No, switching out the bulbs is not necessary. The ambient light of the room from a window is enough to create a sense of day/night for them. Beyond that, the only reason to change them out is if you need the heat for your BP, but the enclosure is in a place where the halogen bulb would make it difficult for someone to sleep at night.
As a precaution, the more oils from your skin get on the bulbs, the shorter their life span will be. If you do end up sticking with the switch, I recommend doing it with something other than your bare fingers.
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