Hi rhunter,
I really don't think 2 will be able to cover to plants, of course it always depends on your grow room size or closet.
I grow with cfls and T5's, the two cfls would probably cover 2 plants each for veg for a while even maybe 4 plants close together under each light if the light is horizontal but only for the first 4 weeks, when the start to grow you will definately need more.