CFL flickers. Plenty of LED-backlight LCDs can run the backlight continuously (most at 100% will do this, and in software you can lower the brightness of the image sent to the monitor).
I don't think that it is the flicker, but the particular wavelengths.
Interesting. CFLs tend to have 5 or so narrow bandwidths whereas LED are a wide spectrum. The one thing I've noticed is that LED-backlit LCDs tend to have a cooler white point out of the box, but that's easily fixed with the custom RGB settings.
I definitely tried all of the settings, still have problems with them. Using one of those programs that changes the spectrum in the evening helps a little.
Even on my CFL I keep the brightness at the minimum setting, and I reduce contrast too. Still quite bright, brighter than the sRGB standard calls for.
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