4x 600W HPS in 240cm x 240xm x 200cm - Would I need Cooltubes?

If I build a setup with 4x 600W HPS lamps in a growtent that is 240x240x200cm would cooltubes be a must or would it be enough with just normal ventilation? Are there any disadvantages with using cooltubes?

get tubes, run vents through tubes, otherwise you'll have a lot of heat issues and won't be able to keep the lights as close as you'd like to the canopy

its a pretty small tent, you may even have problem with the tubes

Enduro is right you'd probably be better served with 2x1000w, that or led. If you haven't used high wattage HID before get ready to be shocked the heat issues are for real unless you have a lot of space and good venting which will cost you.