LED light sources will make it possible to dial the up your preferred color mix. Want to wake up to a reddish tinge? No problem. If the cost trend for LED light sources continues then the days of incandescent and flourescent bulbs are numbered:
The best white LEDs on the market emit 25 lm/W, which is almost twice as efficient as an equivalent tungsten-filament light bulb, but barely a third as good as a fluorescent tube. To become competitive, the devices need to reach 80 lm/W. To rule the world, 150 lm/W is probably required. If progress continues at the rate of the past 30 years, this will be reached by 2010. That is a big if, but the efficiency of blue and UVLEDs should improve dramatically as better ways are found to build them.
|Share |||Randall Parker, 2002 October 09 10:11 AM Materials Advances|