InterLux Super HPS 400 Watt Grow LampThe Interlux Super HPS 400 Watt Grow Light Bulb is a high output lamp that delivers monster yields. It has a color spectrum heavy in reddish light, making it ideal for flowering and maximizing yields. Features of the Interlux Super HPS 400 Watt Grow Bulb Huge output: high lumen output means huge yields Flowering spectrum: heavy in orange red light for monster yields Electronic first: this bulb was designed to work with electronic ballasts Standard e39