Lighting systems will influence the indoor visual comfort and the work productivity. The use of glass curtain walls in high-rise buildings modifies the building outlook and transmits more daylight to reduce the electricity load for illumination. However, this could lead to light pollution in the urban area when the glazing reflects direct sunlight within the urban area. Consequently, pedestrians will suffer from the light pollution. In addition, the energy demand for cooling will significantly increase with a large glazing ratio. The high density of high-rise buildings in urban areas affects the indoor daylight level of the lower floors. Wang et al. (2012) conducted a questionnaire survey in residential buildings in China. It was revealed that, in general, the people living in the higher levels (above the 18th floor) feel that their rooms are brighter.

People have a right to have access to daylight in a building according to the property laws, so reasonable planning is very important for the construction of high-rise buildings to confirm a good natural light visual environment for lower floor residents (Gou et al. 2010). Apart from reasonable landscape planning, artificial light systems should also be applied to supply additional luminosity when natural lighting is not sufficient.

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