The 400 Watt HPS bulb is the cost effective way to maintain proper levels of flower inducing light on your plants. 50,000 lumens. Our HID or high intensity discharge lights are a high quality lighting solution perfect for gaining the most out of your hydroponic crop. HID grow lights are generally used to supplement existing light or can serve as the sole source of light for your plants. Additionally, HID grow bulbs are 4 to 8 times more efficient than incandescent lamps and have a very high light output, which is why they supply the perfect spectrum for your plants and vegetables to thrive and grow to their full capacity. Our 400 watt HPS grow lights will allow your crop to reach a level of development that was once used for commercial industrial greenhouses, but are now available for your domestic use.