Same light, smaller tent, too much heat?

Greetings & Love everyone!


I'm planning to start a new grow soon, but I just can't use that "2001 Space Odyssey" black monolith that is my 1SqMeter grow tent. I'm gonna get a 0,64SqMeter tent (1,80cm tall) and ideally I'd like to shove in my 400w hps but I'm wondering about the heat, that might be too much maybe.
What's your advice, do I really must invest into a cooltube or alike, or good ventilation shoudl suffice ?

Irie!

I used to run a 400 in a cab with less height than you and had bleaching and heat stress in summer, i reckon with good exchange of air and some cooler ambient you will be ok.

P.s. really nice to see you back, i spent years growing landrace because yours and others posts on here.

315W cmh

^^can you run these with a cooltube? Digi balasts and non conversion bulbs are new to me tbh.