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Hi Troy
I use white LED’s in my flat field box but I’m sure if I were to analyse the spectrum they produce it would likely have a lot of blue.
I guess that if you are shooting B&W only and the red LED’s emission wavelengths are not blocked by anything in the imaging train, such as IR block filters, then I can’t see why red LED’s could not be used?
But, if you were to migrate to LRGB imaging through RGB filters, then I suspect that white light would be the preferred option due to G&B absorbing the red? You could probably compensate by increasing the exposures for G&B and in post processing, but that makes more work so I suspect it’s better to solve the problem up front with white light flat fields.
I’m just guessing at the above as I really haven’t done enough LRGB imaging to see it working in real life, so I’ll offer my comments as a starting point. Hopefully more experienced and knowledgeable imagers can address your question more fully.
I think that photometry might be the first casualty of using red LED’s if you wanted to measure stars?
Cheers
Dennis
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