I bet your temps would go down if you ran your light exhaust and your tent exhaust separately. for your light, use a 400cfm fan to blow through the inline duct out the other side of the tent. instead of sucking air out of the tent through a carbon filter.
now for your tent, keep your intake the same. to exhaust your tent, just use a faster cfm fan and run it through a carbon filter to the outside of the tent.
I havn't used a tent, but i think this is the basic idea of keeping them cool with a 1000w.
hello everyone...i am about to be startin a jardin tent for flow. it is 5 x 5 x 7 and i also , like kgb planned on using a 1000w, i am a tent nube and would like all the input u guys had as far as the ventalation,fan cfm,etc.character zero, if you could elaborate a litle more, or kgb..anyone.it would be a huge help. peace Burn