Lighting consumes about 30% of the energy used within commercial office space and about 10% of the energy used in a residential environment. Through conscientious design of the lighting systems, the lighting load can be significantly reduced within both environments. These estimates can vary significantly because buildings vary significantly in shape and size as well as function. Also, the behaviour of the building occupants and the nature in which the building is operated can significantly affect the lighting load. Additionally, the more inefficient a building is, the greater the potential to accrue savings.
Reference:
Osburn, L. 2010. Lighting. Green Building Handbook South Africa: The Essential Guide, Volume 2
