Whenever a bulb burns out, you buy a new one. Add the price of the bulbs up for about 10-15 years and you'll have your RHP together
They're just a much better, gentler, and longer lasting heating element.
I have a 36x24x24 AP cage with an RHP, and w/o the thermostat, it heats the basking shelf (halfway down the cage) to about 110!
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