The bulb is found at a local pet store. Below are some more pictures of our setup. Just click on the Thumbnails to see larger versions. The first photo is of Tritan and Salem basking in the warmth of the heat lamp. The second photo is of the entire land area, nicely covered with reptile carpet so the turtles cannot hurt themselves.
Third shot is of the pond, the pump and of course, the turtles.
Last shot is of the pile of rocks we put into the tank so the turtles can climb out. The pile doubles as a cave for the turtles to hide in, a place to hide the heater to prevent damage and great place to put the recirculation pump so that all water is moving. Any questions you have about our setup, feel free to email me and I will be glad to answer them.