So yes there is glass in the reflector and i can run duct to the outside through the port on the side at the top how do I get cold air into the tent if my hood is a closed circuit? And yeah I'm gonna try to insulate the bucket I read that can be effective we will see and also considering converting to rdwc with my res outside the tent maybe I don't know I just need to do something fast lol
you'll have to experiment but i'm thinking the closed circuit setup should hardly give off any heat from the bulb/reflector. i have a 600 too in a cool tube and with my 6" fan halfspeed i can touch my glass. is there a third port on the bottom of the tent that you could open and put a small fan in front of to blow fresh air in? or maybe leave the tent flap open a bit? just try different combos and as long as you can keep it in the high 70's low 80s you'll be fine.
since your plant is recuperating, i'd put the light about 24". after the roots come back, you can always lower it later. let's get her back healthy and go from there.
after trying the single buckets dwc, i built a 4 site rdwc with a chiller etc. it grew some huge plants and the root balls were at least as big as basketballs. shoot me a PM later and i'll give you the lowdown of how i built it. i'll try to find some pics too.