That dark canopy can be ordered in place of the standard through Van's
I ordered a bit darker tint to the canopy. The tint I ordered is 67% transparent--70% is the requirement for certified A/C. The tint number is #2514.-I did this when ordering my finish kit for the 6A
Since I have both consider me an expert.
Its no problem with my level of tint mentioned above. I went through several night flights before I even realized that I was supposed to remember to pay attention to it. Your eyes adjust and I do not notice ANY difference, although clearly there is.
What you do notice is the "bake factor" being significatly lower in the tinted. I know nothing about UV-A, B or F. I only know that my head thanks me, and My wife, who is very sensitive to sunlight, loves the tint. Takes better pictures from the inside too and there is much less glare from the inside reflecting around to screw up your nice picture.
I do not know what the downside is of a light tint is. I only know upside for me.
I flew in two -8's this weekend back to back...Mike's Super 8 and "Barefoot Billy's". Billy has the standard tint canopy and for me the difference was very noticeable, particularly on the back of my neck.
Van's Standard canopy is tinted. The clear would be an option which Van's states is a rare order. You can also order a darker tinted canopies from Van's. One is not legal for night flight per Van's... Also a very rare order.