I hung up one in the middle of a 4 plant layout (vert). I had 2 1k's on one end and 2 600's on the other end. My biggest problem was not vegging for another week, but the biggest would have been quite a handful. I am a solo gardner, so i need to be able to move these plants myself. That was my first run MPB style, but I have used the tubs for a while now.
Because my plants were at different heights, they did utilize the light as well as they could of. I did well enough my first run tho (its still got a little longer), to go ahead with a slightly larger, better set up for future use.
Plant layout (middle L is the 1500)
LPL
PLP
LPL