I dont know how to make one, but if you go to ebay.co.uk and put in 'cool tube' one will come up thats ready built with a reflector. Pricey though at £90
Swizzy89304 Reviewed by Swizzy89304 on . how to build a cooltube? ok done a couple of searches but couldnt find nothing,. how do i make a cool tube for a 400w hps? any links would be appreciated.:D Rating: 5