i got 3 ceiling shop lights for a hugh shop that are 400 watt mercury vapor lights i think with balest built in but they dont seam to be that bright.i never saw how bright it should be when close to the ground but i was wasndering if it should look really bright or if it was powerfull but not blindingly bright like i would imagine.any info would be nice its wired strait into the house wireing were the ceiling light was.

thanks