The ambient light entering the enclosure from your room is plenty. Ball pythons are nocturnal animals, in the wild during the day they hide underground and they come out at night to hunt.
I hope you have a true reptile vivarium and not a fish tank with a screen top. Otherwise maintaining heat and humidity is a major pain in the patookus as the warm, moist air floats right out the top of the enclosure.
I've never used orchid bark. A lot of folks who want to use a natural substrate have started using PLANT!T Coco Planting Chips and swear it can't be beat for the price:
http://www.horticulturesource.com/pr...ducts_id=19891
For heat ball pythons seem to do best with an under-tank heater regulated by a thermostat.









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