I used a light dimmer on my heat lamp:
https://www.lowes.com/pd/Lutron-Rotary-600-Watt-Single-Pole-White-Ivory-Dimmer/1059607
The dimmer is wired in a 2 gang box:
https://www.lowes.com/pd/CARLON-2-Gang-Blue-Plastic-Old-Work-Standard-Switch-Outlet-Wall-Electrical-Box/1000975972
With an outlet...