Hello My boyfriend has 2 2year old horsefield tortoises. Recently he took them to the vet and the vet said they are fine, but they need a uv bulb as they only have a heat one. So we bought a uvb bulb that we saw on the tortoise shop website which is where he got them from. Its an Arcadia 7% uvb 23w d3 compact reptile lamp. We took the heat bulb out the lamp and put the uvb one in and everything seems fine, although we assumed it would give out heat, but we dont think it is giving out very much at all. Is this ok, or do they need another heat one as well, or is the above uvb bulb enough? thank you very much!