i actually had a shop light, just a cheap one, 4' x2 (two 4 foot bulbs)
it worked fine, then i hooked it up to a timer, rotated the timer a few times to make sure it turned off & on (not too fast)
and it just stopped working, plugged it in to several wall outlets to make sure it wasn't the timer, and nothing..... do some shop lights have some sort of safety feature i dont know about or something?