Quantum Cube 304 is a square horticulture LED board from Lientec LED’s Quantum Cube family. It follows the brand’s cube format with a 140×140 mm PCB mated to a dedicated heatsink and operates in the 40–55 V DC range. Lientec specifies Quantum Cube boards up to about 125 W at 2700 mA and around 100 W at 2100 mA, with a single cube intended to cover roughly 40×40 to 60×60 cm; multi‑cube arrays scale coverage to 80×80–120×120 cm. The 304 variant is an all‑white array and, unlike the 2706 model, omits the integrated 660 nm/720 nm emitters. Community documentation identifies the 304 as using 304 Samsung LM561C S6 mid‑power diodes and commonly offered in 3000 K or 3500 K options.
