Adding another lightt ... how much more cfm???

currently i'm using a 2x4x5 tent to flower in. I have a 600 watt cooltube with a 6 inch inline rated at 435 cfm exhausting the light. My issue is I've out grown the tent and am planning on move to a cupboard space that is roughly 6x3x10.
so i want to grab another light but i have some dilemmas.
I've been pondering the 1000. but i know two 600 would be more efficient.
If i do add another 600 or 1000 how many more cfms would i need in that area???
To be honest the 6 inch seems like it would exhaust enough air for two aircooled lights.
Right now I'm running temps of about mid Eighties with the windows closed. (( I exhaust into the room that the tent sits in .... which i'm aware can be counter productive.))
My next rooim has a crawl space to the attic to where i would be exhausting directly out of the room, hopefully making for better temps and better use of energy.
I know this is a bit of a rant. But i've only been working with HIDs for about 6 months.
What would anyone who's listening do with my space.
Two 600?
a 600 and a 1000? ( i would make sure to buy aircooled in any event)
in either case how much more airflow do you think i would need to keep temps cool in that size space with that much wattage.??
like i said the 6 inch inline moves a ton of air ... I'm just not doing it properly by exhausting into the same room the tent resides.
HELP. I rep .... I'd like to make a decision very soon since time is a bit of an issue.
I know you growers with more than one light per room can help me on this subject... I'm looking forward (hoping) for some good advice!!! I've gained alot of knowledge in this forum.

cm'on man. somebody out there has to have some knowledge for me.

last bump....

shiet, you must be growing 40 plants or sumtin

I think I would go with 2 (600) rather than the 1000. Your space is only 3' deep and the 1000 would be a waste as you need the light dispersed out length wise in the space. I think you have plenty of CFM for both lights and if you change your venting (out of the space unlike the tent) you should be golden. You have to embrace the footprint of your plants and try to get even canopy coverage across that 6' area. Hope that helps.

Stinkmeaner said:

shiet, you must be growing 40 plants or sumtin

Click to expand...

i wish

Little Tommy said:

I think I would go with 2 (600) rather than the 1000. Your space is only 3' deep and the 1000 would be a waste as you need the light dispersed out length wise in the space. I think you have plenty of CFM for both lights and if you change your venting (out of the space unlike the tent) you should be golden. You have to embrace the footprint of your plants and try to get even canopy coverage across that 6' area. Hope that helps.

Click to expand...

for sure man!!! Thank's so much... it's a huge help. I figured i was ok with the ventilation but i wasn't sure if it would be optimal to use the 600 or the 1000.
I've been growing out monsters so i was thinking the 1000 for penetration. But i'd rather go with more smaller pots than the few big pots i've been using.
Plus it makes it easier on my pocket!
I'm gonna order that other 600 soon. only other dilemma i have is to decide whether to use another cooltube or grab an air cooled hood. But i think it's obvious it would be better use of light to get the hood. I kinda learned the hard way cool tubes kinda suck for reflection.
THANKS AGAIN

Trial and error is sometimes the best teacher, although it can be expensive. Good luck with that. Cool tubes are great if you are going to hang them vertical and surround them with plants. Then you have to turn the plants 90-180 degrees every day.