I have a few T8s all using 75w RHPs from Pro-Panel, and they are also in rooms that can get "cold", relatively speaking. Something you can try; add more stuff. With RHPs you're really relying on the objects inside the enclosure to radiate heat in order to raise the ambient temp. I use aspen substrate and find that it doesn't really radiate much heat, which isn't surprising as wood is a poor heat conductor. What really helps is adding rocks, plastic hides, anything that warms up and radiates heat well, but I find rocks work best. Rocks have the added benefit of helping to raise humidity as well. When my BPs go into shed, I mist the enclosure down and drench the rocks. They will absorb a bit of moisture and take longer to dry than the aspen, thus giving more steady humidity for longer.
Add a few rocks around the enclosure, give it 24 - 48 hours and post an update. I'll bet you'll see results.
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