| Semiconductor light emitting diodes (LEDs) are finally on the verge of having the capability to radically alter the entire lighting landscape with staggering improvements in both lighting efficiency and efficacy. LEDs have already achieved 100 lumens per watt, with 200 visible. Incandescent bulbs yield some 15 lumens a watt, CFLs about 80. LEDs last 50,000, and soon 100,000, hours. |