Your better off not using the umb's.. Sure, they have allot of light distribution, but at the price of light density/concentration.. Also, that damn things like a bubble and heat rises.. Where do you think that heat is going to go? No where because of the dome light structure.. Those reflectors were originally developed with vertical use in mind (photo shoots and what not)
if you want my advice, or my " what I'd do" I would get rid of the 1000w, sell it (I would personally sell it when I have no plants goin or have someone else sell it for you) but I'd rid of that, and go with multiple 400w's or 600w's so you can have a wide spread distribution like what I think your wanting.. But you would keep your light intensity strong and you'll get more light onto the plants. Set it up in a way where the edges of the line where the reflector stops the light.. Over lap those lines where they get double the light on the sides and you'll have a somewhat more even light distribution since that area is usually where you lose light (the areas were you'll notice the plants growing taller? Around the edges) and if you over lap the edges with two lights, your still losing light , but your getting more light there by doubling up.. It's like.. Say your plants directly under the light bulb are receiving 1 (just as an example) and the outer perimeter is only getting 0.25 .. Well if you over lap the edges of the perimeter.. Than you get something like 0.5 and it may still be weaker than the direct middle where it's losing less light, but your getting better than before.. If you use multiple lower watts, than you get good light in somewhat more even distribution compared to one powerful light that gets big perimeter, but you run the risk of hitting those middle plants with like 2 or 2.5 times.. Which could be too much light if your not introducing co2 and good nutes and could harm younger plants. Good luck!
