Glass and plastic block up to 98% of UVB, and I believe 14% of UVA (heat)
Most cheapo UV's such as outback max and reptistar don’t do much at all.. The only good UVB tube on the market is reptisun and reptiglo's 8.0 and 10.0
I don’t think the black lights are even tested... And even if they say (better than most uv's on the market) this would be because most are utter crap.
Compacts, are DANGEROUS in there first few days of use, as they emit UVC which causes the retina to expand when it should contract, as they see it as a dull light.. This causes sever damage to their eyes... the compact also deteriorate within their first few months of use...
the BEST UVB you can get on the market, is mega ray from reptileuv.com or a T-rex active UV heat, seeing they need to be imported, the reptisun and reptiglo 8.0 and 10.0's will do fine (replaced every 6 months)
its sickening that people think its too expensive, so don’t bother, and that they 'rotate' if you can afford it, you shouldn’t have so many animals IMO
(…And who ever created this thread needs to learn how to spell)