believe me the lights r as low as they can go. they r practically touching the tops.they were just trimmed b 4 i took pics. had some yellowing in lower leaves. just used a lil miracle gro for a quick fix did'nt feed them all w MG.some showed yellowing in between the veins on the leaves. figure its a mg def. sprayed epsom salt on leaves.ph was high at first but seems to b fine now but keeping an eye of course. too much lime in the initial mixing of soil made ph high.used vinegar to bring back down.lil home remedy i read about. waiting to see how it turns out n if that was the right diagnosis. by proper lites i suppose u mean metal halide? small closet i have n heat would then b an issue there.putting xhaust fan would b 2 much work n damage to the old plaster.small mounted fan moves air thru closet pretty good.stems seem to b strong n thick. small grow like that what do u think the yeild would b on a few of those??