They flicker. The fix is no to take them out, but put in more of them in the same area, in groups. Their individual flickers will cancel each other out, not to mention upping the total light which is good.
All this, BTW, is in the prior thread. Thing is, SAD-sufferers cannot make sense out of it all till they get un-SAD. That's they the prior thread is aimed at people who love them, not the people who are stuck in it.
Of course [giggly shrug], I'm only ten years ahead of everyone else here on it, but don't listen to ME. :~) Naw-- just visit my SAD-lit house for a weekend. (Your LR recliner and guest room have the first one we made, and the last one we bought-- waiting for you.)