Rapid LED’s Mass Medical Strains Supplement Bar is a mixed‑spectrum LED add‑on built to complement primary grow lighting. Its recipe, designed with Mass Medical Strains, combines targeted UVA/violet diodes (385, 395, 405, 420 nm) with blue, photo red, far red and infrared (840–870 nm) to fill spectral gaps. The bar draws about 60 W from LEDs and uses three independently dimmable channels driven by Mean Well LDD‑700LS; without a controller all channels run at 100%. A heatsink is recommended for rigidity and thermal management, and the bar slides into Rapid LED’s 4' x 4' Canopy Substrate via the Supplemental Canopy Heatsink. Rapid LED lists a 2' x 4' coverage for its supplemental‑bar format, suitable for side, under‑canopy or top‑up applications.