They're fine but you don't want to leave them on 24/7. The problem arose with people leaving red lights on at night because they think the ball python can't see it, which is not true. You can have a red light on for 12 hours a day, just turn it off at night so you don't disrupt their day/night pattern.
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Do you have a source? Because I've read differently, and all the red night time bulbs, would suggest otherwise. I'd like more information about this.