Meijiu 480W LM281B Quantum Board is a dimmable indoor horticulture LED fixture built around two full‑spectrum quantum boards populated with Samsung LM281B diodes and supplemental 660 nm deep red. Driven by an Inventronics power supply, it operates from 90–277 VAC and can be adjusted from 60 up to 480 W. The unit is specified for a 4 x 4 ft flowering footprint (5 x 5 ft veg) with a system efficacy of 2.65 μmol/J and measured PPFD up to about 1370 μmol/m²/s. The passive‑cooled frame measures roughly 25.98 x 25.08 inches and is typically mounted 18–24 inches above the canopy. Rated lifetime is 50,000 hours. External 0–10 V control via RJ45/RJ14 is supported with compatible controllers.
