I think much depends on the set-up. Clearly, the RHPs in my t8 are affecting the ambient temps, and not by just a few degrees. At any moment over the last two weeks, the temp inside the enclosure has been between 10 and 20 degrees F warmer then the temp outside the enclosure. Now, I've got cypress mulch as substrate, along with terra cotta pots as hides. The RHP warms the pot and the mulch below it, which, in turn, transfers some heat to the air...I think the mulch plays a big role here as it has much more surface area in contact with the air then a flat surface would. This, coupled with the limited height of the t8, allows the ambients to stay elevated where they are. My two cents.
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