Is the red light bulb the only source for heat in your tank?
If so ditch the lamp. The lamps suck humidity out of the tank like crazy. An undertank heater is a much better choice. The snake can benefit from belly heat when digesting food.
Used with a thermostat you should have no problem maintaning the hot spot at 90-92.
A hot spot of 85 is kind of chilly.
The snake im sure is in no danger with the bulb and the temps your at, but you may find yourself running into problems later with other husbandry issues.
If perfection in husbandry can be reached then you have a healthy and happy snake.
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