ABSTRACT
Since the development of the £rst electric lamp based on principles of a black body radiator by –omas Edison (and independently by Joseph Swan) in 1879, the three traditional light sources, viz., incandescent lamps, compact ¬uorescent lamps (CFLs), and high-intensity discharge (HID) lamps, have evolved to the crest of their performance levels. Currently, any possible incremental improvement in the e¶- ciency of these sources is insu¶cient to ful£ll the growing energy demand and consumption; hence the development of new alternatives for lightening is imminent. In this regard, solid-state lighting technology, such as light-emitting diodes (LEDs) based on semiconductor material, has the potential to achieve a signi£cant enhancement over today’s most e¶cient lighting sources.
