GreenPLS Historical Summary

Thomas Edison in 1879 introduced an incredible invention that changed households throughout the country—the incandescent light bulb. That early light bulb had 16 watts and 1500 hours of use. Twenty three years after Edison’s breakthrough ilight bulbnvention, the first Light Emitting Diodes lights were formulated but there were too many limitations associated the lights to make production economically feasible. The British in the 1950’s were able to make improvements but there were still too many limitations namely because the LEDs were able to produce only red, green and blue colors. LEDs that were able to project white light were not formulated for general usage until 2003.

LED lighting products are based on different principals from traditional lighting which uses filaments, gases or vacuum. LEDs are composed of simple semiconductor chips with narrow wave length bands. These semiconductor chips emit visible colored lights when an electric current is applied. The LEDs are often referred as solid state devices emitting light from a single solid component. This attribute distinguishes LEDs from the filaments, gas tubes or vacuums of traditional light bulbs.