I've run 24 hrs for years, and i dont see enough differance to change at all, and ive tried all the time combos. Most of you know how big my ladies get. If you want to get as much out of those as you can, get the 5 foot tall thought out, and go fr the surface area. Since you've got those in garbage pales, the roots are really gonna expand everywhere, they may be deeper that wipe, but they stil are quite wide. More powerfull light doesnt necessarily me less stretch, actually t5s are amazing for that, and even better are high output cfls. I have rooms filled with each type of lighting so I can see the effects side by side daily. If your plants are healthy and your at a good distance from your light, they'll grow fine in that lighting. But, as for surface area, begin pinching your plants now, so litterally pinch the stem of the top/highest branches(higher than the canopy), just squeeze it enough for it to comress, dont mash it, but you do want it to pop kind of and flatten out a bit, then just bend it down a little bit and walk away, dont worry about it hanging, it will be straight again in 24 hours, you wont lose the top you bent, and it will force growth from the bottom branches. Its like topping, but you still get to keep you main top/whatever else you need to manipulate. I pinch about 1-3 inches from the top, depending on how far down it has to come, bu tdont really go any further than that, they can handle it, but they wont turn back quite the way you want them to. This will give you better yield, and things will be easier to work on, but for the love of god stake em up if you do it like this man, or you'll have branches hitting the floor real fast, especially with that girl, just she bangs out the baseball bat buds. Keep pinching for the first 2 weeks of flower, maybe a little longer, if you flower at 2 feet, you'll be able to finish at about 4 feet or less(long as you do things right of course), and each plant will be like 3 feet wide(whatever it is, yu know what i mean)
I will say on the lighting, many find 1000 for veg a bit strong, and you can get light stress quite easily if they get too close, so thats another good pinch reason I guess.