you can build corridors inbetween to seperate the grow area, this will break the AoE a little bit.
i used medium artificial lights because they were easier to fine-tune. 3 pots in a row, then a sprinkler and the next 3 pots with 1 medium artificial light in the center of the small 3 row of pots. hope that makes sense.

I am doing this:
■■■■■ (row of five pots with empty space to the top)
▣-X-▣ (heavy heater,space, and X is water sprinkler plus the ceiling lights, space, and heavy heater)
■■■■■ (another row of five pots with empty space down)

This is for my Roasted Weed. For the Last Weed add the missing machine in the empty spaces between heater and sprinkler.