Good lighting aims at illuminating the task effectively and the general surroundings appropriately. Good lighting design enhances architecture but energy-efficient lighting design enhances both the design and the performance of building. Energy-efficient lighting design focuses on methods and materials that improve both quality and efficiency of lighting. A good lighting design should be able to provide desired quantity and quality of light at minimum energy consumption. Lighting contributes to significant energy consumption in buildings. In air conditioned buildings lighting energy consumption may be as high as 20-25% of total energy consumed, whereas in non-air conditioned buildings, share of lighting energy consumption may be as high as 60% of net energy consumption. Hence it is important to design and operate lighting systems efficiently.

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