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I have a OSC CCD camera and a light box which is illuminated by LED's. I have 3 humps on the histogram of my flat fields. This is presumably related to the emission spectrum of the LED's. White light LED's are basically blue LED's with a phosphor coating that is "excited" by the blue light and then emits further light in the red and green bands. I dont know why your images come out with colour shifts though. If the flats are applied to the light images before Bayer interpolation then the 3 humps shouldn't matter. What software are you using? Images Plus does a good job for me with my OSC camera (SBIG).
Neale.
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