SonoFarm PRO Series 4000 is a 400 W, full‑spectrum LED quantum‑board fixture built for 4×4 ft flowering or up to 5×5 ft vegetative coverage. It uses Samsung LM301B diodes driven by a Mean Well driver and includes a 0–100% dimmer with RJ daisy‑chain control. The spectrum combines 3000K and 5000K white with 660 nm deep red and 760 nm IR to support all plant stages. Efficiency is rated at 2.7 μmol/J. The panel measures about 24 × 19 inches and the listed lifespan is 100,000 hours. Additional details on the product page note 100–277 V input and fanless, silent operation. SonoFarm markets a 5‑year warranty for this model. This unit fits standard 4×4 tents seeking even canopy PPFD.
