2.1. Low Energy Lighting SystemIn the first place, with reference to the general definition of the low energy lighting system, it is referred as the light fitting that uses low energy light units so that the required energy can be suppressed. Generally, two types of low energy lighting equipment, namely, light-emitting diode (LED) and compact fluorescent bulbs, can be seen in the market (Jae-Hyun, 1930). Although it is advisable to replace all lighting equipment with low energy lighting system, the constraints of the installation and application may exclude the low energy lighting system. For instance, most of the LEDs require low current, while they are unable to dim so that it would be excluded from a certain application (ADAP Solutions Ltd., 2019). Otherwise, the special designed equipment and dimmers are required to enable the control of the brightness and the change of colour tone.