Originally Posted by
sabeluc
One more data point: the superbright red LEDs are not safe for x-ray film when directly aimed at them or anywhere close. With direct bright exposure from 4', the negatives are nearly black after normal development. Reflected light that is just bright enough to work in comfortably also produced a slight fogging. I found that a single red superbright LED reflected off the rear wall of my darkroom to be safe (6' to the wall + 12' back to the sink), by which I mean I can't tell the difference between film exposed to that light and unexposed film by visual inspection. However, at that point the reflected light is so dim that it takes about 10 minutes for my eyes to adjust enough to make out fuzzy shapes in the sink.
I think these bulbs might be worse than the red LED in the headlamp I tested with before.
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