They've gotten better as I've been using them since 2009, but recently I got a bad batch of 160W, so I'm now looking at Mega Ray, who had some problems but seem to be all right now, too. Arcadia has come out with an MVB bulb, found it on
www.lightyourreptiles.com. A friend of mine got the 80W and is very pleased with the UVB output. So there are a couple of others to look at. Mega Ray as it's own webside, just google it and you'll find it, then you can read up on it.