An $8 spectrograph is a surprisingly useful tool for telling which supposedly 'red' or '1900K' lights have melatonin-suppressing blue lines.
The difficulty is if you want more than 3W of light (I currently use a color adjustable bulb set to red).
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I want an LED rather than fluorescent solution for orange light at the 40W-equiv level, but I haven't found blue-free so far.
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Even if the light is red, if it is too bright you're going to have trouble getting to sleep, so I see that as a minor issue.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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