I want to get opinions on which wall covering and/or color is considered best, and why? Did you have an original covering and change and then notice an increase in plant production?
Edit point 2019-08-25.
I Should have asked this maybe as a separate or 2nd question: How far off of said surface will you gain that increase that is being stated. It surly would drop off as the meter is moved away from the wall, right? It would seam to me, that the plant would have to be right next to said wall (orca covering, etc…) to receive any gain from the covering? I can see doing this if your walls are a dark color, or like someone stated I believe, maybe there are no walls, you are making a tent type enclosure, correct? Not trying to be a wise guy, just want to make sure I see it right, or better than I thought I did, If you see my meaning?
Regards,
mike28086
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MiGro did some interesting tests which he posted to YouTube, might be of interest:
Some of the results:
And another he did for Mylar vs white paint:
Results:
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I don’t know, but crisps packets are made of mylar. 
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Actually, Flat white paint radiates the light much better than mylar… Mylar can cause “hot spots” … If your going with the mylar, Make sure the mylar has been layed out flat, without any major wrinkles. Good luck 
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I used orca because of how I set it up. More along a tent idea and it’s lightproof and works well. Would be different if I had walls, depending on money available the white paint is the most economical and does a pretty damn good job.
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I appreciate the replies y’all have given. The links are great.
mike28086
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Uhhh this is a tricky one because either way costs. I personally would use the mylar is does cost more but it rates better. However one layer of Mylar still is not light proof so you would need to back it with something in an application like @MBVapester posted above so either method for light proofing will need two layers for it.
What I think is use black and white it’s cheaper and unless you’ve got help then you’ll never get it fully flat and stretched out to get the 100% benefit of the reflective properties so it doesn’t make that much difference IME.
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@Northern_Loki Great info 
One thing not considered is Panda/Orca film is faster to install than paint & disposable. 
I wonder if the reflective bubble-wrap radiant barrier is close to the fancy schmancy diamond-plate mylar. 
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Kind of like what @Mr.Sparkle has? I was wondering the same thing as you can buy the insulated panels with the reflector on them.
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Personally, I haven’t used any of those products (or paint). I utilize tents (with a diffuse reflective surface) and a “wall-less greenhouse”. I would go with something like the Panda/Orca or other diffuse reflective surface if I were to build a room. At a bare minimum, white walls.
MiGro does a very nice and unbiased job evaluating all sorts of things. Including lights that compete with his brand (with some of the competitors beating his brand).
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That is also a big consideration. Time to preform the task of painting the said room. Mylar, pull it flat, tack it in place, roll on with it. That is a very good point @cannabissequoia, indeed. Thank you for your input.
mike28086
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