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i think mylar is more for hps or mh
your topping tutorial was brilliant by the way

09-04-2009, 08:52 PM

BKKG

Puts the Can in Cannabis

Join Date: Jul 2007

Location: In the lab

Posts: 802

Re: No reflective material

Quote:

Originally Posted by LBH

I have my Church seedlings in the kitchen under 2 x 200w cfl's. They are just out in the open. Seeing as how there is no mylar or anything, do you think it will make much difference? They say once light is reflected or refracted, it loses a ton of it's punch. I don't want runts so someone straighten me out if I'm wrong

Reflective material does make a difference, but with CFL's the light output degrades pretty quickly and so you won't see the effects as much. I'd say that adding reflective material is worthwhile in general, but it's always hard to say how much it would help. You could do an experiment, with one plant surrounded by reflective material and one with out, and note the differences.

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I'm not a stoner, and I'm not a hippie, but my life is absolutely better with marijuana in it than it was without.

To Growers: The absolute, #1 best thing you can possibly do for your plants is research before you start. Ignoring this is like depriving your plants of light or water-- enough to ruin everything because a vital component is missing.

#5 09-04-2009, 10:30 PM
toastybiz keep it green Join Date: Mar 2006 Posts: 13,108	Re: No reflective material The issue with reflected light is two-fold: First is the total distance the light has to travel, knowing that light energy dissipates at a rate that is the square of the distance. So, if the light travels 6 inches to get to the reflective material and then 6 inches back to the plant, it has traveled 12 inches total. Since CFLs have low light intensity in the first place you should have your plants very close to the light, within 1-2 inches. If that is the case then the reflected light that travels 12 total inches is only 1/144th of the light reaching the plant from the bulb one inch away. Not much to worry about. Second issue is the reflective quality of the material itself. Nothing reflects 100% of light, so all reflective materials reduce the amount of light being reflected (and that is dissipating over the distance traveled). So in the above example you would end up with even less than 1/144th of the light. So you should use something with high reflectivity and really only worry about it if you are keeping the distance the light travels to a minimum. The other side of that coin is very simply this: light that does not reach the plant directly can either be reflected back or lost, and reflecting any amount of light back is only going to be helpful to the plant, even if only in a tiny way. But maybe not worth a big investment when using CFLs. A flat bright white surface actually is pretty reflective and cheap too, so I suggest you put up some panels with white surface, as close as possible to the plants. Don't spend a lot of money for capturing that "lost" light but don't expect it to do much either. __________________ toastybiz Grandpa's grow guide ~ Vokal's grow guide ~ Diagnosing problems ~ Purilite's basic light guide Germination ~ Sid's do's and dont's ~ Buying seeds online head-to-head test Glossary of grow terminology ~ unoit's bubble hash method ~ Another hash method GC Forum Rules ~ NORML: MJ and the law

09-04-2009, 10:36 PM

Allenparsons

Registered User

Join Date: Jul 2009

Posts: 165

Blog Entries: 1

Re: No reflective material

Quote:

Originally Posted by toastybiz

The issue with reflected light is two-fold:

First is the total distance the light has to travel, knowing that light energy dissipates at a rate that is the square of the distance. So, if the light travels 6 inches to get to the reflective material and then 6 inches back to the plant, it has traveled 12 inches total. Since CFLs have low light intensity in the first place you should have your plants very close to the light, within 1-2 inches. If that is the case then the reflected light that travels 12 total inches is only 1/144th of the light reaching the plant from the bulb one inch away. Not much to worry about.

Second issue is the reflective quality of the material itself. Nothing reflects 100% of light, so all reflective materials reduce the amount of light being reflected (and that is dissipating over the distance traveled). So in the above example you would end up with even less than 1/144th of the light.

So you should use something with high reflectivity and really only worry about it if you are keeping the distance the light travels to a minimum.

The other side of that coin is very simply this: light that does not reach the plant directly can either be reflected back or lost, and reflecting any amount of light back is only going to be helpful to the plant, even if only in a tiny way. But maybe not worth a big investment when using CFLs.

A flat bright white surface actually is pretty reflective and cheap too, so I suggest you put up some panels with white surface, as close as possible to the plants. Don't spend a lot of money for capturing that "lost" light but don't expect it to do much either.

Good advice dude, kudos. How can I read more of your posts?

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