Posted: Sat Jan 28, 2006 5:08 pm
How far away from your turtle is the basking light now? A 39-gallon tank (really?) doesn't sound that big, and mercury vapor bulbs like the Active UVHeat mentioned above give off a lot of heat. In smaller tanks, too much, actually, and this type of bulb is not recommended for small tanks for that reason. If you really wanted to try a mercury vapor bulb (they're more expensive than regular UVB lights and should be screwed into a ceramic socket because of the heat) I'd also get a lampstand like the one Zoo-Med makes (or something similar) so the distance the light is from the basking area can easily be adjusted (you need to check the temp carefully with a thermometer).
If you don't want to do that, I'd get a Reptisun UVB light. If you were going to put it, say, about 6-8 inches from your basking turtle, I'd get a 5.0; if you were going to have it further away, there's the 10.0. The bulbs come as tubes or compact flourescents, the latter being more fragile and prone to more problems (in my experience).
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-