Has anyone actually proved cooltubes reduce lumen output?

http://www.greners.com/reflector-test.html

The question is, is space that big of an issue that you want a reflector that reflects light about half as efficiently as most of the common reflectors? I was convinced I wanted a cooltube but did some research and settled on the blockbuster. Could NOT be happier with it!

edit: am i allowed to link that?

Good link, I've always wondered if my cooltube was truly reducing lumen or not. I'll have to get a lux meter and see exactly what mine is doing.

Thanks for providing that link, I have three Xtrasun wing reflectors and it's nice to know I made the right choice and didn't waste all kinds of money on gimmicks and other hoods that can't perform as good as mine. Being in the northlands...bbrrrrrrr... has it's advantages sometimes I guess.

Originally Posted by 40sdroppinhot

http://www.greners.com/reflector-test.html

The question is, is space that big of an issue that you want a reflector that reflects light about half as efficiently as most of the common reflectors? I was convinced I wanted a cooltube but did some research and settled on the blockbuster. Could NOT be happier with it!

edit: am i allowed to link that?

bump for good info. +1

Plants don't use lumens. Lumen are for the human eye.

no but its a good indicator of the PAR the plant is actually receiving....if its receiving more lumens its receiving more everything. badda bing badda boom

Originally Posted by mr2shim

As the title said, I've been searching for a little while and haven't found one piece of solid information that shows cooltubes cut down on lumen output. Not just words on a computer screen, someone using a lux meter to prove this.

It's a piece of glass between the light and the plants.....
It's gonna sap a few lumens, but more importantly it blocks UV light which is a major component in trichome production.
If it means that much to you why don't your do your own research?
http://compare.ebay.com/like/2211174...Types&var=sbar

Originally Posted by 40sdroppinhot

http://www.greners.com/reflector-test.html

The question is, is space that big of an issue that you want a reflector that reflects light about half as efficiently as most of the common reflectors? I was convinced I wanted a cooltube but did some research and settled on the blockbuster. Could NOT be happier with it!

edit: am i allowed to link that?

Yes you can link that