How Reflective Are Mylar,white Paint,white Plastic Etc? Options

[sillyc]

Hey guys, Just wondering if there's anyone on this forum that has figures to show which reflective material is best for growroom walls ? Like the % of light that they reflect ? thx.



Sillyc

[compostverte]

The way I look at it you only really need a foot or two of anything from the reflector to the canopy - since leaves tend to move to suck up the light.

I used vinyl silk in my present cupboard - which breaks all the rules but is very practical.

I also sometimes use foil - which is pure heresy.

[compostverte]

That's the conventional wisdom, but I've seen no evidence at all.

Perhaps it's because my lamps aren't very powerful ?

And mylar is short for aluminised mylar

This post has been edited by compostverte: Jan 11 2008, 10:34 PM

[_Yoda Indica_]

mylar = 99% reflectivity
white plastic , 80%
alu-foil was sth like 65-ish % if i recall correctly

YET in some situations , like thick brick walls, i would chalk up walls with whithe chalk every year...
the pores of walls tend to hold and release humidity , which stabilizes, allowing u to grow just as fat nugs

i dont know about polystyrene sheets,% wise, but they diffuse light very nicely ..and are perfectly white..

so there u go

(white paint also strilizes a bit , by locking up all that is on the wall...cleaning with 5%bleach in water before painting is always good though)

hope this helps

This post has been edited by Yoda Indica: Jan 11 2008, 11:42 PM

[Stealth67]

Mylar 99%

http://en.wikipedia.org/wiki/PET_film_(biaxially_oriented)

Cover absolutley everything with the stuff, it works in reflecting light to the sides of your grow as well.

[Anasrzi]

ive just got plain white in a grow tent gona bring in mylar mounted on cardboard to keep it rigid dont want any kinks in it was finkin of tryin new diamond pressed mylar its supposed to reflect the light into different waves or sumfin anyone tryed it fink il give it a whirl

[Stealth67]

"Mylar" as an acoustic/thermal insulation material has gained some public attention due to its unfortunate involvement in the Swissair Flight 111 crash as the material was found to be flammable in the subsequent investigations.

The investigation identified eleven causes and contributing factors of the crash in their final report. The first and most important was:

Aircraft certification standards for material flammability were inadequate in that they allowed the use of materials that could be ignited and sustain or propagate fire. Consequently, flammable material propagated a fire that started above the ceiling on the right side of the cockpit near the cockpit rear wall. The fire spread and intensified rapidly to the extent that it degraded aircraft systems and the cockpit environment, and ultimately led to the loss of control of the aircraft.

Who would have thought Mylar had such a horrific past ?