well, I am a little late on this thread so I don't know if anyone is reading it or not, but I got the 100w in the winter and have had to replace it once already b/c it would go off for no reason and then come back on. One day it never came back on. ZooMed replaced as promised but I had to pay shipping. Well, earlier this week it is doing the same thing! If I have to replace it again and pay shipping again I'll be pissed. I don't think I should have to pay shipping for a faulty product. I am beginning to wonder if it is the clamp lamp that it is in - or if that is even possible. Anyone know?
When it is working, Luna defintely makes a choice to bask under that light for awhile and her heat lamp at other times so I am glad she has the choice and must somehow sense the UVB vs. heat.
lele
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0.1 veiled - Luna
0.2 house geckos - Gaia & Tia (MIA 
0.2 felines - Kyndra and Líta