LED blue light
LEDs give off a blue light like, this which feels cold compared to the warm glow of halogens or incandescent bulbs. The blue light here is coming from an LED chip. The yellow cap next to it is coated with phosphors to adjust the light quality and temperature.
October 22, 2010 10:03 AM PDT
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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