HID HUT, Inc.’s 400W HPS bulb is an awesome deal!!! It has a nearly identical color spectrum (if not better) than the most popular Horticultural bulb on the market- for a fraction of the cost. It has 55,509 lumens of output, with a color temperature of 2093 kelvin, and a color rendering index of 30. It has an average bulb life of 24,000 hours and can be used in vertical or horizontal orientation. Check out the spectrum charts from actual testing- it has 4000 lumens more than Hortilux! We promise you will be satisfied!!!