wide-scale use and large energy savings. During the last
hundred years, electric lighting sources have gone through a
series of technology transition that from early carbon filament
lamps to the ever present tungsten filament incandescent lamps
to the use of plasma discharge sources such as the fluorescent
lamp or pressure sodium vapour (PSV). LED lighting also
called solid state lighting (SSL) is a new light source concept
which offers different operating characteristics to the market.