More light is almost always a good thing. What are you going to do with the new girls while you wait for these to finish?
More light is the best thing i've done in this room lol, so glad to have more power, one of the ballasts is burned out I think but otherwise 2x 600w hps lights to add. I have my clones and bag seed in the kitchen cupboard right now, i'm in the process of dividing my room to make a veg area for them. I'm going to be very busy tonight, will get some pics of the room up soon.