The Grower’s Choice 2K 400W SE is a powerful Super HPS (High‑Pressure Sodium) lamp crafted for flowering applications in both hobby and commercial grow setups. Unlike typical HPS bulbs, this 400 W version delivers an ultra-high photon flux of around 700 µmol/s, thanks to its enhanced green and blue spectral components combined with far-red peaks—an ideal mix for stimulating vigorous flowering and resin production. Engineered for longevity, the 2K 400W SE maintains about 95 % of its original light output after 10,000 hours of use, making it a cost-effective choice over multiple grow cycles. Its yellow-red spectrum closely mimics natural autumn sunlight, helping to ramp up metabolic activity during the transition to flower and the entire bloom phase. But if this lighting system is too powerful for your grow space, then take a look at the ROI-E420 system, or the smaller 10K 1000W SE for better light management.
