Yesterday I replaced a dead incandescent bulb in my kitchen with an LED bulb that doesn't flicker to the point where only more sophisticated measurements reveal 0.06% 100 Hz flicker without any warm-up phase (some other bulbs flicker terribly until they've warmed up). The light intensity is very low at 200 lm. The light itself is very orange, much warmer than any incandescents. As the orange color already indicates, a handheld spectrometer shows only negligible amounts of blue light. After some minutes, the light begins to stress my eyes nonetheless. I woke up with burning eyes today. It remains a mystery why LED bulbs are not usable for me. The E14 small version incandescent bulbs had strong 40% 100 Hz sine wave flicker and seemingly more blue light, but were usable.
And my good old bathroom lamp "IKEA PULT" died, so I replaced it with the latest PULT version and the regular incandescent bulb inside it suddenly triggers symptoms. I never knew why the old lamp was so comfortable to look at and I don't know why the new version triggers eye strain. I looked at the electronics and found there most probably are no electronics at all in both lamps. Instead, the ceiling cables go directly to the bulb socket. A difference is the new version has a frosted glass cover while the old one had a milky one. The measurable flicker hasn't changed, still 25% 100 Hz sine waves as usual (60 W bulb).