Just chiming in to say that a really easy way to control the output of heat lamps is a dimmer switch. I buy the Flukers domes with a dimmer built in and use 75 watt infrared bulbs. I use this in conjunction with a UTH on the hot end to achieve my gradient. UTH is on a thermostat and I dim or turn up the lamp as needed.

https://www.petco.com/shop/en/petcos...mp-with-dimmer