Just been reading this post. I swapped from using halogen basking lights, to the DHP, approx 1yr ago when I upgraded my torts vivs. My Indian Star and Radiated tortoises seem to bask well under the DHP, but it is immediately next to a UV flood, so the area is light and heat rich. I like the DHP, a lot, as a source of basking heat, when paired with a source of high visible light. I do also have T5 UV tubes in the vivs for ambient light. I may play around with the lighting a little more.