Cooltube/coolhood glass thickness

Going to DIY a cool tube (Fuck paying $200 for one)...

Wondering how thick the glass would have to be to contain the heat but still let the light easily escape...

Also, would standard sheet metal do the trick to reflect the light back to the plants?

Cheeers

$200?

I paid less than $150 for a 400W ballast, HPS bulb, hangers, AND 6" tube w/ reflector.

The tempered glass on my air cooled hood is 1/8" thick.

ULMResearch said:

$200?

I paid less than $150 for a 400W ballast, HPS bulb, hangers, AND 6" tube w/ reflector.

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Yeah, tell me about it, stupid backwards country...
I was going to just buy one in the US and ship it over but shipping always killed it for me...
Hell, the ones for around $200NZD are even plastic!!

Little Tommy said:

The tempered glass on my air cooled hood is 1/8" thick.

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Cheers man, hopefully I'll be able to find something around that thickness...

My bad. Didn't mean to imply you were incapable of googling. Darn foreign countries I'd love to visit!

why not go vertical?

hang a bulb vertically in the center and have a fan under it taking away all the radiant heat.

ULMResearch said:

My bad. Didn't mean to imply you were incapable of googling. Darn foreign countries I'd love to visit!

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Don't worry man! I didn't take it that way at all
Yeah, New Zealand's okay... However anything marijuana cultivating related costs 2x-5x a simple 400w ballast is $300
ridiculous considering about half the youth in NZ has done marijuana in the last 12months xD

Clown Baby said:

View attachment 1706011why not go vertical?

hang a bulb vertically in the center and have a fan under it taking away all the radiant heat.

Click to expand...

I was thinking about that while ago, I'd would have to find a fan smaller than 50cm since my grow box isn't that wide..
I always wondered how much airflow is needed around the light (I have a 400w)