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Here's a photo of one of our 2x3 LEDs laying against a piece of bright-white
Inkjet paper. We've turned down the ambient light so the difference can be
easily seen. The front of the LED is on the right side (it's the yellowish
colored emitting surface that you see in our main picture). This area of the
LED has been "doped" with a color correcting material to bring the wavelength
of the light very close to pure white. On the left side is the "shine-through"
that is shining out the back of the LED's ceramic case. Notice the bluish cast
to this "uncorrected" light. This is more typical of many "white" LEDs. In our
applications, we typically paint the LED housing to prevent any "shine
through" from occurring. We've found that a coat or two of Poly Scale Night
Black does an excellent job of blocking the stray light that is emitted
from the sides and back of LEDs. The added benefit is that this is an acrylic
and doesn't attack anything nor does it conduct electricity (you can paint
over the wires and solder joints without causing a short).
Copyright © 2002, 2003
Ngineering
Last modified:
March 06, 2005
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