Well I can't take credit for the idea(found it while I was researching the subject). But I'll take the high five for implementation.
For everyone else remember, when you purchase these bulbs, the manufacturer thinks that you'll be looking at this light through glass. Glass filters almost all UVb. They aren't guaranteeing your safety staring straight at the bulb. You wouldn't stare at the sun would you? no you'd wear glasses. Also your eye's aren't the only worry, your skin gets very damaged from UVb. were talking skin cancer here. If you can't rig up the switch, please place them facing away from where you enter and shut them off the instant you walk in.
I'm just trying one 5.0 bulb to see. then if it works, I'll see if I can/should add more.