This is California Light Works flagship grow light and it deserves consideration by anyone looking for serious grow lighting. This light pumps out so much light I had to run it on a LightRail light mover. What a wonderful combination, made for each other. The LED controller, (not included), is a must have if youâ€™re serious....not only to set times and spectrum, I used it at 75% to get thru a hot spell. The results were spectacular with everything in that light path getting fat and heavy. I did have to put bonnets, (2â€ squares of floating cover), on several grow tops that showed light stress, even with the mover. This is a big light and covers a big footprint. I really like this 1100 and love the 550s.