Hi,
It really depends on the snake but it probably won't bother them too much.
What the turning on and off will do , however, is to drastically reduce the life of the bulb.
It also drove me nuts when I tried it.
The suggested alternatives are either a proportional thermostat or a ceramic bulb that doesn't produce any light.
I would make the guard slightly larger for a ceramic though as their surface temps can get a lot higher.
dr del
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