here is an idea.

When i was a lad my grandfather got out this cucumber tube. it is a glass tube you grow squashes and cucumbers in keeps them straight. these cucumber tubes could be just what your looking for.



see an ideal cooling tube but be warned these are vintage, so ask your grandparents and check ebay

Tamzi

it has to be tempered glass to handle the heat. just remember cool tubes create a massive hot spot directly beneath them so you have to stay 16 in away from plants loosing out on 100,000+ lumens with a 1000w

look up "bake around" on e-bay these guys work great and even fit 1000 watt bulbs

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The bake arounds are very good to use ideally you'll want a 6 inch tube, but you can still manage to get a 400 watt into a 4 inch tube. All i used is a flower vase that is 1/4 thick and have been using it for 6 months as long as you have enough air passing through you don't need tempered although it is better and safer. Mine is not temperd and i can touch the tube while the light is on directly where the light is! You never know unless you try right! Good luck. And by the way mine is 2 inches away no burns or nothing. One thing to remember though try to push the air though it cause the fan will build up heat. Any questions let me know. I will post a pic of it later tonight.

never cut glass that has already been shaped or you will damage its molecular structure

where do you get the light socket hookup? i have looked everywhere. Can I Build One?