Grow Room reflection

I am a new grower I just recently painted the walls ceiling and floors all white I will be shortly putting up photos of my closet I heard that white is super reflective and I want to make sure I am correct if this is true how will it help about it I just need some clearification Thanks for any info in advance

GrowRoom Reflectivity

Choosing the right surface for the walls of your grow room is very important, as up to 40% of your total yield comes from the edge, and the right wall surface can increase the amount of light those plants receive by up to 30%!

Artificial lighting diminishes exponentially with distance, so it is important to ‘contain’ as much of this light as possible, and direct it accordingly. Reflective surfaces also help illuminate the lower portions of the garden, providing lower buds with light and heat energy.

To get the best results with your light and walls, it is important to get the walls as close as possible to your garden to ensure the least amount of light is wasted. As a caveat, the percentages provided are only useful as a general guideline, as they present the range of reflectivity of the particular surfaces. The high percentage presents the best possible circumstances for that material (for example a 99% reflectivity rating for mylar sheeting would be under ideal conditions - no creases, completely flat, no discoloration, etc).

The best way to determine how well your grow room walls reflect light would be to purchase a light meter and measure your light directly; then take an opaque board and hold it a few inches off one of your walls with the light meter below the board in such a fashion that the light reflects off the wall and onto the light meter. You can then compare the difference between the two and determine a percentage from those numbers, the closer the two numbers are, the better your wall reflects light. It is important that in both measurements, your light meter is the same distance from the light, otherwise your results will be skewed.

Also important to note is that radiant light energy refers to electromagnetic (EM) radiation with a wavelength between 400-700 nanometers (nm) and radiant heat energy correlates to EM radiation with a wavelength between 800-2000nm.

Listed below are some of the most commonly used materials used for grow room walls:

Foylon:

A more durable version of mylar, made of spun polyester fabric and reinforced with foil laminate. Foylon is resistant to most solutions, won't tear or fade, and can be wiped or washed clean.

A great solution for growers who are interested in long term use, and though it may be slightly more expensive than mylar, its durability will more than make up for its cost. It has the ability to reflect about 95% of the light and approximately 85% of the heat energy, so a good ventilation system should be used in conjunction with folyon.

A recommended method to attach Foylon to the walls would be using Velcro, as it makes taking it down for cleaning much easier nd reduces the risk of tearing, creasing or bending it. If this is used for your walls, making sure you get it flush with the wall with no pockets of air between it and the wall to prevent hotspots.

Mylar:

A highly reflective polyester film that comes in varying thickness, the most common being 1 and 2 mm thick. The 2mm thick mylar while not quite as durable as the foylon, is fairly rugged. The 1mm thick mylar tears fairly easily, so taking it down for cleaning is quite difficult without damaging it in the process. Both types of mylar are able to reflect approximately 92-97% reflective, giving it the potential to be more reflective than foylon, but because foylon is more easily cleaned without damaging it as well as it being harder to crease, foylon usually ends up being slightly more reflective. Important to note is that mylar reflects radiant heat energy just as well as foylon (around 85%), so proper ventilation is necessary if mylar is used in your grow room. Attaching this to walls can be done in a similar fashion as foylon, and the same caution should be used to avoid creating hotspots in your room. The 1mm thick mylar stands a fair chance of being creased or ripped in the process unfortunately, even if Velcro is used to attach to the walls.

C3 anti-detection film: (I'd sleep better at night if I had this.)

A specialized type of mylar that exhibits the same properties as the 2mm thick mylar, but in addition to reflecting approximately 92-97% of the light, it also is 90% infrared proof, making your grow room all but invisible to IR scanning. This can also be attached in the same manner as foylon or mylar, and the same caution should be used to avoid creating hotspots in your room.

Flat white paint:

Self explanatory; a great option for large grow rooms or for people who are interested in a low maintenance wall. Flat white paint has the ability to reflect between 75-85% of the light, and does not create hotspots. Adding a fungicide is recommended when painting.

Glossy and eggshell whites not reflect light as efficiently as flat white. Semi-gloss paint for example, only has the ability to reflect between 55-60% of the light. Also important to remember when using paint is that any smears or blemishes on the surface take away from how reflective the wall is so care should be taken to avoid marking or staining the walls. Titanium white paint is very reflective; however it is usually only used on reflectors due to its high cost.


White/Black plastic (also known as panda plastic or "poly"):

"Poly" is useful if you are setting up a temporary grow room or don’t want to damage the walls. Poly is easily cleaned.

The purpose of the black side is to not allow any light to pass through the plastic, which ensures your dark cycle remains dark. The white side is 75-90% reflective. Choose a 6 "mill" thickness of poly for maximum light blockage and duribility.

If this plastic is put too close to the light, you will obviously melt it so be careful!. Panda plastic does not create hotspots. Poly can be attached to the walls by using carpenter’s nails or using tape glue or similar means. This can be used as a cheap alternative to mylar if painting your grow room is out of the question.

Polystyrene Foam Sheeting (more commonly known as Styrofoam):

This is excellent for harsh environment growrooms (your attic for example), provided you have a good ventilation system and a way to keep the temperatures from rising too high (an a/c unit or similar) as it is an excellent insulator.

It is also a great material for use in a temporary setup or for use as a "travelling reflector" on a light mover, where weight is a concern. It is approximately 75-85% light reflective so it is comparable to using a flat white paint. Foam will not create hot spots. Rigid foam can be purchased in sheets, and can be used as a free standing wall or can be taped, glued or nailed to the wall, the last generally being the most successful method.

Emergency Blankets:

These are ultra thin polyester blankets that are sold in most camping stores and are constructed of a single layer of polyester film that is covered with a layer of vapor deposited aluminum.

It is not very effective at reflecting light because it is so thin. Holding it between you and a light source, many small holes are noticed at the intersections of creases and the entire blanket is translucent to begin with, this coupled with the many creases that are in it when you purchase it takes away a significant amount of it reflectivity. It is very easily creased as well which also detracts from its ability to reflect light. And while it is reflects nearly 90% of radiant heat energy, it is only able to reflect around 70% of the light.

The largest advantage of using this type of material is that it is very cheap and therefore easily replaced. Emergency blankets can create hotspots if not attached flush to the wall so it is important that no air gaps exist between it and your supporting wall. The easiest way to attach this is to use tape (Aluminum or metal tape is recommended), as it tears very easily once it is cut or punctured.

Aluminum Foil:

Aluminum foil is no more than 55% reflective - if used, make sure that the dull side is the one that is used to reflect the light. When it becomes creased its reflectivity is even lower (around 35%.) It is also very dangerous to use because it creates hotspots easily, is electrically conductive, and is a fire hazard when it is in close contact with HID lighting. Attaching this to walls is a pain and usually using aluminum tape or glue is the best way. This should only be used as a last resort, and even then its usefulness is questionable.

wow that was lot to take in lol. My setup is flat white painted room that has been throughly clean and scrubed my concern also is with having this flat white room how does it effect my yield postively? and how much? thanks for the many opitons as well.

Nike617 said:

wow that was lot to take in lol. My setup is flat white painted room that has been throughly clean and scrubed my concern also is with having this flat white room how does it effect my yield postively? and how much? thanks for the many opitons as well.

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i use flat white with excellent results.

oh really thanks for the help

how much do you think it will help my yield everything in the room is flat white walls ceiling floors.

I just helped a buddy last week paint his grow room. We did a sort of semi gloss white paint. We opted for the semi gloss cause that's what he had in the garage and if something does get wet the little bit of gloss in the paint makes for easy clean up. Flat white does seem to be a popular option though.

He isn't growing yet but his lamps are in. It's amaizing what a white room with 4000w looks like when it's running.

oh wow nice yeah dude,im curious as to see how much this will help my yield lol

Nike617 said:

how much do you think it will help my yield everything in the room is flat white walls ceiling floors.

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i swear by it. others will argue.

wow thats quite the grow room lol. im just curious how much it really well

You say mylar creates hotspots, so what if i was to stick the mylar to cardboard and then screw the cardboard to the walls!!! Let me know!! Thanks

on the back of my cabinet i took out the plastic back and put a cardboard one so i can cut holes without messing up my cabinet after im done growing.. but i lined the back with foil tape but it seems to do good to me...

Here is the painted closet I will be sealing the cracks very soon.

True Stoner said:

You say mylar creates hotspots, so what if i was to stick the mylar to cardboard and then screw the cardboard to the walls!!! Let me know!! Thanks

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Will you be able to apply the Mylar to your (ick) cardboard so it is totally smooth and flat without lumps, wrinkles, crinkles, repaired cuts/tears and or patches for repair or to fill possible gaps?
　
If not you may end up with hot spots … but NOT because you chose Mylar instead of a different reflective material.

Every reflective material can create some degree of hot spots if it is not evenly applied.

I use flat white paint right now and it is a great choice but if lumpy and smeared and with runs each one could possibly cause a problem.

There is no way around the possibility of hotspots possibly occurring just by choosing some other reflective material instead.
　
Did you read the information I posted on grow room reflectivity? It tells you the best ways to attach/use different reflective materials.

Regardless of if you follow that information or not what is KEY to getting the most out of whatever reflective material you pick is to get is as even/as flat/as smooth as you possibly can.
　
That will give you the most even reflection and refraction of light you can get with the lowest probability of having hot spots.
　
Of course some materials are more prone to hot spots because of how difficult they are to evenly apply and then also in part to reflective and refractive capabilities so you still want to pick one of the better options, if not the best, but if you pick something that is good to great and you apply it/install it properly you will have little to no fears of hot spots regardless of which of the better materials you chose and you will have good to great as even as possible light reflection and refraction.

oh ok thanks for the help

Nike617 said:

oh ok thanks for the help

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Nothing wrong with hanging material on your walls. But if it's a legit room with drywall or even wood just paint it. It won't fall or tear and it's much cleaner. I think a grow room should feel fresh.

ok its my thread hhahaaha anyone going to answer my question lol

Nike617 said:

I am a new grower I just recently painted the walls ceiling and floors all white I will be shortly putting up photos of my closet I heard that white is super reflective and I want to make sure I am correct if this is true how will it help about it I just need some clearification Thanks for any info in advance

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Somwhere in this run on sentance you are asking if white paint is super reflective.

Yes.

"how much do you think it will help my yield everything in the room is flat white walls ceiling floors."

Is this the question you want answered? There is no answer. I mean, if you never turn on the lights white walls won't do you any good

I have buddies that don't paint their walls white and yield a shit load. I have other that paint their walls and suck balls. White walls helps but is not at the top of the list regarding yield.

ok,im saying I made my grow room comepltly flat white I have a 600 watt hps grow light just wondering how much this will help my yield

Your going to see very little increase in weight ,depending on what you had before,the increased light will help with potency as well beef up your weight a little,I use mylar and cant tell any difference from when it was painted white.This is just standard practice its not something extra