So basically in my toilet I have this really bright ceiling light, but when I turn it off it doesn't just instantly plunge me into darkness, but rather sort of fades out over a few seconds. It looks just like a bulb light to me, but it's pretty high up so I can't check it.
Conjecture: the bulb works by heating a wire, which at high temperatures gives off light, and when I flick off the switch it doesn't just instantly cool down, it takes a while, and with residual heat gives off less and less light with each passing second. But if this is the case, I'm still a tad confused. I thought that for radiation like this the wavelength should vary with the heat produced? If so, when it dims, shouldn't the light change color to a more reddish and pinkish (less energetic) wavelengths? Instead what I observe is that it just keeps the same warm yellow glow, just getting less and less bright as time goes on. Or are my eyes too bad at detecting such a small change?
Tried searching on google and physics stackexchange (seems like a pretty common problem) but for some reason can't find it anywhere. Maybe I'm wording it badly.