2.2. Passive Lighting SystemIn the second place, the passive lighting system detaches the dependence of energy. Along with the utilization of sunlight, the indoor lighting can be achieved via the collection of the sunlight and the reflection of the daylight (Fang et al., 2018).Although it is true that some of the passive lighting systems are designed with non-moving and static systems, the modern design utilizes the mechanical mechanisms in optimizing the use of the light from the sun (Guan et al., 2014).