I am currently thinking about combining a flourescent tube (non-LED) with an electrical balast device. It could take care of the two known causes for light eye strain:
- Different tubes have different spectra. For people with (White) LED brightness issues, it is likely there exist tubes that have a usable spectrum.
- Electrical ballasts usually deliver a high frequency, which combined with the gas discharge delay could deliver an almost flicker-free output.
However, as there is no demand for it, those devices can't adjust their frequency. Nor do manufacturers have to mention the frequency. And there's always the chance they didn't take care of the 50/60 Hz power network AC that can cause the tube to flicker at 100/120 Hz. Think of it as 2 different frequencies that simultaneously exist. One is the power network's flicker, that has to be smoothed out, and the second one is the frequency the electrical ballast produces.
It will be a trial and error process, but in the end this could be the lamp we're searching for. Usually you'd require a technician to install an electrical ballast for you, but I found there are also electrical ballasts that you can just plug in your wall socket. They are made for fish tanks, for example. Like this one: https://www.amazon.de/-/en/GLO-Glomat-Ballast-Fluorescent-Tubes/dp/B001941V90/
Maybe those are not what we're searching for and in the end a technician must install a lamp for us. But the combination of the right electronic ballast and tube could finally do the trick.