Printable View
I am currently in the process to spec out a closet and get it ready and was wondering if I could use mirrors on the walls for a reflective surface. Is this a good idea? - would just use mylar however I don't know where I can purchase some in my area and not really wnating to order online?
Look up hydroponic stores in your area, mirrors DO NOT work. They absorb light actually and can cause hot spots.
Go to walmart and get emergency blankets, if people say they don't have them, they are wrong, go to the camping section and look around, in a box about the size of a deck of cards, was around 2.99 here, some have said they are cheaper.
Mirrors actually absorb light, the glass when first exposed to light, the light goes through and gets refracted/absorbed(more just distributed through the glass) then reflected off the silver backing(which is a good reflector) but then back again through the glass.
-C
flat white paint...:thumbsup:
or if you have some dumb friends like me you can get a coulple of those boxes for only 5 bucks..Quote:
Originally Posted by ForgetClassC
to them they get the 5 finger discounts.
one box is fine for a good size growbox but more is better ....
+1. easy to apply, easy to clean. and still highly reflective. :thumbsup:Quote:
Originally Posted by Dutch Pimp
White paint is good, but only has a coefficient of reflectance of .8 , meaning that its only 80% reflective. But Mylar(aka extremely thin layers of silver/aluminum on any of a number of polymers) has 2 good properties. 1) contains all UV energy/rays and is about 97% reflective, having a CR of .9
But white paint is very easy to get, install(paint/spray), and manage. If it gets dirty, put another coat on it.
-C
biggest problem with mylar; it reflects the heat, too...(Weedhound proved that to me; she switched from mylar to flat white paint; 1000 HPS lighting, temps dropped ten degrees)...:pimp:
I assume the Emergency blankets do, too?...or they wouldn't keep you warm...:stoned:
Indeed, but with the mylar, if you have adequate ventilation, say a cool tube, and then you can efficiently move that air away from the room/box to a safe location, say you splice it into your HVAC and then boom, you just have a vent that is on different times of the day then the rest........
-C
I prefer flat white paint but have friends who buy up mylar Christmas wrap at this time of year. never use mirrors.Quote:
Originally Posted by jtsik330
wow Mylar christmas wrap? I guess im the only person who just doesn't know what mylar is?Quote:
Originally Posted by seventhchild
If Dutch Pimp is correct about mylar reflecting heat then maybe it wont be a good idea for me to use mylar. I kinda need some of the heat from the lamps to keep my temps up I think. I'm in the process of making a grow box with 8 26 watt cfl am thinkin if heat will be an issue?
I use a 200w fluoro with mylar, about the same wattage as your setup but one bulb instead of 8. It raises the temps about 25 degrees in there without ventilation. As long as you get a good fan and venting setup you should be good to go.
Never seen mylar x-mas wrap but the stuff I got from the hydro store feels just like it so I can see it possibly being sold as that.
REALYY!!?? I did not think that those 8 bulbs would produce that much heat. Each bulb is rated at 1600 lumens and the dimension of the box is 18x16.I was thinkin bout starting with 6 small pots in these dimensions and then divide the six in three and place in seperate boxes?Quote:
Originally Posted by redtails
Any sugguestions?!:o