InterLux 400 Watt Double Ended HPS Grow BulbThe Interlux 400 Watt Double Ended HPS Grow Bulb is much more efficient than a single ended bulb, using the same wattage to produce higher par and lumen output. It has a color spectrum heavy in reddish light, making it ideal for flowering and maximizing yields. The light deteriorates slower than traditional bulbs, meaning it retains more of its initial power for far longer. 5 reasons why Interlux 400 watt double ended HPS lamps are superior to