The MASTER HPI-T Plus 400W/643 E39 1SL is a metal halide (MH) grow lamp designed for robust growth during veg. With a daylight-balanced 4300K spectrum, it promotes strong root development, tight node spacing, and healthy canopy formation during the early growth stages. This 400W bulb features high lumen output with excellent color rendering — making it especially beneficial for clones, early veg cycles, and maintaining mother plants. With an E39 base, it’s compatible with a variety of MH fixtures, whether you’re growing at home or in a commercial setting. It has an average lifespan of 20,000 hours, offering dependable light quality with minimal maintenance over several cycles. For a smooth transition into flower, the MASTER SON-T PIA Plus 400W E40 has a bloom-focused HPS spectrum designed for dense bud production. For consistent flowering performance with the same wattage, the MASTER GreenPower CG T 400W delivers enhanced spectral efficiency and deep canopy penetration.
