Ball pythons CAN see red light. What they cannot see is INFA RED which is an invisible wavelength of heat energy given off by all heat emitters. Infa red is also invisible to humans and the red you see coming out of your red bulb isn't this although it is also emitting it. The 'animals can't see red light' myth may be perpetuated by the fact that deep sea animals tend to be red to appear invisible to prey and predators as red light is filtered out fastest.