## 3 The Proposed IoT-Based Master-Slave Regionalized Intelligent LED Light-Controlling System
### Preliminaries
\begin{table}
\begin{tabular}{c c c} \hline
**Related Work** & **Philips Hue Smart Lighting Bulb** & **This Work** \\ \hline Applicable Fields & Private areas such as living rooms or rooms & Public regions such as parking lots or corridors \\ \hline PIR Sensor Adoption & No & Yes \\ \hline IoT-Based & Yes & Yes \\ \hline Power Consumption & 10 W & 14 W \\ \hline Dimming & Freely dimmable & Executing in low-light mode when no one is (brightness can be adjusted). \\ \hline Situational Lighting & It can be changed in full color according to the situation. & No \\ \hline Regional Chain Response & No & LEDs in the same region can be brightened at the same time. \\ \hline Price & NT§1900 (About US§667.9) & NT§600 (About US§21.4) \\ \hline \end{tabular}
\end{table} 
Table 2: A comparison of Philips hue smart lighting full-color situational 10 W bulb [48] with this work. \begin{table}
\begin{tabular}{c c c c} \hline
**No.** & **Feature** & **This Work** & **[1]** \\ \hline \multirow{3}{*}{1} & Large-scale intelligent LED lighting system & It can be easily implemented and installed & It can only be installed & It can only be installed individually. Additional wiring and setting up a server can be completed without a connection function. Otherwise, it will only be similar to a general sensor light.  
\begin{tabular}{c c c} \hline
**No.** & **Feature** & **This Work** & **[1]** \\ \hline \multirow{3}{*}{1} & Large-scale intelligent LED lighting system & It can be easily implemented and installed & It can only be installed & It can only be installed individually. Additional wiring and setting up a server can be completed without a connection function. Otherwise, it will only be similar to a general sensor light.  
\begin{tabular}{c c c c} \hline
**No.** & **Feature** & **This Work** & **[1]** \\ \hline \multirow{3}{*}{1} & Large-scale intelligent LED lighting system & It can be easily implemented and installed & It can only be installed & It can only be installed individually. Additional wiring and setting up a server can be completed without a connection function. Otherwise, it will only be similar to a general sensor light.  
\begin{tabular}{c c c c} \hline
**1** & **Large-scale intelligent LED lighting system** & It can be easily implemented and installed & It can only be installed & It can only be installed individually. Additional wiring and setting up a server can be completed without a connection function. Otherwise, it will only be similar to a general sensor light.  
\begin{tabular}{c c c c} \hline
**2** & **Regional synchronization** & Yes & No \\ \hline
**3** & **IoT-based** & Yes & No \\ \hline \end{tabular}
\end{table} 
Table 3: The difference comparison between this work and [1]. 1. This work can make the sensor lights in the same area high- or low-light simultaneously. Hence, it can efficiently complete the energy-saving and convenient control functions of the large-scale intelligent LED lighting system. Ref [1] does not have this function. 2. This work can implement a large-scale intelligent LED lighting system without wiring or setting up a server. Hence, it can achieve the energy-saving purpose of an intelligent LED lighting system. Still, it is only one-tenth of the cost and [1] can be installed individually, with no connection function. 3. For large-scale fields, this work can also directly set the parameters of LED lights through the IoT and use the Wi-Fi 2.4 G wireless transmission modules to uniformly set each LED light according to large-scale field parameter settings, while [1] has no IoT-based connection function. 4. This work has a Master-Slave mode control method. After the Master LED light receives the command information from the cloud, it will immediately transmit the command to other slave LED lights through Wi-Fi 2.4 G wireless transmission, so it belongs to the same zone. Thus, the parameters of the LED lights can be easily set together instead of individually. However, [1] has no master-slave function. 5. This work is suitable for large fields, while [1] is ideal for small fields.