4 foot tubes are good for about 3,000 lumens a few INCHES from the bulb.
I'd suggest taking the shop lights, and the cfls to a different room, or make a box for them, and use that as a veg area.

Let the white widow flower under the 600hps. Unless youre growing a 4'x4' monster, the 600 will be more than enough light.

Take a few clones from the 3 week flowering plant, and put them under 24hr light in your veg area...so about a month or 2 from now you harvest, and put those clones into the flower room

...thats just a suggestion, something I would do if I were you.

more bud=more better

good luck.