Corn snakes do not use basking lights. They don't require them.
Ordinary room light is all you need. Try to give them about 12 hours of ambient light and 12 hours of no light each day to keep their "Body Clock" and Metabolism in check.
Having a "Basking Light" overhead can heat the cage too much and it will also dry out the air lowering the humidity.
Most of us place a Heat Mat under 1 end of the cage hooked up to a good thermostat. We then place a "Hide Box" directly over the heat pad. We check the temp inside the Hide Box, and adjust the thermostat until the temp inside the Hide Box is about 85 degrees. (Anywhere from about 82 to 86 is generally ok).
The other side of the cage is left un-heated and allowed to be at room temperature (about 70 to 76). Try not to let it drop below 70. I keep my cool side at about 73 and the warm side at about 85 all the time.
The snake will go to both sides, warm or cool, depending on "What he wants to do" and not what you think he should do.
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