Yeap, that's for sure. I go by Francis bains, she one of main people who put togther hole uvb dose . She has come on here, and breaks it down, like what lamp, with distance, gives you what.
I just bought meter, t5 fixture was to strong, so got t8 fixtures. I think dose for geckos is .7. It's knot much.
Anyway it's good read the information francis bains wrote about. It's around here somewhere.