The Maxsisun PB4000 is Maxsisun’s most powerful fixture in the PB series, drawing a true 400 W from the wall and delivering an output equivalent to an 800 W HID setup. Featuring around 1,200-1,400 Samsung LEDs (blending 3,500 K and 6,500 K white chips plus deep-red 660 nm elements), it offers a full-cycle spectrum tailored for both vegetative growth and florals, making it ideal for 4x4 ft flowering tents or up to 5x5 ft in vegetative phase. Housed in a rugged, IP65-rated aluminum panel with glue-coated LEDs, the PB4000 achieves impressive photon efficacy (~2.1 µmol/J) while using passive cooling. One of its standout features is the included remote control, which enables seamless dimming from 0-100%, grouping controls across multiple units, and simplified scheduling. Maxsisun provides many lighting solutions for growing environments. If you’d prefer to try out something different from them, don’t hesitate to check out their MU1200 or PB1000 Pro systems.
