Not trying to push light movers on you by any means..... but they are not so expensive (bout $200) and cover double the area without the extra heat of extra lights,if set up properly you can hook 2 lights and cover the area of 4(with the right ligh mover).......that is my plan,not only will i save energy (running extra lights + a\c to lower heat),it won't cost nowhere near as much as buying extra ballast+lights+air-cooled hood+possibly extra inline fan(s),and mainly heat, it is very hot in summer in my area so a light mover is the ideal solution for me....