how hot does this light get? Could ya get by w/out a cooltube in a box about 4ft wide,2 ft deep and 6 ft tall ?
I think it works a bit like this.
Mairjuana needs an ambient tempratute of roughly 70F-80F (Not sure exactly which). It also needs fresh air at both dark and light periods for maximum photosynthesis.
So a good airlflow is needed as well as controlled temps. You also need a fresh air supply so the air can keep being refreshed ie an inline fan sucking air in or blowing our. Having both is optimal i believe.
All a cooltube does it suck air past the bulb in an enclosed case to keep the temps from the bulb lower and therefore you can get the light closer to the plant without burning it.
This is often used for enclosed spaces since its harder to keep ambient temps down.
Basically if your growing in a garage then keeping low temps wont be much of a problem. But if your growing in a grow tent then yes it gets hot as fuck.
Your 'box' sounds like an enclosed space so a cooltube (if you can fit all the ventilation) would be well worth the money spent.
Again this advice is just from my own research not xp so i could be completely wrong.
Hope i helped tho
Dp
EDIT: Reading what i just said it would make sense for all growers to want a cooltube as the closer the lights are the more light that can reach bottom buds.