Most people use heating pads on the bottom or the side of their tank to help keep the temps up. I live in a pretty warm area so I personally dont have experience with this. (Maybe someone else can help.) Lights in my opinion are not the best because they reduce humidity. If you decide to continue heating with lights then make sure the light is not touching the lid of the enclosure because the frog can burn itself on it.

For night viewing I use this: Exo Terra : Products : Night Glo

I tried a low watt red bulb for night viewing but it seemed to bother the animals. So far the blue has been fine.