I'm aware that as little as 200 lumens of light is enough to disrupt sleep in sensitive individuals. Blue light in 460-480nm wavelength is especially powerful for disrupting sleep via reducing melatonin secretion.
This brings me to the question - I have a number of tech gadgets which use LED lights, especially blue LED lights. These give off quite a lot of light, especially noticeable late at night.
How can I dim the LED lights in my room or change their wavelength to something less disturbing?
I tried putting semi transparent tape over them with limited success - maybe there's already something available to solve the problem?