I finally finished the epoxy hot box. I wired the two heating lights through a regular light switch that plugs into the wall. Also, I finished hot wire cutting the Styrofoam insulation tiles & installing them.
After finishing the hot box, I installed a 75 watt light bulb in the bottom bay and a 40 watt bulb in the top bay. After firing it up, I quickly realized that the insulation was working as advertised… it may have been working a little too well. The hot box quickly shot up over 125° F.
Over the last few days, I tweaked the bulb strength to dial in the temp between ~90-100° F. The box is so well insulated, that I finally ended up with ONE 7.5 watt bulb in the bottom bay and the box stays right around 100° F.