600w vs 1000w 4x4x6.5 tent

Hey guys so looking to add two 4x4x6.5 tents for flowering. Dwc scrog two plants per tent probably stagger for two plant harvest per month.
I've currently got a 1k watt dimmable. I need to get a second light would a 1k watt or 600 be best? I ask bc I know a 600w would be 37.5 watts per foot instead of over 50/ft which a 1k watt would provide. Also which reflector would be best, cool tube or air cooled ones with glass? Thanks! !

if you want to get more yield, grow vertically with a 1000w barebulb and a desk fan underneath.

In that space a 1k is perfect.

Well turns out I'm going to have access to both lights without having to buy either so I'll probably go with 1000w and if any issues arise I'll use the 600w thx for the assistance.

Air cooled with glass.... The tubes suck IMO...

Nice I am doing 600w 60x60x80 but keeping them in the middle.

Like said the 1000 would be perfect in that space and cool tube rock inside tents.

Hmm. So benefits of cool tube vs air cooled hoods anyone? Im probably gong to have to purchase one as my current light is bare bulb

39 x 39 x 72. W/ 1000w hydrofarm xtrasun 8 inch. I use one little cheap tower fan. I keep lights a 16 inches away. If height becomes a problem I tie the tallest parts down to make a stadium. I also have the advantage of growing underground in a root cellar. It stays 78 degrees between the lights and plant tops.