Things that I didn’t know about LED light bulbs
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by philg

Saturday, November 24, 2012 at 06:47 AM EST

I got hold of LED Lighting: A Primer to Lighting the Future and learned a bunch of stuff that I didn’t know about LED light bulbs.

Many of the bulbs sold are not lighting the room via LED. The LED blasts a phosphor with a harsh narrow spectrum of (fairly blue) radiation and then the phosphor re-radiates a broader spectrum. Partly this is because the phosphor radiates more broadly than an LED and partly this is because it enables all of the electricity-to-light conversion to be done by a blue LED. A blue LED is about 30 percent more efficient than an LED of a redder color. The warmer the bulb desired, the less efficient it will be, due to the fact that more red phosphor must be used and the photons coming out of the red phosphor don’t have as much energy as those from yellow phosphor.

LED bulbs are not especially energy-efficient. They…………… continues on Watching the

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