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Great. 4x4 is perfect for 400w. You might be able to fit a few more, get a real SoG or sea of green going lol. How big are the planters or are you going hydro? It might be a good idea to go for square pots if possible. Even if each pot's footprint is about a square foot each, you could squeeze in about 9, I think.
The only problem with using 400w HPS in veg is that it is overkill for the plants and will be murderous on electricity bills. I think you'd be fine with the 30x2 watts of CFL in veg. However, it also depends on how long you plan to veg, how tall you want to let your plants get and so on. I think those 60 watts will do you justice in veg. If anything you can add another 30w bulb. I think you should be gravy with that much light up to about 12" tall before you transition to flower.
Don't sweat the 125w cfl. That's just what I was using from my first grow from start to finish. Now I just use it for veg. The general idea is that you start with low light for seedlings and clones, step it up a bit for veg, and then BLAST the plants with light in flower.
All in all, I think you're good so far.
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