Less but does, try viewing it from your phones camera in 240 fps slo mo
Incandescent does not flicker.
There are actually a few but the problem is they aren't advertised as flicker free. Those which are advertised as flicker free especially by Phillips aren't really flicker free, just gimmick.If you're thinking of LED's I don't know if these are available due to high price.
Those lights which run on DC, generally, do not Flicker. There are bulbs & lights which have chips built inside them that converts AC to DC. I've one and it doesn't flicker.The high quality ones used in torches don't flicker but are expensive.
Lots of people have without the realisation yet.Do you have a problem with existing LED's?