Meijiu’s QB288 320W LM301H Quantum Board is a passively cooled LED fixture built from three high‑efficiency quantum boards using Samsung LM301H white diodes with supplemental deep‑red 660 nm chips. Driven by a dimmable Mean Well power supply, it operates from 90–277 VAC with a 30–320 W draw and 0–10 V dim control. The long, narrow layout is intended to spread PPFD evenly over typical tent spaces: a 2.5' x 5' or 2' x 4' flowering footprint and up to 5' x 5' for veg. Listed efficacy is 3.0 μmol/J with a stated total output of 1224 and recommended hanging height of 18–24 inches. The fixture measures about 37.01 x 7.68 inches and carries an LED lifetime rating of 50,000 hours.