my 600 watt setup, need opions!

Gastanker

Gastanker

Well-Known Member
That's a pretty good deal on the mylar. Make sure to spray adhesive the mylar to whatever backing you are using. It looses considerable reflectivity when not closely backed - pictures illustrating this in the link at the top of the page.

If you want something you can actually make the walls with that's also reflective check out black and white poly - http://www.google.com/products/catalog?q=black+and+white+poly&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&tbm=shop&cid=15811289018825404338&sa=X&ei=ee9oT_jRO8SuiQKI7dTyBg&ved=0CFcQ8wIwAQ

Mylar alone is see through but this stuff blocks all light and can be cleaned without degrading.
 
dopeman442

dopeman442

Member
thank you for ur info, if mylar creates that much heat and and its seethrew then im gonna buy the black and white panda film, because i dont like ordering shit over the boarder, idk makes me kinda nervous and my tent is see threw with light, so i guess black and whilte panada film will do great, i guess ima buy these black and white panada film, do yu think its a good deal http://www.bustan.ca/product_detail.asp?menuID=4&SID=29&PID=1131
 
Gastanker

Gastanker

Well-Known Member
I don't purchase it very often so I can't offer a suggestion on pricing. I do however know that you can often find it at hardware stores like Home Depot and Lowes. Might be able to find it locally for cheap. Just a thought.

And mylar does not create heat...

All of this applies also to mylar - it's used in space blankets because it reflects all of your body heat back to you - reflects near 99% of IR (heat):

Foil is used in cooking because it reflects heat. By reflecting heat foil ensures that your food is evenly cooked at the ambient temps versus unevenly cooked by directional radiant heat. If you measure a white wall with an infrared thermometer it will be considerably warmer than the same wall with a piece of aluminum foil on it as the foil reflects the heat that the wall would otherwise absorb. Foil acts the exact same heat wise as mylar: If you line your grow room in foil the foil will reflect the majority of the heat back into the room versus letting it be absorbed by the walls; This can be good and bad: if you do not vent your room the air temps will get very very hot (bad). If you have thin white walls they can act as a heat sync in which case foil wouldn't help you much temperature wise. However, if you have thick walls and do vent your room you can keep room temps lower with foil than with white paint - heat is retained in the air temps which is quickly vented off and the walls which normally would act as a heat bank are shielded from the IR - All of this applies to mylar vs white paint in the same way.

Of course that being said I would still recommend the poly.
 
wheels619

wheels619

Well-Known Member
Gastanker said:
Wait a second... first it was foil burned plants because it dimples and now it burns plants because it's flat?

Mylar is flat and more reflective than foil!! AHhhhHHHhHHH! One time a mylar wall burnt down my house and then the super bright beam hit a plane and caught it on fire and then hit a satelite and burnt it up!! AhhhHHhhhHH!!

You guys crack me up. FOIL CANNOT BURN PLANTS or anything else any more than mylar, polish aluminum, white pain... Way too funny. Read a physics book. This has got to be the silliest rumor of them all as I guarantee you no one has ever seen a plant burned by aluminum foil. The generally accepted ranking of reflective surfaces is thus - Polished aluminum, closely backed mylar, aluminum foil, white paint. This is the generally accepted ranking based on many many light related forums (indoor gardening, aquarium... not just RIU) If polished aluminum is more reflective than foil then why would a dimple in polished aluminum not burn a plant? Why wouldn't a dimple in mylar burn a plant?

The thought behind foil burning plants is that it wrinkles easily and that a tiny tiny wrinkle can focus enough reflected heat that the heat burns the plant. So if you take the same small wrinkle in foil and create it in mylar (which reflects more heat than foil) then the mylar would burn the plant even more - same applies to polished aluminum. I keep my dimpled polished aluminum reflector 4" from my plants... Wouldn't a dimple ~6" from my plant and 2" from my bulb focus more light than a dimple in foil several feet from the bulb? Why doesn't my light burn all of my plants? This is super super simple people. Hell mylar creates large parabolic dimples more often than foil - a larger parabolic dimple in mylar would reflect far far more heat onto a single small spot than foil could ever accomplish.

I personally created a large parabolic dish out of foil in attempts to burn a plant and had no success. With a large enough mylar dish though... that's some heat.

The argument that it is dangerous because it is flat is even crazier. Light reflects at an equal and opposite angle off of flat surfaces. There is no way a flat surface is ever going to concentrate enough light onto one point to create a heat build up. This is like elementary school stuff...
Click to expand...
jesus christ. did u read anything i was saying or did u just browse thru it?

its a completely different material. with completely different properties than foil.
 
dopeman442

dopeman442

Member
Well, ima stick with the foil untill "i notice it burns the plants" and plus im using the doll side not the shiny part, and plus i got a hydro shop 20 mins away, i always can get panda film or mylar or whateever, so im not to worried about that part
 
Swisher Sweet

Swisher Sweet

Active Member
Always your choice. For the almighty scientist/physicist/whatever I've seen the results of what I believe to be burned plants as a result again of what I believe to be the use of foil. I am not uneducated just for your own knowledge and I've read plenty of books including a physics book but I don't remember that chapter. Part of the scientific process is observation. Maybe you forgot that. Anyway, this site has always for the most part been very informational with those that participate being helpful and non-condescending for those without great knowledge but wanting to learn. I am by no means an expert but always trying to learn. Somebody with your apparent knowledge could be that kind of person but instead you act like a JERK. Think about it! Enough of this apparent waste of time.

I now realize you actually did try and help the guy With the Mylar which I think is the best remedy for his situation. KUDOS!
 
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