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Lighting is an indispensable energy end use of man. A significant number people in developing countries live\udwithout electric lighting and depend on oil-based lamps. Globally, lighting consumes substantial amount of\udenergy and is a major contributor to green house emissions. Conventional electric lighting systems such as\udincandescent lamps are highly inefficient and waste energy while the fluorescent/CFL lamps contain toxic\udchemicals like mercury. Incandescent lamps with short lifespan as well as the fluorescent/CFL lamps pose\udenvironmental waste disposal problems (e.g.). The use of renewable energy resource such as solar and wind\udpower systems for example as sources of power for the most efficient and long life lighting source such as\udhigh-brightness light emitting diodes (LEDs) (also known as solid state lighting) would reduce global energy\udconsumption for lighting by half, with corresponding reduction in green house emissions. In developing\udcountries solar powered solid state lighting (SPSSL) would ensure access to electric lighting by the disperse\udpopulation who may not be connected to the national grid in the near feature. In this article we elaborately\udreview the upcoming solid state lighting technology. The physics and principles of operation of LEDs are also\udreviewed. The impact of this new lighting technology on developing countries in the areas of commerce,\udeducation, health and environmental impacts in comparison to conventional lighting technologies is the main\udthrust of this review

A Review of Solid State White Light Emitting Diode and Its Potentials for Replacing Conventional Lighting Technologies in Developing Countries