Predicting energy saving and life-cycle cost analysis for lighting and daylighting schemes

Energy-efficient lighting installations, together with dimming controls, can make a good contribution to building energy conservation. Energy-efficient lamp fittings provide high light-output values with less power consumption, and electronic circuitry is more efficient than conventional ballasts. Dimming controls can lower lamp output to save energy when illuminance from daylight and light fittings exceeds the target value. This article studies lighting energy consumption and cost analysis when such lighting schemes are used. The findings would be useful for planning green and sustainable energy schemes and applicable to other spaces with similar architectural layouts and lighting control systems.