I have a 5.0 uvb bulb...I was advised not to go higher. its a coil bulb, which I know some people are against...but that's what I have at the moment. Anyways...my question is...I have a place for another bulb...will it hurt to have 2 5.0 uvb bulbs? I would like a little more light. Or maybe I should get a uva bulb instead?