i'm running 3 150w cfls on my clones (18/6) for now until i get an MH, and a 250 and 150w HPS for my 3 ladies in flowering (12/12), a blower, double blade window fan, and a regular floor fan and my electric bill hasn't changed a bit. Paint the inside of cab white, much easier to deal with, and the space blanket works OK, but it is somewhat transparent, white paint will reflect better, your ladies are still looking good though!