there must be a difference in the quality of some of these bulbs. I react to some of them, and develop myaclonus jerks. which means I have to exit certain stores immediately, or I'll have myaclonus for a day or two. Myaclonus is an involuntary jerking. I get it in the legs, then cannot walk. I can't stand either because of the jerking. It is annoying. Something like hiccups, only worse.