lol just sayin, If you do it cheaply (ie hps) there's lots of heat. The way you cut down on heat is efficiency, which costs. The light mover is a way to spread out intense light (think 1000w hps). But if you're light is marginal, you can't get 2x coverage by using a light mover. You just wind up with 1/2 the light you would have had over the whole area. Its all about how many photons your plants are absorbing over the 12 hr period. If you give low light levels you will grow 50 square feet of larf.