Here's a little excerpt from an article running today on EcoGeek:
"Using a nano-crystaline coating, scientists at Bilkent University in Ankara, Turkey have created an LED that produces attractive white light while wasting next-to-no electricity . For every watt of light produced, about 300 lumens are visible to the human eye. Fluorescents produce about 80 lumens per watt, and other white LEDs are closer to 60. 300 lumens per watt is two times more visible light per watt of radiation than I've ever heard of for any light source, and they've done it with natural-looking light."
Read the rest of the article here.