2 x 300W Maxibright Blue 6400k CFL vs 600W Metal Halide

One of my friends has just given me two of these bulbs. I originally intended to use a single 600W MH for veg and then 2 x 600W HPS for flower.

Is there any advantage in using these CFL's for veg over the MH?

No but the cfl's should work fine for veg