Personally I would suggest sticking with the 23 watters. their lumen output per watt is more than the bigger ones for the most part. And yes you could keep them all seperate to be moved individually but they would be much more efficient if you keep all the plant around the same height all over. top them and lst them down and out like a basket. and not in any way trying to be disrespectful but 100 watts for first plant 50 for additional is accurate. especially with 23 watt bulbs thats 1600 lumens per bulb and each plant is benefiting from atleast 4 of them, sharing the middle 50 watts with the plant on its side. Works great for me and I started with nearly half of that, but at this point its pretty much dead on that calculation. Also, just my 2 cents. I bought the plug in adapters and power strips to try and make fixtures but ended up buying 6 light vanity bars from lowes for 20 a piece and flume ducting as reflectors, the bulbs get too close with the light strip and you would need to have so many to cover more than one plant. The bulb spacing on the vanity bars is perfect. equating to roughly 6400 lumens per foot, again with 23 watt 1600 lumen bulbs
Good luck brother. pics of my setup in my journal