The halogens you are looking at do produce heat but as mentioned using a lamp dimmer will allow this to function as a "mini RHP" of sorts as it will up the ambient air in the cage itself as the air passing under this will be heated. In regards to burning themselves, I have not had a snake burn themselves in my care in 8 yrs using these in cages. The lights to worry with are un protected incandescent bulbs in a cage as the snake can crawl over the bulb thus the burns on the belly . I have seen my boas raise up to inspect these lights feel the heat and pull back, contrary to belief the snakes wont burn themselves when they fell the heat like this. Depending on the height of the cage the hot spot will vary between 88-94 in a 12" cage in a 24 diameter approx. and in a 18" cage it will drop abut 4 degrees /- 1-2 degrees , and a 24" cage it will drop bout 6-8 degrees under the light. Many people use these in the cages and are very happy with them and in a cold cage environment they do greatly aid in the heating of a cage for little cost to the operator and the snakes seem to dig them also .
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