COMPARATIVE STUDY OF LIFE CYCLE COST OF MODERN LIGHT SOURCES USED IN DOMESTIC LIGHTING

The energy crisis problem is the biggest problem faced by the developing countries nowadays. Lighting constitutes a major segment of energy consumption in the building sector whether domestic or industrial. Artificial illumination typically accounts for 40 % of the total energy consumption of domestic buildings. This article discusses a method to optimise the existing lighting system by replacement of high-power consumption lamps with energy efficient lamps by estimating and comparing their life cycle costs. The paper presents a life cycle assessment of different lighting technologies like incandescent lamps, compact fluorescent lamps (CFL) and Light Emitting Diode (LED) luminaries for the general lighting of the office or homes. The life cycle assessments are carried out considering various factors of the luminaries keeping the luminous flux constant as to achieve the same light output. Burning hours of the lamp is considered as main factor to obtain the life cycle costs.