The 400W HPS Grow Bulb is a reliable, mid-range high-pressure sodium lamp made for powerful performance during flower. Its warm red-orange spectrum with a color temperature of 2100K and an output of around 55,000 lumens promotes tight node spacing, dense bud development, and enhanced resin production, while the E39 base makes it compatible with most standard HPS fixtures. Perfect for small to medium setups, it provides exceptional canopy penetration in grow areas between 3ft×3ft and 4ft×4ft and has a rated lifespan of up to 24,000 hours — giving grower working with limited space solid results over several flowering cycles. If you need more power for a larger grow, consider the 1000W HPS Grow Bulb offers increased light output for bigger spaces. For lush veg growth before switching to flower, the 400W Metal Halide Grow Bulb is perfect to use prior to the 400W HPS.
