Heat mat + t-stat or heat tape + t-stat, BP really benefit from belly heat and additionally I would stay away from lights when using a tub, even if 10 inches away something could happen it could be tips over and it would be a disaster.
Best Heat mat in my opinion http://www.reptilebasics.com/ultratherm-heat_pads/
For a 41 quarts tub a 6x11 or 11x11 will do just fine.
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