...looks like you've got a pretty thick canopy to be using lighting that far down and in the middle of your crop. Maybe do a bit of trimming in the lower parts of the plants and then revisit this idea - you also want to avoid having any leaves touch the light of course... with the think bush down there (no pun intended) it will be hard to get the light up into your lower canopy without trimming it back a little....from what I can see in those pics.