Allow me to take that statement coming from a company that produces a competing reflective film product as not being entirely partial. But let's say for a second it does suck.
I am not expert in light, but I think there is a good reason why companies use aluminium or equivalent reflectors made of non white color. Cost perhaps? Now, will engineered white paints or white reflective material reflect better, maybe. But realistically speaking the OP is simply asking if he should paint his reflector in white and the chances that he uses a specifically designed product that will reflect light better are probably infinitesimal small. The assumption here is that he would use the old plain wall or spray paint which I don't see that reflecting light any better, most probably reflecting it worse. Just my opinion. I could be wrong.
Right, like I stated.. it was the geomoetry of the reflector not the substance.
Sorry the white thing is a tangent I probably shouldn't have ventured on..
As to companies.. well a white finish, even if better than polished aluminum probably won't look very good after awhile and maintenance is more difficult. Think chipping paint ect.
Certainly easier to clean and polish than white Ba laced paint.
To use something even better than both.. teflon coated reflectors would be prohibitively costly.
Industry RARELY uses "the best" just the most practical.. and then markets the heck out of it.
The vid you posted (only scanned it) shows about the difference between flat white and "the best" is about 10%
10% of 1000 "PAR" is 100.. Think there is much difference in growth between 1000 and 900 PAR?
Some crops maybe, some not so much.
Cannabis is a LIGHT HOG and can take par far exceeding what other plants could tolerate in the long run.
Even then probably splitting hairs.
Compare Grow Room Wall Coverings: Mylar vs. White Paint vs. Vinyl GrowWall™
BTW: Don't agree with his numbers as to Mylar and paint but the text is interesting..
PET films are "mylar"
Keep in mind it is an advertising blurb..
plastic microfiber technology creates highly reflective and diffuse reflection over full visible spectrum; eliminates hot spots and creates an even, efficient distribution of light on plants in gardeners hydroponic grow room. Yield increasing product outperforms metalized foil products like...
www.orcagrowfilm.com
The chart below demonstrates the reflectance vs. wavelength performance of several popular brands and materials used in hydroponic grow rooms. Metalized Polyethylene Terephthalate Film was first developed by DuPont in the 1950's; originally branded as Mylar, it is now commonly known as PET film and manufactured all over the world. Many products in the hydroponic industry are associated with false or misleading performance claims, and this is true of reflective films. PET film products are marketed to hydroponic consumers with performance claims as high as 99% reflectivity, despite historically testing in the low to upper 80% reflectance range in the visible spectrum.
(More)
BTW: ORCA is white..
New yield increasing microfiber reflective technology for hydroponic gardeners and grow rooms outperforms mylar, foylon, poly film and metalized foils from easygrow.
www.orcagrowfilm.com