

Scientist hope to put LEDs to work in brilliant new ways












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RE: home light
By Haven Bartton on 12/17/2007 3:29:30 PM , Rating: 2
I've never quite understood this myself. As I was taught, sunlight is far "bluer" than our normal indoor lighting. Isn't is the difference of 5400K and 7200K? We went over this in film school, but I can't recall the exact numbers.

Shouldn't these LEDs just be better mimicking sunlight?

RE: home light
By masher2 (blog) on 12/18/2007 3:32:32 PM , Rating: 2
The issue with LED's isn't the amount of "blueness", but rather the fact that "white" LEDs don't really emit white light at all. The most common sort use phosphors to generate two different frequencies of monochromatic light, which our eye perceives as white. Despite that, the light is deficient in all the other frequencies, which typically makes for poor lighting.

RE: home light
By mindless1 on 12/23/2007 10:24:50 PM , Rating: 2
LEDs come in different color temp even for the same "white" part. The highest efficiency tend to be a more blue color, since blue is the actual light produced then (usually) a yellowish phosphrous coating converts to other spectrum. The conversion isn't 100% efficient so the further from blue it drifts, the more light is lost.

