat. No. 10,136,503 B2 titled “MICROCONTROLLER-BASED MULTIFUNCTIONAL ELECTRONIC SWITCH AND LIGHTING APPARATUS HAVING THE SAME” filed on Sep. 13, 2017 and granted on Nov. 20, 2018. The &#39;503 patent is a member patent in the family collection of member patents under the first founding patent &#39;000 and is also a member patent in the subfamily collection of member patents under the second founding patent &#39;112. 
     The &#39;503 patent teaches a system and a method of using two microcontroller based electronic switches respectively connected to two LED loads emitting light with different color temperatures to control and allocate different electric powers respectively delivered to the two LED loads for performing multiple working modes including on/off control mode, dimming mode, color temperature tuning mode, color temperature switching mode, color temperature dim to warm mode, commanding mode for controlling a lighting family comprising a plurality of member lamps remotely located or delay shut off mode. 
     The applicant herein requests to incorporate the contents of the &#39;503 patent including all disclosures, embodiments and drawings to the specification of the current application according to MPEP 2163.07(b). 
     3. U.S. Pat. No. 10,470,276 B2 titled “METHOD OF TUNING LIGHT COLOR TEMPERATURE FOR LED LIGHTING DEVICE AND APPLICATION THEREOF” was filed on Oct. 17, 2018 and granted on Nov. 5, 2019. The &#39;276 patent teaches a method and application of performing a light color temperature tuning control for an LED lamp includes using a first LED load emitting light with a low color temperature and a second LED load emitting light with a second color temperature thru a light diffuser, using a power allocation circuitry working with a power allocation algorithm to control different electric power respectively delivered to the first LED load while keeping the total electric power unchanged to generate different diffused light color temperatures. 
     Applicant herein requests to incorporate the contents of the &#39;276 patent including all disclosures, embodiments and drawings by reference to the specification of the current application according to MPEP 2163.07(b). 
     4. U.S. Pat. No. 11,063,585 titled “METHOD OF TUNING LIGHT COLOR TEMPERATURE FOR LED LIGHTING DEVICE AND APPLICATION THEREOF” was continuation of application of the &#39;276 patent, filed on Aug. 7, 2019 and granted on Jul. 13, 2021. The &#39;585 patent discloses a theory and a technical foundation for building a technical frame of a color temperature tuning technology for an LED lamp composing a power allocation algorithm, a power allocation circuitry and at least one external control device for activating a color temperature tuning and switching scheme. 
     The applicant herein request to incorporate the contents of the &#39;585 patent including all disclosures, all embodiments and all drawings to the specification of the current application according to MPEP 2163.07(b). 
     5. U.S. Pat. No. 8,866,392 B2 titled “TWO-LEVEL LED SECURITY LIGHT WITH MOTION SENSOR” was filed on Aug. 31, 2011 and granted on Oct. 21, 2014. The &#39;392 patent discloses technologies for operating a two-level LED security light; at night the LED security light is automatically turned on for a low level illumination, when a motion intrusion signal is detected by the motion sensor, the LED security light is switched from the low level illumination with a low color temperature to a high level illumination with a high color temperature to maximize an effect of security alert for a short duration time, at dawn the LED security light is automatically turned off. 
     The &#39;392 patent is the founding application for a large family collection of member patents involving automatic illumination control technologies including light intensity tuning and light color temperature tuning. The applicant herein requests to incorporate the contents of the &#39;392 patent including all disclosures, embodiments and drawings to the specification of the current application according to MPEP 2163.07(b). 
     6. U.S. Pat. No. 10,516,292 B2 titled “TWO-LEVEL LED SECURITY LIGHT WITH MOTION SENSOR” was a member patent under the founding patent &#39;392, filed on Jan. 10, 2019 and granted on Dec. 24, 2019. The &#39;292 patent is a member patent in the family collection of patents under the founding patent &#39;392. 
     The &#39;292 patent discloses a lifestyle LED security light including a light-emitting unit configured with two sets of LED loads respectively emitting different color temperature light, at dusk the light-emitting unit is automatically turned on for a first level illumination with a low color temperature featuring an aesthetic night view with the motion sensor being deactivated for a first time duration, and then the light-emitting unit is changed to a second level illumination with motion sensor being activated, when the motion sensor detects a motion intrusion signal, the light-emitting unit is instantly switched to perform a third level illumination with a high light intensity and a high color temperature. The color temperatures of the first level illumination and the third level illumination are respectively adjustable by simultaneously and reversely adjusting the electric powers allocated to the two sets of LED loads. 
     The applicant herein request to incorporate the contents of the&#39;292 patent to the specification of the current application according to MPEP 2163.07(b). 
     7. U.S. Pat. No. 10,770,916 B2 titled “TWO-LEVEL LED SECURITY LIGHT WITH MOTION SENSOR” was filed on Oct. 30, 2019 and granted on Sep. 8, 2020. The &#39;916 patent is a member patent in the family collection of patents under the founding patent &#39;392. The &#39;916 patent teaches a method of configuring an LED light with a tunable diffused light color temperature. The method comprises using a light-emitting unit configured with a first LED load emitting light with a low color temperature and a second LED load emitting light with a high color temperature electrically connected in parallel, using a light diffuser to cover the first LED load and the second LED load create a diffused light with a diffused light color temperature, using two semiconductor switching devices working in conjunction with a controller to respectively control a first electric power delivered to the first LED load and a second electric power delivered to the second LED load to operate a color temperature tuning and switching scheme and using a first external control device to output at least one first external control signal to activate a selection of a diffused light color temperature. 
     The applicant herein requests to incorporate the contents of the &#39;916 patent including all disclosures, all embodiments and all drawings to the specification of the current application according to MPED 2163.07((b). 
     8. U.S. Pat. No. 10,763,691 B2 titled “TWO-LEVEL LED SECURITY LIGHT WITH MOTION SENSOR” was filed on Mar. 19, 2020 and granted on Sep. 1, 2020. The &#39;691 patent is a member patent in the family collection of patents under the original founding patent &#39;392. The &#39;691 patent discloses a technology of tuning the light color temperature of a lifestyle LED light by blending the two LED loads emitting light with different color temperatures thru a light diffuser with an arrangement that a first electric power delivered to a first LED load emitting light with a low color temperature and a second electric power delivered to a second LED load emitting light with a high color temperature are reversely and complementarily adjusted for tuning a diffused light color temperature such that a total light intensity generated by the LED light is kept essentially unchanged. 
     The applicant herein requests to incorporate the contents of the &#39;691 patent including all disclosures, embodiments and drawings to the specification of the current application according to MPEP 2163.07(b). 
     9. U.S. Pat. No. 10,187,947 B2 titled “LIFE-STYLE LED SECURITY LIGHT” was issued on Jan. 22, 2019. The applicant herein requests to incorporate the contents of the &#39;947 patent including all disclosures, embodiments and drawings to the specification of the current application according to MPEP 2163.07(b). 
     10. U.S. Pat. No. 10,491,032 B2 titled “LIFESTYLE SECURITY LIGHT” was issued on Nov. 26, 2019. The applicant herein requests to incorporate the contents of the &#39;032 patent including all disclosures, embodiments and drawings to the specification of the current application according to MPEP 2163.07(b). 
     11. U.S. Pat. No. 10,225,902 B2 titled “TWO-LEVEL SECURITY LIGHT WITH MOTION SENSOR” was issued on Mar. 5, 2019. The applicant herein requests to incorporate the contents of the &#39;902 patent including all disclosures, embodiments and drawings to the specification of the current application according to MPEP 2163.07(b). 
     12. U.S. Pat. No. 10,326,301 B2 titled “TWO-LEVEL LED SECURITY LIGHT WITH MOTION SENSOR” was issued on Jun. 18, 2019. The applicant herein requests to incorporate the contents of the &#39;301 patent including all disclosures, embodiments and drawings to the specification of the current application according to MPEP 2163.07(b). 
     13. U.S. Pat. No. 9,326,362 B2 titled “TWO-LEVEL LED SECURITY LIGHT WITH MOTION SENSOR” was issued on Apr. 26, 2016. The applicant herein requests to incorporate the contents of the &#39;362 patent including all disclosures, embodiments and drawings to the specification of the current application according to MPEP 2163.07(b). 
     14. U.S. Pat. No. 9,560,719 B2 titled “LED SECURITY LIGHT AND LED SECURITY LIGHT CONTROL DEVICE THEREOF” was issued on Jan. 31, 2017. The applicant herein requests to incorporate the contents of the &#39;719 patent including all disclosures, embodiments and drawings to the specification of the current application according to MPEP 2163.07(b). 
     15. U.S. Pat. No. 10,154,564 B2 titled “APP BASED FREE SETTING METHOD FOR SETTING OPERATING PARAMETER OF SECURITY LIGHT” was issued on Dec. 11, 2018. The applicant herein requests to incorporate the contents of the &#39;564 patent including all disclosures, embodiments and drawings to the specification of the current application according to MPEP 2163.07(b). 
     16. U.S. Pat. No. 10,667,367 B2 titled “APP BASED FREE SETTING METHOD FOR SETTING OPERATING PARAMETER OF SECURITY LIGHT” was issued on May 26, 2020. The applicant herein requests to incorporate the contents of the &#39;367 patent including all disclosures, embodiments and drawings to the specification of the current application according to MPEP 2163.07(b). 
    
    
     BACKGROUND OF THE INVENTION 
     1. Technical Field 
     The present disclosure relates to an LED lighting apparatus, in particular, to a linkable LED lighting system designed with an on line free setting capacity of operating parameters. In the present disclosure, a total of 12 prior arts belonging to same family of patents under U.S. Pat. No. 8,866,392 and a total of 4 prior arts belonging to same family of patents under U.S. Pat. No. 8,947,000 are incorporated for reference according to MPEP 2163.07(b), in which the prior patents U.S. Pat. Nos. 10,667,367 and 10,154,564 are specifically written to teach an APP based free setting method for setting operating parameters of a security light. 
     2. Description of Related Art 
     Lighting sources such as the fluorescent lamps, the incandescent lamps, the halogen lamps, and the light-emitting diodes (LED) are commonly found in lighting apparatuses for illumination purpose. Photoresistors are often utilized in outdoor lighting applications for automatic illuminations, known as the Photo-Control (PC) mode. Timers may be used in the PC mode for turning off the illumination or for switching to a lower level illumination of a lighting source after the lighting source having delivered a high level illumination for a predetermined duration, referred as the Power-Saving (PS) mode. Motion sensors are often used in the lighting apparatus for delivering full-power illumination thereof for a short duration when a human motion is detected, then switching back to the PS mode. Illumination operation controls such as auto-illumination in accordance to the background brightness detection, illumination using timer, illumination operation control using motion sensing results (e.g., dark or low luminous power to fully illuminated), and brightness control are often implemented by complex circuitries. In particular, the design and construction of LED drivers are still of a complex technology with high fabrication cost. 
     Therefore, how to develop a simple and effective design method on illumination controls such as enhancing contrast in illumination and color temperature for various types lighting sources, especially the controls for LEDs are the topics of the present disclosure. 
     SUMMARY OF THE INVENTION 
     An exemplary embodiment of the present disclosure provides a two-level LED security light with motion sensor which may switch to high level illumination in the Power-Saving (PS) mode for a predetermined duration time when a human motion is detected thereby achieve warning purpose using method of electric current or lighting load adjustment. Furthermore, prior to the detection of an intrusion, the LED security light may be constantly in the low level illumination to save energy. 
     An exemplary embodiment of the present disclosure provides a two-level LED security light including a power supply unit, a light sensing control unit, a motion sensing unit, an external control unit, a loading and power control unit, and a light-emitting unit. The light-emitting unit further includes one or a plurality of series- and/or parallel-connected LEDs; when the light sensing control unit detects that the ambient light is lower than a predetermined value, the loading and power control unit turns on the light-emitting unit to generate a high level or a low level illumination; when the light sensing control unit detects that the ambient light is higher than the predetermined value, the loading and power control unit turns off the light-emitting unit; when the motion sensing unit detects a human motion in the PS mode, the loading and power control unit increases the electric current that flows through the light-emitting unit so as to generate the high or full level illumination for a predetermined duration. 
     Another exemplary embodiment of the present disclosure provides a two-level LED security light including a power supply unit, a light sensing control unit, a motion sensing unit, an external control unit, a loading and power control unit, a light-emitting unit. The light-emitting unit includes a plurality of series- and/or parallel-connected LEDs. When the light sensing control unit detects that the ambient light is lower than a predetermined value, the loading and power control unit turns on a portion or all the LEDs of the light-emitting unit to generate a low level or a high level illumination; when the light sensing control unit detects that the ambient light is higher than the predetermined value, the loading and power control unit turns off all the LEDs in the light-emitting unit; when the motion sensing unit detects a human motion in the PS mode, the loading and power control unit turns on a plurality of LEDs in the light-emitting unit and generates the high or full level illumination for a predetermine duration. An electric current control circuit is integrated in the exemplary embodiment for providing constant electric current to drive the LEDS in the light-emitting unit. 
     One exemplary embodiment of the present disclosure provides a two-level LED security light including a power supply unit, a light sensing control unit, a motion sensing unit, a loading and power control unit, and a light-emitting unit. The light-emitting unit includes a phase controller and one or a plurality of parallel-connected alternating current (AC)LEDs. The phase controller is coupled between the described one or a plurality parallel-connected ACLEDs and AC power source. The loading and power control unit may through the phase controller control the average power of the light-emitting unit; when the light sensing control unit detects that the ambient light is lower than a predetermined value, the loading and power control unit turns on the light-emitting unit to generate a high level or a lower level illumination; when the light sensing control unit detects that the ambient light is higher than the predetermined value, the loading and power control unit turns off the light-emitting unit; when the motion sensing unit detects a human motion in the PS mode, the loading and power control unit increases the average power of the light-emitting unit thereby generates the high level illumination for a predetermine duration. 
     According to an exemplary embodiment of the present disclosure, a two-level LED security light includes a power supply unit, a light sensing control unit, a motion sensing unit, a loading and power control unit, and a light-emitting unit. The light-emitting unit includes X high wattage ACLEDs and Y low wattage ACLEDs connected in parallel. When the light sensing control unit detects that the ambient light is lower than a predetermined value, the loading and power control unit turns on the plurality of low wattage ACLEDs to generate a low level illumination; when the light sensing control unit detects that the ambient light is higher than a predetermined value, the loading and power control unit turns off the light-emitting unit; when the motion sensor detects an intrusion, the loading and power control unit turns on both the high wattage ACLEDs and the low wattage ACLEDs at same time thereby generates a high level illumination for a predetermine duration, wherein X and Y are of positive integers. 
     According to an exemplary embodiment of the present disclosure, a two-level LED security light with motion sensor includes a power supply unit, a light sensing control unit, a motion sensing unit, a loading and power control unit, and a light-emitting unit. The light-emitting unit includes a rectifier circuit connected between one or a plurality of parallel-connected AC lighting sources and AC power source. The loading and power control unit may through the rectifier circuit adjust the average power of the light-emitting unit. When the light sensing control unit detects that the ambient light is lower than a predetermined value, the loading and power control unit turns on the light-emitting unit to generate a low level illumination; when the light sensing control unit detects that the ambient light is higher than the predetermined value, the loading and power control unit turns off the light-emitting unit; when the motion sensing unit detects an intrusion, the loading and power control unit increases the average power of the light-emitting unit thereby generates a high level illumination for a predetermine duration. The rectifier circuit includes a switch parallel-connected with a diode, wherein the switch is controlled by the loading and power control unit. 
     To sum up, a two-level LED security light with motion sensor provided by an exemplary embodiment in the preset disclosure, may execute Photo-Control (PC) and Power-Saving (PS) modes. When operates in the PC mode, the lighting apparatus may auto-illuminate at night and auto-turnoff at dawn. The PC mode may generate a high or a low level illumination for a predetermined duration then automatically switch to the PS mode by a control unit to generate a low level or a cutoff illumination. When the motion sensor detects a human motion, the disclosed LED security light may immediate switch to the high or full level illumination for a short predetermined duration thereby achieve illumination or warning effect. After the short predetermined duration, the LED security light may automatically return to the low level illumination for saving energy. Although ACLEDs are used in some embodiments, the present invention is not limited in applying on the ACLEDs. It can be implemented with DC LEDs or DC LEDs in AC module such as LED bulbs incorporating with adequate power sources and circuitries which commonly known by a person of skill in the art. 
     In order to further understand the techniques, means and effects of the present disclosure, the following detailed descriptions and appended drawings are hereby referred, such that, through which, the purposes, features and aspects of the present disclosure can be thoroughly and concretely appreciated; however, the appended drawings are merely provided for reference and illustration, without any intention to be used for limiting the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. 
         FIG. 1  schematically illustrates a block diagram of a two-level LED security light in accordance with an exemplary embodiment of the present disclosure. 
         FIG. 1A  is an enhanced block diagrammed under  FIG. 1  to specifically illustrate an embodiment of  FIG. 1  for a two-level LED security light, wherein the loading and power control unit comprises a switching circuitry and a microcontroller, wherein the switching circuitry further comprises a bidirectional semiconductor switching device for controlling an average electric power to be delivered to the LED. 
         FIG. 1B  is an enhanced block diagrammed under  FIG. 1  to specifically illustrate an embodiment of  FIG. 1  for a two-level LED security light, wherein the loading and power control unit comprises a switching circuitry and a microcontroller, wherein the switching circuitry further comprises an unidirectional semiconductor switching device for controlling an average electric power to be delivered to the LED. 
         FIG. 1C  is an enhanced block diagrammed under  FIG. 1  to specifically illustrate an embodiment of  FIG. 1  for a two-level LED security light including a first set having N number LEDs and a second set having M number LEDs, wherein the loading and power control unit comprises a switching circuitry and a microcontroller, wherein the switching circuitry further comprises bidirectional semiconductor switching devices for controlling an average electric power to be delivered to the LED. 
         FIG. 1D  is an enhanced block diagrammed under  FIG. 1  to specifically illustrate an embodiment of  FIG. 1  for a two-level LED security light including a first set having N number LEDs and a second set having M number LEDs, wherein the loading and power control unit comprises a switching circuitry and a microcontroller, wherein the switching circuitry further comprises unidirectional semiconductor switching devices for controlling an average electric power to be delivered to the LED. 
         FIG. 2A  illustrates a schematic diagram of a two-level LED security light in accordance to the first exemplary embodiment of the present disclosure. 
         FIG. 2B  graphically illustrates a timing waveform of a pulse width modulation (PWM) signal in accordance to the first exemplary embodiment of the present disclosure. 
         FIG. 3A  illustrates a schematic diagram of a two-level LED security light in accordance to the second exemplary embodiment of the present disclosure. 
         FIG. 3B  illustrates a schematic diagram of a two-level LED security light in accordance to the second exemplary embodiment of the present disclosure. 
         FIG. 4A  illustrates a schematic diagram of a two-level LED security light in accordance to the third exemplary embodiment of the present disclosure. 
         FIG. 4B  illustrates a timing waveform of two-level LED security light in accordance to the third exemplary embodiment of the present disclosure. 
         FIG. 5  illustrates a schematic diagram of a two-level LED security light in accordance to the third exemplary embodiment of the present disclosure. 
         FIG. 6  illustrates a schematic diagram of a two-level LED security light in accordance to the fourth exemplary embodiment of the present disclosure. 
         FIG. 7  illustrates a schematic diagram of a two-level LED security light in accordance to the fifth exemplary embodiment of the present disclosure. 
         FIGS. 8A, 8B, 8C and 8D  schematically and respectively show I-V relationship charts (Forward Current vs. Forward Voltage) for a white LED chip from each of 4 different LED manufacturers. 
         FIG. 9  is a data sheet showing data of the minimum forward voltages and maximum forward voltages collected from various LED manufacturers for generating a designated constant forward current to produce a required lumens output. 
         FIG. 10A  illustrates a block diagram of a connectivity APP loaded in a mobile device in accordance to an exemplary embodiment of the present disclosure. 
         FIG. 10B  illustrates a schematic diagram of an LED security light in accordance to an exemplary embodiment of the present disclosure. 
         FIG. 10C  illustrates a schematic diagram of another LED security light in accordance to an exemplary embodiment of the present disclosure. 
         FIG. 10D  illustrates a system block for establishing a linkable electric apparatuses system in accordance to a generalized exemplary embodiment of the present disclosure. 
         FIG. 11  illustrates a system flow chart to elucidate a method in setting identification codes for grouping and interlinking LED security light based on  FIG. 10A  and  FIG. 10B  in accordance to an exemplary embodiment of the present disclosure. 
         FIG. 12  illustrates a flow chart to elucidate a system dynamic for operating a linkable LED security lighting system based on  FIG. 10A  and  FIG. 10B  in accordance to an exemplary embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Reference is made in detail to the exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or alike parts. 
     First Exemplary Embodiment 
     Refer to  FIG. 1 , which schematically illustrates a block diagram of a two-level LED security light in accordance to the first exemplary embodiment of the present disclosure. A two-level LED security light (herein as the lighting apparatus)  100  includes a power supply unit  110 , a light sensing control unit  120 , a motion sensing unit  130 , an external control unit  160 , a loading and power control unit  140 , and a light-emitting unit  150 . The power supply unit  110  is used for supplying power required to operate the system, wherein the associated structure includes the known AC/DC power converter. The light sensing control unit  120  may be a photoresistor, which may be coupled to the loading and power control unit  140  for determining daytime or nighttime in accordance to the ambient light. The motion sensing unit  130  may be a passive infrared sensor (PIR), which is coupled to the loading and power control unit  140  and is used to detect intrusions. When a person is entering a predetermined detection zone of the motion sensing unit  130 , a sensing signal thereof may be transmitted to the loading and power control unit  140 . The external control unit  160  is coupled to the loading and power control unit  140  for setting various operating parameters of a security light including at least a time length setting (a time setting unit) for various illumination modes, at least a light intensity setting for various illumination modes and switching between illumination modes. The external control unit  160  may be configured with a push button, a touch sensor, a voltage divider, a power interruption detection circuitry or a wireless remote control receiver for processing signals interpretable by the loading and power control unit  140 . 
     The loading and power control unit  140  which is coupled to the light-emitting unit  150  may be implemented by a microcontroller. The loading and power control unit  140  may control the illumination levels of the light-emitting unit  150  in accordance to the sensing signal outputted by the light sensing control unit  120  and the motion sensing unit  130 . The light-emitting unit  150  may include a plurality of LEDs and switching components. The loading and power control unit  140  may control the light-emitting unit  150  to generate at least two levels of illumination variations. 
     When the light sensing control unit  120  detects that the ambient light is lower than a predetermined value (i.e., nighttime), the loading and power control unit  140  executes the Photo-Control (PC) mode by turning on the light-emitting unit  150  to generate a high level illumination for a predetermined duration then return to a low level illumination for Power-Saving (PS) mode. When the light sensing control unit  120  detects that the ambient light is higher than a predetermined value (i.e., dawn), the loading and power control unit  140  turns off the light-emitting unit  150 . In the PS mode, when the motion sensing unit  130  detects a human motion, the loading and power control unit  140  may increase the electric current which flow through the light-emitting unit  150 , to generate the high level illumination for a short predetermined duration. After the short predetermined duration, the loading and power control unit  140  may automatically lower the electric current that flow through the light-emitting unit  150  thus have the light-emitting unit  150  return to low level illumination for saving energy. 
     Refer to  2 A, which illustrates a schematic diagram of a two-level LED security light in accordance to the first exemplary embodiment of the present disclosure. The light sensing control unit  120  may be implemented by a light sensor  220 ; the motion sensing unit  130  may be implemented by a motion sensor  230 ; the loading and power control unit  140  may be implemented by a microcontroller  240 . The light-emitting unit  250  includes three series-connected LEDs L 1 ˜L 3 . The LEDs L 1 ˜L 3  is connected between a DC source and a transistor Q 1 , wherein the DC source may be provided by the power supply unit  110 . The transistor Q 1  may be an N-channel metal-oxide-semiconductor field-effect-transistor (NMOS). The transistor Q 1  is connected between the three series-connected LEDs L 1 ˜L 3  and a ground GND. The loading and power control unit  140  implemented by the microcontroller  240  may output a pulse width modulation (PWM) signal to the gate of transistor Q 1  to control the average electric current. It is worth to note that the electric components depicted in  FIG. 2A  only serves as an illustration for the exemplary embodiment of the present disclose and hence the present disclosure is not limited thereto. 
     Refer to  FIG. 2B  concurrently, which graphically illustrates a timing waveform of a pulse width modulation (PWM) signal in accordance to the first exemplary embodiment of the present disclosure. In the PC mode, the PWM signal may be used to configure the transistor Q 1  to have the conduction period T on  being longer than the cut-off period T off . On the other hand in the PS mode, the PWM signal may configure the transistor Q 1  to have the conduction period T on  being shorter than the cut-off period T off . In comparison of the illumination levels between the PC and PS modes, as the conduction period T on  of transistor Q 1  being longer under the PC mode, therefore have higher average electric current driving the light-emitting unit  250  thereby generate high illumination, which may be classified as the high level illumination; whereas as the conduction period T on  of transistor Q 1  is shorter in the PS mode, therefore have lower average electric current driving the light-emitting unit  250  thereby generate low illumination, which may be classified as the low level illumination. 
     The microcontroller  240  turns off the light-emitting unit  250  during the day and activates the PC mode at night by turning on the light-emitting unit  250  to generate the high level illumination for a short predetermined duration then return to the low level illumination thereby entering the PS mode. When the motion sensor  230  detects a human motion in the PS mode, the light-emitting unit  250  may switch to the high level illumination for illumination or warning application. The light-emitting unit  250  may return to the low level illumination after maintaining at the high level illumination for a short predetermined duration to save energy. 
     In addition, the microcontroller  240  is coupled to a time setting unit  260 , wherein the time setting unit  260  may allow the user to configure the predetermined duration associated with the high level illumination in the PC mode, however the present disclosure is not limited thereto. The time setting unit is a type of external control units designed to process various external control signals interpretable by the controller for setting at least a time length setting for various illumination modes. 
     Second Exemplary Embodiment 
     Refer again to  FIG. 1 , wherein the illumination variations of the light-emitting unit  150  may be implemented through the number of light-source loads being turned on to generate more than two levels of illumination. The lighting apparatus  100  in the instant exemplary embodiment may be through turning on a portion of LEDs or all the LEDs to generate a low and a high level of illuminations. 
     Refer to  FIG. 3A  concurrently, which illustrates a schematic diagram of a two-level LED security light  100  in accordance to the second exemplary embodiment of the present disclosure. The main difference between  FIG. 3A  and  FIG. 2A  is in the light-emitting unit  350 , having three series-connected LEDs L 1 ˜L 3  and NMOS transistors Q 1  and Q 2 . The LEDs L 1 ˜L 3  are series connected to the transistor Q 1  at same time connected between the DC source and a constant electric current control circuit  310 . Moreover, transistor Q 2  is parallel connected to the two ends associated with LEDs L 2  and L 3 . The gates of the transistors Q 1  and Q 2  are connected respectively to a pin PC and a pin PS of the microcontroller  240 . The constant electric current control circuit  310  in the instant exemplary embodiment maintains the electric current in the activated LED at a constant value, namely, the LEDs L 1 ˜L 3  are operated in constant-current mode. 
     Refer to  FIG. 3A , the pin PC of the microcontroller  240  controls the switching operations of the transistor Q 1 ; when the voltage level of pin PC being either a high voltage or a low voltage, the transistor Q 1  may conduct or cut-off, respectively, to turn the LEDs L 1 ˜L 3  on or off. The pin PS of the microcontroller  240  controls the switch operations of the transistor Q 2 , to form two current paths  351  and  352  on the light-emitting unit  350 . When the voltage at the pin PS of the microcontroller  240  is high, the transistor Q 2  conducts, thereby forming the current path  351  passing through the LED L 1  and the transistor Q 2 ; when the voltage at the pin PS being low, the transistor Q 2  cuts-off, thereby forming the current path  352  passing through all the LEDs L 1 ˜L 3 . The microcontroller  240  may then control the switching operation of the transistor Q 2  to turn on the desired number of LEDs so as to generate a high or a low level illumination. 
     When light sensor  220  detects that the ambient light is higher than a predetermined value, the microcontroller  240  through the pin PC outputs a low voltage, which causes the transistor Q 1  to cut-off and turns off all the LEDs L 1 ˜L 3  in the light-emitting unit  350 . Conversely, when the light sensor  220  detects that the ambient light is lower than the predetermined value, the microcontroller  240  activates the PC mode, i.e., outputting a high voltage from pin PC and a low voltage from pin PS, to activate the transistor Q 1  while cut-off the transistor Q 2 , thereby forming the current path  352 , to turn on the three LEDs L 1 ˜L 3  in the light-emitting unit  350  so as to generate the high level illumination for a predetermined duration. After the predetermined duration, the microcontroller  240  may switch to the PS mode by having the pin PC continue outputting a high voltage and the pin PS outputting a high voltage, to have the transistor Q 2  conducts, thereby forming the current path  351 . Consequently, only the LED L 1  is turned on and the low level illumination is generated. 
     When the motion sensor detects a human motion in the PS mode, the pin PS of the microcontroller  240  temporarily switches from the high voltage to a low voltage, to have the transistor Q 2  temporarily cuts-off thus forming the current path  352  to activate all the LEDs in the light-emitting unit  350 , thereby temporarily generates the high level illumination. The light-emitting unit  350  is driven by a constant electric current, therefore the illumination level generated thereof is directly proportional to the number of LEDs activated.  FIG. 3B  illustrates another implementation for  FIG. 3A , wherein the relays J 1  and J 2  are used in place of NMOS transistors to serve as switches. The microcontroller  240  may control the relays J 2  and J 1  through regulating the switching operations of the NPN bipolar junction transistors Q 4  and Q 5 . Moreover, resistors R 16  and R 17  are current-limiting resistors. 
     In the PC mode, the relay J 1  being pull-in while the relay J 2  bounce off to have constant electric current driving all the LEDs L 1 ˜L 3  to generate the high level illumination; in PS mode, the relays J 1  and J 2  both pull-in to have constant electric current only driving the LED L 1  thus the low level illumination may be thereby generated. Furthermore, when the motion sensor  230  detects a human motion, the pin PS of the microcontroller  240  may temporarily switch from high voltage to low voltage, forcing the relay J 2  to temporarily bounce off and the relay J 1  pull-in so as to temporarily generate the high level illumination. 
     The LED L 1  may adopt a LED having a color temperature in a range between 2000K and 3000K, while the LEDs L 2  and L 3  may adopt LEDs having a color temperature between 4000K and 6500K in order to increase the contrast between the high level and the low level illuminations. The number of LEDs included in the light-emitting unit  350  may be more than three, for example five or six LEDs. The transistor Q 2  may be relatively parallel to the two ends associated with a plurality of LEDs to adjust the illumination difference between the high and the low illumination levels. Additionally, the light-emitting unit  350  may include a plurality of transistors Q 2 , which are respectively coupled to the two ends associated with each LED to provide more lighting variation selections. The microcontroller  240  may decide the number of LEDs to turn on in accordance to design needs at different conditions. Based on the explanation of the aforementioned exemplary embodiment, those skills in the art should be able to deduce other implementation and further descriptions are therefore omitted. 
     Third Exemplary Embodiment 
     Refer back to  FIG. 1 , wherein the light-emitting unit  150  may include a phase controller and one or more parallel-connected alternating current (AC) LEDs. The phase controller is coupled between the described one or more parallel-connected ACLEDs and AC power source. The loading and power controller  140  in the instant exemplary embodiment may through the phase controller adjust the average power of the light-emitting unit  150  so as to generate variations in the low level and the high level illuminations. 
     Refer to  FIG. 4A , which illustrates a schematic diagram of a two-level LED security light  100  in accordance to the third exemplary embodiment of the present disclosure. The main difference between  FIG. 4A  and  FIG. 3  is in that the light-source load is an ACLED, which is coupled to the AC power source, and further the light-emitting unit  450  includes a phase controller  451 . The phase controller  451  includes a bi-directional switching device  452 , here, a triac, a zero-crossing detection circuit  453 , and a resistor R. The microcontroller  240  turns off the light-emitting unit  450  when the light sensor  220  detects that the ambient light is higher than a predetermined value. Conversely, when the light sensor  220  detects that the ambient light is lower than the predetermined value, the microcontroller  240  activates the PC mode by turning on the light-emitting unit  450 . In the PC mode, the microcontroller  240  may select a control pin for outputting a pulse signal which through a resistor R triggers the triac  452  to have a large conduction angle. The large conduction angle configures the light-emitting unit  450  to generate a high level illumination for a predetermined duration. Then the microcontroller  240  outputs the pulse signal for PS mode through the same control pin to trigger the triac  452  to have a small conduction angle for switching the light-emitting unit  450  from the high level illumination to the low level illumination of the PS mode. Moreover, when the motion sensor  230  (also called motion sensing unit) detects a human motion in the PS mode, the microcontroller  240  temporarily outputs the PC-mode pulse signal through the same control pin to have the light-emitting unit  450  generated the high level illumination for a short predetermined duration. After the short predetermined duration, the light-emitting unit  450  returns to the low level illumination. 
     In the illumination control of the ACLED, the microcontroller  240  may utilize the detected zero-crossing time (e.g., the zero-crossing time of an AC voltage waveform) outputted from the zero-crossing detection circuit  453  to send an AC synchronized pulse signal thereof which may trigger the triac  452  of the phase controller  451  thereby to change the average power input to the light-emitting unit  450 . As the ACLED has a cut-in voltage V t  for start conducting, thus if the pulse signal inaccurately in time triggers the conduction of the triac  452 , then the instantaneous value of AC voltage may be lower than the cut-in voltage V t  of ACLED at the trigger pulse. Consequently, the ACLED may result in the phenomenon of either flashing or not turning on. Therefore, the pulse signal generated by the microcontroller  240  must fall in a proper time gap behind the zero-crossing point associated with the AC sinusoidal voltage waveform. 
     Supposing an AC power source having a voltage amplitude V m  and frequency f, then the zero-crossing time gap t D  of the trigger pulse outputted by the microcontroller  240  should be limited according to t o &lt;t D &lt;½f−t o  for a light-source load with a cut-in voltage V t , wherein t o =(½πf)sin −1  (V t /V m ). The described criterion is applicable to all types of ACLEDs to assure that the triac  452  can be stably triggered in both positive and negative half cycle of the AC power source. Take ACLED with V t  (rms)=80V as an example, and supposing the V m (rms)=110V and f=60 Hz, then t o =2.2 ms and (½f)=8.3 ms may be obtained. Consequently, the proper zero-crossing time gap t D  associated with the phase modulation pulse outputted by the microcontroller  240  which lagged the AC sinusoidal voltage waveform should be designed in the range of 2.2 ms&lt;t D &lt;6.1 ms. 
     Refer to  FIG. 4B , which illustrates a timing waveform of the two-level LED security light in accordance to the third exemplary embodiment of the present disclosure. Waveforms (a)˜(d) of  FIG. 4B  respectively represent the AC power source, the output of the zero-crossing detection circuit  453 , the zero-crossing delay pulse at the control pin of the microcontroller  240 , and the voltage waveform across the two ends of the ACLED in the light-emitting unit  450 . The zero-crossing detection circuit  453  converts the AC voltage sinusoidal waveform associated with the AC power source to a symmetric square waveform having a low and a high voltage levels as shown in  FIG. 4B (b). At the zero-crossing point of the AC voltage sinusoidal wave, the symmetric square waveform may transit either from the low voltage level to the high voltage level or from the high voltage level to the low voltage level. Or equivalently, the edge of the symmetric square waveform in the time domain corresponds to the zero-crossing point of the AC voltage sinusoidal waveform. As shown in  FIG. 4B (c), the microcontroller  240  outputs a zero-crossing delay pulse in correspondence to the zero-crossing point of the AC sinusoidal waveform in accordance to the output waveform of the zero-crossing detection circuit  453 . The zero-crossing delay pulse is relative to an edge of symmetric square waveform behind a time gap t D  in the time domain. The t D  should fall in a valid range, as described previously, to assure that the triac  452  can be stably triggered thereby to turn on the ACLED.  FIG. 4B (d) illustrates a voltage waveform applied across the two ends associated with the ACLED. The illumination level of the light-emitting unit  450  is related to the conduction period t on  of the ACLED, or equivalently, the length t on  is directly proportional to the average power inputted to the ACLED. The difference between the PC mode and the PS mode being that in the PC mode, the ACLED has longer conduction period, thereby generates the high level illumination; whereas in the PS mode, the ACLED conduction period is shorter, hence generates the low level illumination. 
     Refer to  FIG. 5 , which illustrates a schematic diagram of a two-level LED security light  100  in accordance to the third exemplary embodiment of the present disclosure. The light-emitting unit  550  of the lighting apparatus  100  includes an ACLED 1 , an ACLED 2 , and a phase controller  551 . The phase controller  551  includes triacs  552  and  553 , the zero-crossing detection circuit  554  as well as resistors R 1  and R 2 . The light-emitting unit  550  of  FIG. 5  is different from the light-emitting unit  450  of  FIG. 4  in that the light-emitting unit  550  has more than one ACLEDs and more than one bi-directional switching devices. Furthermore, the color temperatures of the ACLED 1  and the ACLED 2  may be selected to be different. 
     In the exemplary embodiment of  FIG. 5 , the ACLED 1  has a high color temperature, and the ACLED 2  has a low color temperature. In the PC mode, the microcontroller  240  uses the phase controller  551  to trigger both ACLED 1  and ACLED 2  to conduct for a long period, thereby to generate the high level illumination as well as illumination of mix color temperature. In the PS mode, the microcontroller  240  uses the phase controller  551  to trigger only the ACLED 2  to conduct for a short period, thereby generates the low level illumination as well as illumination of low color temperature. Moreover, in the PS mode, when the motion sensor  230  detects a human motion, the microcontroller  240  may through the phase controller  551  trigger the ACLED 1  and ACLED 2  to conduct for a long period. Thereby, it may render the light-emitting unit  450  to generate the high level illumination of high color temperature and to produce high contrast in illumination and hue, for a short predetermined duration to warn the intruder. Consequently, the lighting apparatus may generate the high level or the low level illumination of different hue. The rest of operation theories associated with the light-emitting unit  550  are essentially the same as the light-emitting unit  450  and further descriptions are therefore omitted. 
     Fourth Exemplary Embodiment 
     Refer to  FIG. 6 , which illustrates a schematic diagram of a two-level LED security light  100  in accordance to the fourth exemplary embodiment of the present disclosure. The light-emitting unit  150  of  FIG. 1  may be implemented by the light-emitting unit  650 , wherein the light-emitting unit  650  includes three ACLED 1 ˜ 3  having identical luminous power as well as switches  651  and  652 . In which, switches  651  and  652  may be relays. The parallel-connected ACLED 1  and ACLED 2  are series-connected to the switch  652  to produce double luminous power, and of which the ACLED 3  is parallel connected to, to generate triple luminous power, and of which an AC power source is further coupled to through the switch  651 . Moreover, the microcontroller  240  implements the loading and power control unit  140  of  FIG. 1 . The pin PC and pin PS are respectively connected to switches  651  and  652  for outputting voltage signals to control the operations of switches  651  and  652  (i.e., open or close). 
     In the PC mode, the pin PC and pin PS of the microcontroller  240  control the switches  651  and  652  to be closed at same time. Consequently, the ACLED 1 ˜ 3  are coupled to the AC power source and the light-emitting unit  650  may generate a high level illumination of triple luminous power. After a short predetermined duration, the microcontroller  240  returns to PS mode. In which the switch  651  is closed while the pin PS controls the switch  652  to be opened, consequently, only the ACLED 3  is connected to AC power source, and the light-emitting unit  650  may thus generate the low level illumination of one luminous power. In the PS mode, when the motion sensor  230  detects a human motion, the microcontroller  240  temporarily closes the switch  652  to generate high level illumination with triple luminous power for a predetermined duration. After the predetermined duration, the switch  652  returns to open status thereby to generate the low level illumination of one luminous power. The lighting apparatus of  FIG. 6  may therefore through controlling switches  651  and  652  generate two level illuminations with illumination contrast of at least 3 to 1. 
     The ACLED 1  and ACLED 2  of  FIG. 6  may be high power lighting sources having a color temperature in a range between 4000K and 6500K. The ACLED 3  may be a low power lighting source having a color temperature between 2000K and 3000K. Consequently, the ACLED may generate two levels of illuminations with high illumination and hue contrast without using a zero-crossing detection circuit. 
     Fifth Exemplary Embodiment 
     Refer to  FIG. 7 , which illustrates a schematic diagram of a two-level LED security light in accordance to the fifth exemplary embodiment of the present disclosure. The light-emitting unit  750  of  FIG. 7  is different from the light-emitting unit  640  of  FIG. 6  in that the ACLED 3  is series-connected to a circuit with a rectified diode D and a switch  753  parallel-connected together, and of which is further coupled through a switch  751  to AC power source. When the switch  753  closes, the AC electric current that passes through the ACLED 3  may be a full sinusoidal waveform. When the switch  753  opens, the rectified diode rectifies the AC power, thus only one half cycle of the AC electric current may pass through the ACLED, consequently the luminous power of ALCED 3  is cut to be half. 
     The pin PS of the microcontroller  240  synchronously controls the operations of switches  752  and  753 . If the three ACLED 1 ˜ 3  have identical luminous power, then in the PC mode, the pin PC and pin PS of the microcontroller  240  synchronously close the switches  751 ˜ 753  to render ACLED 1 ˜ 3  illuminating, thus the light-emitting unit  750  generates a high level illumination which is three-times higher than the luminous power of a single ACLED. When in the PS mode, the microcontroller  240  closes the switch  751  while opens switches  752  and  753 . At this moment, only the ACLED 3  illuminates and as the AC power source is rectified by the rectified diode D, thus the luminous power of ACLED 3  is half of the AC power source prior to the rectification. The luminous power ratio between the high level and the low level illuminations is therefore 6 to 1. Consequently, strong illumination contrast may be generated to effectively warn the intruder. 
     It should be noted that the light-emitting unit in the fifth exemplary embodiment is not limited to utilizing ACLEDs. In other words, the light-emitting unit may include any AC lighting sources such as ACLEDs, incandescent lamps, or fluorescent lamps. 
     A lighting apparatus may be implemented by integrating a plurality of LEDs with a microcontroller and various types of sensor components in the controlling circuit in accordance to the above described five exemplary embodiments. This lighting apparatus may automatically generate high level illumination when the ambient light detected is insufficient and time-switch to the low level illumination. In addition, when a person is entering the predetermined detection zone, the lighting apparatus may switch from the low level illumination to the high level illumination, to provide the person with sufficient illumination or to generate strong illumination and hue contrast for monitoring the intruder. 
     When the light source of the light-emitting unit  150  is confined to the use of an LED load, the compliance and satisfaction of a voltage operating constraint attributable to the unique electrical characteristics of the LED load is vital to a successful performance of an LED lighting device. Any LED lighting device failing to comply with the voltage operating constraint of the unique electrical characteristics is bound to become a trouble art. This is because the LED as a kind of solid state light source has completely different electrical characteristics for performing light emission compared with conventional light source such as incandescent bulbs or fluorescent bulbs. For instance, for a white light LED or blue light LED there exists a very narrow voltage domain ranging from a threshold voltage at around 2.5 volts to a maximum operating voltage at around 3.5 volts, which allows the LEDs to operate adequately and safely; in other words, when a forward voltage imposed on the LED is lower than the threshold voltage, the LED is not conducted and therefore no light is emitted, when the forward voltage exceeds the maximum operating voltage, the heat generated by a forward current could start damaging the construction of the LED. Therefore, the forward voltage imposed on the LED is required to operate between the threshold voltage and the maximum operating voltage. 
     In respect to the LED load of the light-emitting unit  150 , the cut-in voltage V t  of ACLEDs is technically also referred to as the threshold voltage attributable to PN junctions manufactured in LEDs. More specifically, the LED is made with a PN junction semiconductor structure inherently featured with three unique electrical characteristics, the first characteristic is one-way electric conduction through the PN junction fabricated in the LED, the second electrical characteristic is a threshold voltage V th  required to trigger the LED to start emitting light and the third electrical characteristic is a maximum operating voltage V max  allowed to impose on the LED to avoid a thermal runaway to damage or burn out the semiconductor construction of the LED. The described cut-in voltage V t  has the same meaning as the above mentioned threshold voltage V th  which is a more general term to be used for describing the second electrical characteristic of a PN junction semiconductor structure. Also because the cut-in voltage V t  is specifically tied to forming a formula to transform the threshold voltage into a corresponding time phase of AC power for lighting control, it is necessary to use the term V th  as a neutral word for describing the LED electrical characteristics to avoid being confused with the specific application for ACLED alone. Additionally, it is to be clarified that the term Vm is related to the amplitude of the instant maximum voltage of an AC power source which has nothing to do with the third electrical characteristic V max  of an LED load. 
     An LED chip is a small piece of semiconductor material with at least one LED manufactured inside the semiconductor material. A plurality of LEDs may be manufactured and packaged inside an LED chip for different levels of wattage specification to meet different illumination need. The LED can also be designed with a larger size of PN junction such that a higher forward current can be generated for higher wattage applications without damaging the LED structure but in such case less quantity of LEDs can be produced. For each LED designed with a different level of wattage specification there always exists a narrow voltage domain V th &lt;V&lt;V max , wherein V is a voltage across each LED, wherein V th  is the threshold voltage to enable the LED to start emitting light and V max  is the maximum operating voltage imposed on the LED to avoid the LED from being damaged or burned out by the heat generated by the high operating voltage at V max . Such voltage constraints are attributable to the different semiconductor materials used, different manufacturing and packaging processes employed. Although the values of threshold voltage and maximum operating voltage may vary within a narrow dispersion of distribution among LEDs produced from different manufacturers, they can be represented by some reference values which are learned from cumulation of manufacturing and practicing experiences by the LED manufacturers. The reference values are necessary and useful to serve as guidelines for designing LED driver to ensure an LED voltage bin selected does comply with the narrow voltage domain V th &lt;V&lt;V max  for generating a constant forward current to produce a designated light intensity. 
     LEDs are batch-produced by wafers and each wafer is designed to produce a large quantity of LEDs which may respectively require different forward voltages within a narrow distribution range for generating a designated forward current. For instance if a batch of #2835 0.5 watt LEDs are used to generate a designated forward current at 150 mA, among the batch of LEDs produced from the same manufacturer, there exists a distribution range of required forward voltages from 2.9 volts (Minimum Forward Voltage, VFMIN) to 3.3 volts (Maximum Forward Voltage, VFMAX) to generate the same designated forward current, the batch of LEDs is further divided and grouped by the manufacturer into a few voltage bins with each voltage bin having a much smaller subrange of forward voltages bounded by a bin minimum forward voltage VBMIN and a bin maximum forward voltage VBMAX for generating the same forward current. For instance the distribution range may be divided into four voltage bins with a first bin accommodating a forward voltage subrange from 2.9 volts to 3.0 volts, a second voltage bin accommodating a forward voltage subrange from 3.0 volts to 3.1 volts, a third bin accommodating a forward voltage subrange from 3.1 volts to 3.2 volts, and a fourth bin accommodating a forward voltage subrange from 3.2 volts to 3.3 volts. The LEDs grouped in the first bin belong to the most efficient LEDs produced from the wafer as they only need lowest forward voltages to generate same designated forward current, then followed by the second bin, then followed by the third bin and then the fourth bin being the least efficient LEDs produced by the wafer as they need highest forward voltages to generate same forward current. LED manufacturers sell LEDs by voltage bins with each voltage bin containing a plurality of LEDs which requires different forward voltages to generate a designated forward current for emitting light. Such division of LEDs by voltage bins is necessitated in order to minimize a volatility of forward voltages for generating a designated constant forward current. Otherwise a large swing of forward voltages between the maximum forward voltage VFMAX and the minimum forward voltage VFMIN could easily cause an LED load fail because the VFMAX required for driving the least efficient LED(s) could be too close to or exceeding the maximum operating voltage V max , which could cause the LED load damaged or burned out since all LEDs are electrically connected in series. In others words without the division of forward voltages by voltage bins it would be difficult to comply with the constraints of V th &lt;V&lt;V max . Similar bin arrangements are also applicable to color temperature performance and brightness performance for LEDs produced from a wafer. Generally speaking LED voltage bins with lower forward voltages can be priced higher than LED voltage bins with higher forward voltages. Both the minimum forward voltage VBMIN and the maximum forward voltage VBMAX in each voltage bin selected are required to comply with voltage operating constraint V th &lt;V&lt;V max , wherein V is a variable of forward voltage in the subrange of the voltage bin selected, wherein V th  is a reference value of a threshold voltage required to trigger each LED in the batch of LEDs produced from the manufacturer to emit light and V max  is a reference value of a maximum operating voltage across each LED in the batch of LEDs from the manufacturer at which the LED is vulnerable to a thermal damage. Please notice VBMIN and VBMAX respectively represent the lowest forward voltage and the highest forward voltage among the batch of LEDs for a selected voltage bin produced by the LED manufacturer to generate a designated constant forward current for outputting a designated lumens whereas the threshold voltage V th  and the maximum operating voltage V max  respectively refer to a minimum forward voltage to trigger any LED to start generating a forward current and a maximum forward voltage at which the LED is possibly vulnerable to a thermal damage. 
     When an LED load of an LED lighting device is configured with a plurality of N pieces of LEDs electrically connected in series or N sets of in parallel connected LEDs electrically connected in series, a working voltage V N  imposed on the LED load is therefore required to be in a range between N×V th  and N×V max , namely, N×V th &lt;V N &lt;N×V max . 
     When the plurality of LEDs are white light LEDs produced by coating at least one phosphor compound on surfaces of blue light LEDs, a reference value of the threshold voltage V th  is estimated at 2.5 volts and a reference value of the maximum operating voltage V max  is estimated at 3.5 volts subject to an operating condition that a temperature of each LED connecting pin is controlled at or below 80 degrees centigrade thru an adequate design of a heat sink, therefore the voltage V across each LED of the N pieces of LEDs is thereby required to comply with an operating constraint of 2.5 volts&lt;V&lt;3.5 volts and the working voltage V N  imposed on the LED load is thereby confined in a domain expressed by N×2.5 volts&lt;V N &lt;N×3.5 volts. 
     For any LED lighting device comprising an LED load it is required that the LED load in conjunction with an adequate level of power source is configured with a combination of in series and/or in parallel connections of LEDs such that the electric current passing through each LED of the LED load remains at an adequate level such that a voltage V across each LED complies with the voltage operating constraint of V th &lt;V&lt;V max  featuring electrical characteristics of the LED and the working voltage V N  across the LED load configured with N number of LEDs connected in series complies with an operating constraint of N× V th &lt;V N &lt;N×V max . 
       FIGS. 8A, 8B, 8C and 8D  comprises 4 drawings schematically and respectively showing a I-V relationship chart (Forward Current vs. Forward Voltage) for a #2835 0.5 watt white light LED from each of 4 different LED manufacturers; as can be seen from the chart when a forward voltage V is below a threshold voltage at around 2.5 volts, the LED is essentially not conducted so a forward current I is essentially equal to zero, as the forward voltage exceeds 2.5 volts the LED is activated to generate a current flow to emit light, as the forward voltage continues to increase, the forward current I increases exponentially at an accelerated pace, at a maximum forward voltage at around 3.5 volts the forward current I becomes 250 mA or higher, which could generate a heat that could start damaging the PN junction of the LED (Cree J Series 2835 LEDs). While an LED can be designed with a larger PN junction for operating a higher level of forward current for generating a higher lumens output, it is to be noticed the operating constraint of forward voltage has little to do with the dimensions of PN junction designed, therefore V th &lt;V&lt;V max  remains effective and necessary as such forward voltage constraint is attributable to the materials used in making the phosphor based white light LED. Although an LED is a current driven light emitter, it is to be recognized that ultimately it is the voltage that generates the current flow to drive the LED to emit light, no voltage no light emission so to speak. As shown in the I-V relationship chart, when the forward voltage is increased from 2.5 volts to 3.5 volts for the Cree 2835 LED, the corresponding forward current is substantially increased from 0 to 250 mA. Such feature of a high performance leverage of a large variation of forward current against a small variation of forward voltage makes it inappropriate to use a voltage as a variable to accurately control lumens output of an LED load. Instead it is more appropriate to use and to vary the constant current to operate the LED load. There are at least two reasons which support the use of the constant current source for operating the LED load: first, when a forward voltage varies by a 5% tolerance the forward current could vary in multiple like 40% to 50% for example. This could cause some LED(s) damaged in the LED load since we all know the LEDs from the same wafer have different forward voltages for generating same forward current; second, when the forward voltage varies a 5% tolerance the forward current could vary in multiple to result into a 40% to 50% fluctuation in light intensity which obviously cannot be accepted by consumers. A constant current source is always configured with a voltage power source to work in conjunction with a constant current control circuit which comprises a feedback circuit to provide a current information to the controller of the voltage power source for continuously adjusting output voltage level such that the current is kept constant. 
     In the semiconductor industry including the LED, the values of electrical parameters which characterize the natural inherent properties of semiconductor materials often are not precise or fixed, they always come with a range of distribution with a narrow dispersion, namely a reference range. For semiconductor devices in different categories of applications such as silicon based diode versus compound semiconductors based LED such as GaAs or GaP, their respective values of electrical parameters have very different distribution ranges though they all have the common features of having to operate in a conduction period between different threshold voltages and different maximum operating voltages. For semiconductor devices in the same category of application, the values are also different among different manufacturers though the variation ranges are much smaller and more predictable. Even the same white light LEDs produced from the same wafer there still exists a small yet predictable variation range of distribution as disclosed in the above descriptions for Cree 2835 LED about the structure of the LED voltage bins. They are just the natural inherent properties of semiconductor materials that the electrical parameters of semiconductor materials are impossibly represented by fixed values instead they always come with ranges of probability distribution with a narrow dispersion. With the above explanations being disclosed it is necessary to interpret or define the threshold voltage being a narrow interval comprised of a reference value plus a small tolerance e.g. 5% to 10%, or the reference ranges, therefore the reference value of threshold voltage at 2.5 volts with 5% tolerance would mean 2.5 volts+5%×2.5 volts=2.625 volts and the reference value of maximum operating voltage at 3.5 volts would mean 3.5 volts−5%×3.5 volts=3.325 volts, therefore the forward voltage V is interpretably operated as 2.5 volts&lt;2.625 volts&lt;V&lt;3.325 volts&lt;3.5 volts. 
       FIG. 9  is a data sheet showing data of the minimum forward voltages and maximum forward voltages for generating a designated forward current for LEDs produced from various LED manufacturers. They are the variation ranges of forward voltages formed by pairs of Maximum Forward Voltage and Minimum Forward Voltage of LEDs manufactured by different manufacturers before being divided and grouped into different voltage bins. Such variation ranges formed by each VFMAX and VFMIN are also required to satisfy the operating formula 2.5 volts&lt;V&lt;3.5 volts. 
     In summary, the compliance of voltage operating constraint V th &lt;V&lt;V max  featuring electrical characteristics of an LED is a critical technology for ensuring a normal performance of the LED load. Failing to comply with such voltage operating constraint can quickly age or seriously damage the semiconductor structure of the LED with a consequence of quick lumens depreciation of the LED bulbs and the product lifetime being substantially shortened, which will be unacceptable to the consumers. The compliance of the operating constraint V th &lt;V&lt;V max  is a necessary matter for any LED lighting device though it is not an obvious matter as it requires complicated technologies to calculate and coordinate among an adequate level of power source, a control circuitry and a non-linear I-V relationship of light-emitting load. For conventional lighting load such as incandescent bulb there exists no such operating constraint. This is why in the past years there had been many consumers complaining about malfunction of LED bulbs that the consumers were frustrated with the fast depreciation of lumens output and substantially shortened product lifetime of the LED bulbs purchased and used. A good example was a law suit case filed by the Federal Trade Commission on Sep. 7, 2010 (Case No. SACV10-01333 JVS) for a complaint against a leading lighting manufacturer for marketing deceptive LED lamps and making false claims with respect to the life time of their LED lamps and a huge amount of monetary relief was claimed with the Court in the complaint. 
     To further elaborate the importance of the constraints of operating formula V th &lt;V&lt;V max , it is necessary for the applicant to describe the following system operating flow chart to explain how the operating formula plays its indispensable role in LED driver design such that an LED light so designed is always ensured of being operated in a safety range when energized and the LED light can be expected as an energy saving and long lasting light source; 
     System Flowchart for designing an LED driver of an LED Light:
         a) Step 1 Determine a maximum lumens output before a lumens loss by the light diffuser. For example use a maximum lumens L max =3200 lumens.   b) Step 2 Select an LED capable of generating X lumens, e.g. X=80 lumens and then calculate a minimum quantity Q min  of the LEDs for configuring the light emitting unit. Q min =3200/80=40 LEDs.   c) Step 3 Obtain the corresponding value of the forward current I which generates the required lumens (e.g. 80 lumens) from the LED manufacturer&#39;s data pool.   d) Step 4 Select and obtain an LED voltage bin comprising a plurality of LEDs with different forward voltages able to produce same forward current on the I-V relationship curves to generate same lumens output (e.g. 80 lumens). The selected voltage bin comprising a plurality of LEDs with different forward voltages form a bin voltage domain bounded by the minimum forward voltage VBMIN and the maximum forward voltage VBMAX.   e) Step 5 At this stage both the LED manufacturer and the circuit designer of the LED light are obliged to carefully check both VBMIN and VBMAX are in full compliance with the operating constraints of 2.5 volts&lt;V&lt;3.5 volts, wherein V is a variable of forward voltages in the voltage domain bounded by VBMIN and VBMAX, or equivalently V th &lt;VBMIN and V BMAX &lt;V max .
           If V is within the domain between 2.5 volts and 3.5 volts, the selected LED voltage bin is acceptable. If V is outside of the domain then the LED voltage bin selected is not acceptable because the LED light would fail its performance as disclosed in the specification and claims. Under such circumstances either the lumens output level is to be reduced until the corresponding forward voltage falls in the domain or a different LED which can satisfy the voltage operating constraint needs to be selected.   
           f) Step 6 Determine a matrix of in parallel and in series connections of the minimum quantity of LEDs (e.g. 40 LEDs)   g) Step 7 Calculate the voltage and the total wattage required to successfully drive the LED light to perform the maximum lumens output.       

     The present disclosure of a two-level LED security light provides a unique lifestyle lighting solution. The motivation of creating such lifestyle lighting solution has less to do with the energy saving aspect of the low level illumination mode because an LED is already a very energy saving light source compared with the conventional incandescent light source. For instance, a 10-watt LED security light when operated at a low level at 30% illumination it only saves 7 watts, which is not as significant as a 100-watt incandescent bulb which can save as much as 70 watts when operated at 30% illumination for a low level mode. While it is always good to save some extra energy, it is however not the main incentives for developing the present invention; the life-style lighting solution of the present disclosure is featured with two innovations which meaningfully improve the exquisite tastes of living in the evening, the first innovation is the creation of an aesthetic scene for the outdoor living environment, wherein at dusk the LED security light is automatically turned on by the photo sensor to perform the low level illumination which is necessary for creating a soft and aesthetic night scene for the outdoor living area (such soft and aesthetic night view is not achievable by the high level illumination however), the second innovation is the creation of a navigation capacity similar to a light house effect for guiding people to safely move toward a destination in the outdoor living area without getting lost or encountering an accident. These two innovative functions coupled with the motion sensor to increase illumination when people enters into the short detection area make the present invention a perfect lifestyle lighting solution for enjoying an exquisite taste of evening life. 
     The technical infrastructure of a two-level LED security lights for various embodiments as disclosed can be further enhanced and applied to form a linkable LED security lighting system configured with a plurality of member LED security lights by incorporating a wireless transceiver, namely, a device including a wireless transmitter and a wireless receiver, for connecting and communicating with all neighboring member LED security lights to synchronously control on/off, dimming and color temperature tuning performances of all linked member LED security lights. 
     Prior art U.S. Pat. No. 10,271,404 disclosed a hardware based technology for a linked security lighting system established by using an interface including a channel selector switch for selecting a channel to which each lighting unit will be connected. In this way a network can be created by placing the lighting units proximate to each other and selecting the same channel at the interface at each lighting unit. In general, this hardware based technology would be limited in some aspects, such as less flexibility in extending channel number when a vast network connectivity is required. The present disclosure discloses a software based technology for establishing a linkable LED security lighting system using a connectivity APP (software application) designed and loaded in a mobile phone; wherein the connectivity APP is configured with two operating processes, wherein a first operating process is to establish a data base of installed locations for all of said plurality of LED security lights with each of the plurality of LED security lights being assigned a location code for identification and for individual control, wherein a second operating process is a grouping job to divide the plurality of LED security lights into at least one group of linkable LED security lights with each group being assigned a group code applicable to each LED security light in the same group for identification and for synchronously performing same illumination; wherein the connectivity APP is wirelessly connected with each LED security light of the plurality LED security lights for generating, assigning, receiving, setting and recording at least a location code, at least a group code and or at least one universal code to each LED security light of the plurality of LED security lights, wherein the location code, the group code and or the at least one universal code are stored in a memory unit of each LED security light, wherein after the data base of installed locations for the plurality of LED security lights being fully established each LED security light displayed visually on a screen of the mobile device becomes identifiable on the connectivity APP to a user to perform a grouping or re-grouping job. 
     The connectivity APP is a software tool to configure a linkable structure of a plurality of LED security lights of a lighting system installed in an outdoor living space. The connectivity APP involves a necessary process including to assign a location code and a group code for each LED security light installed in the outdoor living space and to key in correspondingly a location code for each LED security light shown on the screen of the connectivity APP. The linkable structure, for instance, represented by a tree map of LED security lights interlinked and displayed visually on the connectivity APP, can be changed by modifying the location codes or the group codes to create new linkable groups of the plurality of LED security lights. Using modifiable location code assigned to each LED security light, the connectivity APP has the advantages to efficiently and almost unlimited establish a linkable LED security lighting system. 
     Specifically, the plurality of LED security lights of the linkable LED security lighting system are divided into N groups of member LED security lights to be linked. Each group of member LED security lights is assigned a location code to be applied to each member LED security light in the group by operating the connectivity APP for identification and communication, such that within the group the member LED security lights are interlinked preferably created via wireless control signals prefixed with a same location code transmitted thru a transceiver in each of the member LED security lights, wherein when a member LED security light first receives a sensing signal for operating an illumination mode, the member LED security light acts as a commanding member LED security light to activate all member LED security lights assigned with the same location code to operate the illumination mode, wherein upon receiving the sensing signal the controller of the commanding member LED security light operates to output a control signal to activate the illumination mode, at the same time the controller manages to wirelessly transmit an instruction signal prefixed with the location code to remotely activate at least one neighboring member LED security light with same location code to synchronously operate the illumination mode as performed by the commanding member LED security light. 
     It is to be noticed that the software based technology disclosed in the present disclosure has at least four advantages over the hardware based technology disclosed in the U.S. Pat. No. 10,271,404. 
     First, the present disclosure allows a user to expand a linking space of N groups unlimitedly at any time while the Prior Art of U.S. Pat. No. 10,271,404 is very much fixed and restricted to a limited number of selections according to a configuration of the channel selector. 
     Second, the connectivity APP of the present disclosure can be designed to enable a cross-group illumination option, wherein the controller of at least one selected security light is designed to be additionally responsive to at least one wireless instruction signal with a different location code transmitted from at least one separate group. 
     Third, the present disclosure can be designed to operate a hybrid linkable security lighting system, wherein the controller is programmed to respond to at least two wireless instruction signals including a first wireless signal with a universal code which can synchronously activate every security light in the lighting system to be turned on at dusk and to be turned off at dawn, and a second wireless signal prefixed with a location code or a group code to synchronously activate the security lights in a linkable group to perform same illumination when a security light in the linkable group first detects a motion signal. 
     Fourth, once a location code has been assigned and set with every security light in the lighting system and the connectivity APP, the user can easily change or modify a grouping arrangement on the connectivity APP without going to each security light for adjusting each channel selector one by one which may require using a ladder for accessing to each security light for performing manual adjustment. 
     Referring to  FIGS. 10A, 10B, 10C and 10D  which illustrate a framework for establishing a linkable security light system in accordance to an exemplary embodiment of the present disclosure. Please refer to  FIG. 10A . A connectivity APP  801  is loaded in a mobile device  800 , for instance, a mobile phone, for configuring a linkable structure of a plurality of LED security lights of a lighting system. The plurality of LED security lights are divided into a plurality of linkable groups  803  with each linkable group G(i) designated by a location code for each security light of G(i) group and a group code  805 . The mobile device is equipped with a transceiver  862 , wherein the transceiver includes a wireless transmitter and a wireless receiver, as shown in  FIG. 10A , for bi-directional communications during configuring the linkable structure when operating the connectivity APP. To enable bi-directional communication, a wireless signal processed by the transceiver comprises a group code to identify a linkable group G(i), a location code to identify a single LED security light to be linked in the linkable group G(i) and an instruction code for executing an operation. The location codes and the group codes of the linkable groups are transmitted via wireless signal thru the transceiver of the mobile device to each LED security light in the linkable group. Please refer to  FIG. 10B . The LED security light  900  is basically composed of a loading and power control unit  940 , a light-emitting unit  950  comprising an LED light load, a plurality of sensors  920 ,  930 , an external control unit  960  including time setting devices  961 , external control devices  963  and a transceiver  962 . The transceiver  962  is further composed of a receiver  9621  and a transmitter  9622 . The loading and power control unit  940  including a controller and a switching circuitry, wherein the controller is preferably a microcontroller with embedded memory unit, wherein the location codes and the group codes transmitted from the connectivity APP are received by the receiver  9621  and memorized by the controller of the LED security light for coding an outgoing wireless signal and verifying an incoming wireless signal thru the transceiver of the LED security light during processing a setting of the location codes and the group codes, as shown in  FIG. 10B , for enabling a linkable operation. Please further refer to  FIG. 10C . The LED security light  901  is basically similar to the LED security light  900  in  FIG. 10B . The only difference is that the LED security light  901  does not have external control devices and time setting devices. All the functional parameters are set thru the connectivity APP of the mobile device  800 . 
     The location codes and the group codes of the linkable structure can be changed or modified by operating the connectivity APP for creating a new linkable structure, and the group belonging of the LED security lights is then changed accordingly. This is a great advantage of the present disclosure when rearranging a tree map of the LED security lights is required, wherein desired linked groups can be easily created and tested on a software basis without resorting to adjusting the installation positions of the LED security lights to be linked. 
     Referring to  FIG. 10D  which illustrates a system block  1000  for establishing a linkable electric apparatuses system.  FIG. 10D  shows a general block  1000  with capability to bi-directionally communicate with a connectivity APP and proximate general blocks of the same type  1000 . The general block  1000  is composed of a loading and power control unit  1040 , an electric load  1050 , a sensing control unit  1030  and an external control unit  1060 . The loading and power control unit  1040  includes a controller and a switching circuitry electrically coupled to the electric load  1050 . The electric load  1050  may be an LED light load, a ceiling fan, or any electric appliance used in house. The external control unit  1060  is designed for adjusting operation parameters of the electric load  1050  and includes at least a time setting device  1061 , a transceiver  1062  and at least an external control device  1063 . The transceiver  1062  of the external control unit  1060  enables thru wireless signals creating a network of different electric apparatuses with different electric load types linkable and programmable by the connectivity APP. 
     Referring to  FIG. 11  in view of  FIG. 10A  and  FIG. 10B  which illustrates a system flow chart for a method for setting a location code or a group code in accordance to an exemplary embodiment of the present disclosure. The method starts with Step 1 to open the connectivity APP on the mobile phone. Then, Step 2 is to divide the plurality of LED security lights in the lighting system into N linkable groups of illumination zone with each linkable group comprising at least two LED security lights to be linked for synchronously performing same illumination options, such as, on/off control, dimming control or color temperature tuning control, triggered by various sensors. The setting of N linkable group is starting from a process index i=0. Step 3 is to turn on all LED security lights in a first linkable group G(i), wherein i=1. Step 4 is thru wireless signal transmitted from a transceiver  862 , as shown in  FIG. 10A , to wirelessly connect the connectivity APP  801  to a first linkable group of selected LED security lights  900 , wherein G(i)=G( 1 ). Step 5 is to display the selected LED security lights in G(i) group to appear on APP control page of a mobile phone. Step 6 is to assign identification codes to the first linkable group of selected LED security lights with each of the selected LED security lights being assigned a location code and a first group code. Step 7 is for transmitting the location code and the first group code thru wireless signal transmitted from the transceiver to each LED security light in the first linkable group G(i), wherein the location code and the first group code are received and memorized by a controller, being a microcontroller  940  as shown in  FIG. 10B , of the LED security light for coding an outgoing wireless signal and verifying an incoming wireless signal for enabling a linkable operation. After completing the setting of the first group code for the first linkable group and after checking the process index i≠N, the process resumes to Step 3 for setting a second group code for a second group of selected LED security lights thru Step 7. The recurring process continues till all N linkable groups and all LED security lights have completed setting of relevant location and group codes for identification and communication. When a plurality of selected LED security lights in a linkable group are interlinked, each LED security light installed at different locations around an outdoor living area can perform both roles of being a commander as well as being a follower to synchronously perform on/off control, dimming control or color temperature tuning control. 
     Referring to  FIG. 12  in view of  FIG. 10A  and  FIG. 10B  in accordance to an exemplary embodiment of the present disclosure which uses a block diagram to briefly illustrate a system dynamic for configuring and operating a linkable LED security lighting system following a completion of setting all location codes for all LED security lights in the system flow chart  FIG. 11 . 
     At dusk when a light sensing control unit  920  of one of the plurality of LED security lights in a linkable group first detects a night time signal (S 121 ), in other words, the ambient light of the operating location detected by the light-sensing control unit being lower than a first predetermined value, the LED security light is responsively switched for operating a low level illumination mode to perform a low level illumination (S 122 ), and at the same time the LED security light acts as a commanding LED security light to activate all LED security lights in the linkable group, each recognizable with same group code of the one of the commanding LED security light, as followers in the lighting system to synchronously operate the low level illumination mode to perform the low level illumination, wherein a controller of the commanding LED security light operates to output a first wireless signal prefixed with a universal code recognizable by the LED security lights in the linkable group, wherein the LED security lights in the linkable group are activated to synchronously operate the low level illumination mode to perform the low level illumination (S 123 ); wherein during a performance of the low level illumination mode when an LED security light in a linkable group first detects a motion signal thru a motion sensor (S 124 ), the LED security light accordingly is switched to a motion sensor mode for operating a high level illumination for a preset time length and then resuming to the low level illumination (S 125 ), and at the same time the LED security light acts as a commanding LED security light to order all linked LED security lights in the linkable group to temporarily switch to activate the motion sensor mode to perform a high level illumination for the preset time length before resuming to the low level illumination mode (S 126 ), wherein the commanding LED security light operates to transmit a second wireless signal coded with a group code of the one of the commanding LED security light thru the transceiver recognizable by the LED security lights assigned with the same group code in the linkable group, wherein the LED security lights in the linkable group are activated synchronously to operate the motion sensor mode. 
     At dawn when a light sensing control unit of an LED security light in the lighting system first detects a daytime signal meaning the ambient light detected by the light sensing control unit being higher than a second predetermined value (S 127 ), the LED security light acts as a commanding LED security light to synchronously deactivate the plurality of LED security lights in the lighting system; wherein the controller of the commanding LED security light operates to stop outputting the first wireless signal and the second wireless signal to turn off the light-emitting units (S 128 ), at the same time the controller of the commanding LED security light operates to generate and transmit thru the transceiver a third wireless signal coded with a universal code to deactivate at least one LED security light to turn off the at least one LED light-emitting unit (S 129 ). 
     The above disclosed embodiments and technologies are able to provide home owners with a 360 degree illumination surrounding a house for a great security protection as all linked member LED security lights can brighten instantly at the same time when a motion intrusion at any spot is detected by one of the plurality of member LED security lights. If the home owner does not need a full surrounding illumination the home owner can simply manage to divide the plurality of member LED security lights into linked group and non-linked group such that a partial surrounding illumination can be performed by the linked group of member LED security lights while the non-linked group of LED security lights simply operate the two-level illumination individually and independently. The technology of connectivity APP is not limited to the application of the linkable outdoor security lighting system working with photo sensor and or motion sensor. In fact, it can also be used to generally replace traditional channel selection switch for remotely controlling individual light or grouped lights among a plurality of lights, or individual ceiling fan or grouped ceiling fans installed in a living space; similar processes may be employed to create a location code, a group code and/or at least one universal code as a communication medium for executing a control decision of a lighting control decision between a connectivity APP designed and loaded in a mobile device such as mobile phone and each of the plurality of lights and or ceiling fans, wherein said location code is used for controlling only one lighting device or one ceiling fan, wherein said group code is used for controlling all lighting devices or ceiling fans in the same group, wherein said at least one universal code is used for controlling all lighting devices or ceiling fans. 
     Referring again to  FIG. 11  in view of  FIG. 10A  and  FIG. 10B  which illustrates a system flow chart for a method for setting a location code and a group code in accordance to an exemplary embodiment of the present disclosure. The method starts with Step 1 to open the connectivity APP on the mobile phone. Then, Step 2 is to divide the plurality of LED security lights or ceiling fans in the lighting and/or ceiling system into N linkable groups of operating zone with each linkable group comprising at least one member LED light, at least one ceiling fan or both to be individually operating a performance or to be linked for synchronously performing same illumination options, such as, on/off control, dimming control or speed control. The setting of N linkable group is started from a process index i=0. Step 3 is to turn on the at least one LED light or at least one ceiling fan in a first round selection, wherein i=1. Step 4 is thru wireless signal transmitted from a transceiver of the mobile phone to wirelessly connect the connectivity APP to the first round selection of the at least one LED light or the at least one ceiling fan, wherein G(i)=G( 1 ). Step 5 is to display the at least one LED light or the at least one ceiling fan to appear on APP control page of the mobile phone. Step 6 is to assign a location code and a first group code to the first round selection of the at least one LED light or the at least one ceiling fan with the at least one LED light or the at least one ceiling fan being assigned the first group code. Step 7 is for transmitting the first group code thru wireless signal transmitted from the transceiver to the at least one LED light or the at least one ceiling fan in the first round selection, wherein the first group code is received and memorized by a controller, being a microcontroller shown in  FIG. 10B , of the at least one LED light or the at least one ceiling fan for coding an outgoing wireless signal and verifying an incoming wireless signal for enabling an individual or a linkable synchronous performance. After completing the setting of the first group code for the first round selection and after checking the process index i≠N, the process resumes to Step 3 for setting a second group code for a second round selection of at least one LED light or at least one ceiling fan thru Step 7. The recurring process continues till all N groups and all LED lights or all ceiling fans have completed settings of relevant location codes for identification and communication. When a plurality of selected member LED lights or member ceiling fans in a linkable group are interlinked, each member LED light or each member ceiling fan installed at different locations around a living area can perform both roles of being a commander as well as being a follower to synchronously perform on/off control, dimming control, speed control or color temperature tuning control. 
     When each linkable item of said plurality of lights or ceiling fans is designed with a transmittable item code to identify itself, each linkable item may become identifiable by its unique item code on the connectivity APP when connected, a software can be further developed to make each linkable item further controllable on a screen of the connectivity APP. However, it is still missing a location information for each linkable item and therefore a user is still not able to meaningfully make use of such information on the screen of the connectivity APP. A satellite positioned system, such as GPS with map, may be employed to generate a location information for each linkable item shown on the screen of the connectivity APP such that a user can respectively control a functional performance of each linkable item on the connectivity APP. However, it is to be noticed that people tends to control illumination performance in a living space by area not item by item. Therefore, the same process as the above described is still needed and the connectivity APP can be designed with a capacity to divide the plurality of lights or ceiling fans into different linked groups to be respectively assigned a group code. The user may touch on a touch panel displaying the connectivity APP to select the lights or ceiling fans to be linked in each group and push a setting button to wirelessly assign a unique group code to each member light or member ceiling fan in the same group to synchronously operate same illumination performance. 
     The above mentioned descriptions represent merely the exemplary embodiment of the present disclosure, without any intention to limit the scope of the present disclosure thereto. Various equivalent changes, alternations or modifications based on the claims of present disclosure are all consequently viewed as being embraced by the scope of the present disclosure.