Quote:
The mercury Vapour bulbs also do not need to be as close to the animal as a tube or spiral.
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Good point I forgot about that...
Also you want to keep in mind if you do go for a tube bulb, it will probably need to be placed inside the tank (depending on your set up) setting the tube fixture on top of screen is not going to do it. Screen filters out the UVB. like Wayne mentioned too, you need to be sure you check the manufactures recommendation on how far away to place the tube. If it is too far, no UVB. I believe the tube for my beardies is recommended at 14 inches away (not 100% sure of that but I know it is fairly close considering the size of their enclosures)