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p1mrx
on Sept 27, 2015
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Constructing a spectrometer using a CD
White LEDs are just blue LEDs with a yellow phosphor, so the spectrum usually has a blue hump, and a red-green hump:
http://www.soundandvision.com/content/led-vs-cfl-bulbs-color...
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http://www.soundandvision.com/content/led-vs-cfl-bulbs-color...