Blacklights tend to put out less heat than infrared bulbs watt per watt
I prefer infrared lamps because of this (power bill is less)
When using heat lamps I like to get a bulb one wattage incrment larger than I think I need then use a cheap thermostat (like this one: http://www.amazon.com/Hydrofarm-MTPR.../dp/B000NZZG3S) or a lamp dimmer to regulate the amount of heat emitted.
The biggest drawback to using heat lamps is that they kill the humidity in the tank.
For you I would say that a 75 watt bulb will be more than enough but a 100 watt will give you some headroom. No matter what I suggest that you regulate the heat source.
Check out this thread: http://ball-pythons.net/forums/showt...t-Thermometers
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