US Art Supply Lightmaster Giant 45-1/4" Diagonal (A1) 26 3/4" x 36 3/4" LED Lightbox Board- 12-Volt Super-Bright Ultra-Thin 3/8" Profile Light Box Pad with 110V AC Power Adapter & Dimmable LED
Lightmaster - Wikipedia
Lightmaster Core Rulebook - Gurbintroll Games | DriveThruRPG.com