I used an old microwave oven as the enclosure, took out the magnetron, transformer and other bits that weren’t required, fitted 3 x 10W 405nm LED arrays and used a low wattage (350W) hair-styling hot air brush blowing into the cabinet. Temperature is controlled by a PID controller and Pt resistance thermometer (both a bit OTT - a simple thermostat would have done).
The microwave as enclosure has some advantages: 1) You can pick one up from a dumpster. 2) Rotating glass turntable is easy to clean and helps even out UV exposure 3) Front-loading door is convenient for loading and if you use the interlock, the LEDs and heater switch off automatically when you open the door.
Temperature can get to about 75C maxed out with this set-up - though I obviously don’t run that high!