Posted: Tue Jul 07, 2015 5:44 pm Re: Basking laamp
I have the double lamp, and using the bulbs that came with I don't have a problem regulating basking temps. The UVB bulb doesn't get very hot at all... you can easily touch it after it's been on all day, so it doesn't add to the heat of the basking lamp.
The height is a minor issue. The heat needs to be further away/ the UVB needs to be closer to the surface. I have mine is about 9" from water (as per the manual), and slightly tilted so that the heat lamp is an inch or so higher, and the bulb is 3" shorter too, creating a little more height difference. If you can measure the temps on your basking platform, you can play with the height to keep the temps in range.
It's do-able, but yes, it's easier to have separate lights. Be careful though using cheap fixtures, as the heat bulb gets extremely hot. The manufacturer recommends a ceramic base for the lamp.
Also, in case you didn't see this elsewhere, make sure that you don't have anything inbetween the UVB and the basking platform like glass, acrylic or a tight mesh screen. These will all block the UV rays.