Lantern we are not talking about 1000 watts vs 2 600 watters... Everybody knows 200 more wattage would be better from more points of light. I am talking about my particular situation.. I do not wish to have 3 hoods 3 ballast 3 bulbs 3 glass to clean all in a tent.. 1000 watters are more logical in my situation.. and the extra 200 watts doesnt hurt over the 1800 watts I would get from 3 600's. Some times you dont read to come up with solutions that work for YOUR situation.. you actually have to do it... THis is an age old debate and I dont wish to debate it with you in this thread.. Most books are greatly opinionated as well.. you know how many age old books are proven wrong or questionable daily that were considered grow bible's for years. Another thing I have no Idea what you mean about being able to put the 600 watter closer to the canopy? Maybe in a open hood that is very true.. BUT that is the point of a air cooled system.. I can lay my palm flat on my glass of my hood and not get burnt.. I can set the hood 6-8 inches above my canopy with no problems with burning because the lights are cooled? So you going to say 155,000 LUmens is not greater then the 90,000 lumens or so that a 600 puts out at the same height? Now if I had to keep my hood higher above the canopy cus of the heat... the yes the lumen gain would be negligible because it would be lost in the distance. Sometimes you have to stop reading and start applying .. and see what works for you .. but once your grow is done .. I am more then willing to compare yield results and bud density with you. I have grown at the collective under 600 watters.. eye hortilux mind you.. I have grown under 400 watters.. I have grown under 430 watt ceramic Metal Halide's ( wide spectrum) .. And I can tell you the best results I have seen is from this lighting setup ..Also at the collective I use to grow it .. he had 600's next to 400's and even a couple 1000's in the room.. I could walk in the grow room and tell you which lights were what just by looking at the intensity down the plant. I can tell you that if you put a 400 a 600 and a 1000 watter all above the canopy approx 8 inches.. the 1000 watter will penetrate farther and that it will produce more yield... 155,000 lumens at the same canopy distance as 88,000 lumens is more plain and simple.. Have you ever ran a 1000 watter in your life? or grew under 1 ?