I bought this fixture from home depot- http://www.homedepot.com/p/Lithonia-Lighting-4-Light-T5-White-High-Output-Fluorescent-High-Bay-IBC-454-MV/202838871 and to my surprise the T5 bulbs kicked the uv resin pretty fast when laminating a board. I wetted out the bottom, and when I went to tuck my laps, i noticed it was rock hard. luckily my lam was even on the bottom and the laps didnt kick.
Are you sure you don’t have any natural sun light getting in and bouncing around the room like from a window?
It’s not the fixture, it’s the type of bulbs you bought. Some of those t5 lights put off a lot of uv rays.
No sunlight. and yes, of course its the bulbs. I have been using it to my advantage since. for example, its been good for flashing the hotcoat using UV resin. Just thought I would share.
Try THESE - or move your bulbs farther away.