In a couple days I'll move my five seven-inchers (bagweed) from veg under ten 26 watt 6500k (18/6) into my cabinet housing a couple females under 400 watt hps, 12/12. I'll probably wait a month before starting a new batch of 10 from seed. The ten 26 watt 6500k lights will just be sitting around. Would it be worthwhile (and energy) to try to incorporate the ten into the cabinet to supplement the 400 watt hps? Heat hasn't been a problem (81.5 max days, 64 min nights). Thanks for your response.

Any comments?

i would think thats over kill and you should just start your new plants now or get 1 good mother going

Personally, I would give it a shot, but I don't know much about cabinet/closet grows. I would put them around/under the plants for some supplemental light, if it's not too much of a hassle. And if it messes up your temperatures then definitely don't do it, cause those are some pretty perfect temps you got there.

from what i understand, you can never have enough light.