Patent ID: 9398652
Filing Date: 2016-07-19
CPC Classification: H05B,Y02B

Claim Text:
1. A control method for a light color of a lighting device, comprising steps of: step 1: providing a lighting device, the lighting device comprising a light emitting unit comprising a plurality of light emitting diodes (LEDs), a rectifier electrically connected to a city power and controlled by an external switch whether to obtain an external power from the city power to output a high voltage direct current, a power converting circuit electrically connected to the rectifier, a city power detecting unit electrically connected between the external power and the rectifier, and a microprocessor unit electrically connected between the power converting circuit and the light emitting unit; step 2: turning on the external switch, to cause the power converting circuit to receive the high voltage direct current and to perform a power conversion to output an operating voltage and a driving voltage, the microprocessor unit receiving the operating voltage and becoming turned on to send a color control signal, and the light emitting unit receiving the color control signal and then emitting a white light; step 3: turning off the external switch for a first interval and again turning on the external switch; step 4: performing a first identification procedure by the microprocessor unit that determines that the first interval is shorter than a first predetermined period and then sending a plurality of first color control signals to the light emitting unit according to a timing sequence, and the light emitting unit receiving the first color control signals and then emitting a plurality of different light colors Cn, wherein there are n light colors Cn and n is a parameter associated with a resolution; step 5: turning off the external switch for a second interval when the light emitting unit sends the light color Ci, and again turning on the external switch; and step 6: performing a second identification procedure by the microprocessor unit that determines that the second interval is shorter than a second predetermined period, and then sending a second color control signal to the light emitting unit, and the light emitting unit receiving the second color control signal and then emitting a color light corresponding to the light color Ci, where Ci is a light color emitted at an ith timing sequence.