I use 40/50W bulbs to increase the ambient temp for my Garter snakes. Anything higher wattage is too hot for my use. They have a UTH on the same side of the bulb. The UTH is on a Jumpstart thermostat (about $30 on Amazon).

Get your UTH on a thermostat and the temp on the inside of your tank under your substrate should not exceed 90°F. If the bulb is generating surface temps of 88F that's fine - I wouldn't go higher.


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