light movers are great but not if your trying to expand the space the light covers by more than say 20%, your best bet would be to go with 3-600's as opposed to 2 1000's, you would get about 5000 more lumens and 200 watts less power, its really a tough call though, lets say you were using a 4x8 table, i think 3 600's hanging over it would do a better job than 2 1000's when deciding to use a light mover i would take in to consideration the layout of the grow space, like a big square area would do best with maybe 2 lights running back and forth on movers where as a rectangle area would do best with like 3 lights stationary
