
That was one shop light down the middle which explains the middle daikons.(note to self - daikons get tall fast - do separate tray)
Lights I just bought from Menard's are narrow so I put two side by side. I'm now 2 inches off those Daikon trees and 4 inches on everything else. 
(hunk of wood, some wire and some screws)
When my flats end up looking like that, I just raise one end of the light bar, or lower the other.
Maybe we need a list of seedling heights so we don’t put tall seedlings in with shorter ones? LOL! ;)