Thats only 1,200lumens psf... your plants will grow hella-slow with that. If you buy 2 of those 8255 lumen shop lights and use them with the compacts u have now, then you'll have a whoping 3,034.44 lumens psf. And thats a good starting place for lumens psf.
These shoplights are great for veg rooms since they are high in blue (great for veg), use only 65watts of electricity, put out 8,255lumens (thats 127 lumens per watt!!), and are only $25 each. Simply taking off the clear plastic cover and maybe putting some holes in the back of the light as Xzoomd suggested would be enough to keep them cool.
Just my $0.02 though... do what you want.
