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Thanks for your Thanks for the indepth analysis, especially for the history of the varying light transmissions. You won't find the deep rich blue to purple hues you get in prizm sapphire tints that utilize a grey base which provides those particular characteristics. Additionally this makes the FOV purely rose, there are zero amber or orange hues (which would be present if it was grey base tint instead) Additionally the exterior iridium color is near identical to the appearance of DWP with a single solid sheen of bright sapphire. Having owned the prizm snow sapphire goggle lens (its the same tint as sunglasses) it used a prizm rose base, which makes it perform well even if it's pretty cloudy out. heck Oakley can't even decided themselves what it is but they seem to have settle on 13% VLT. So to answer your question, what is the true vlt % of prizm sapphire. Why it went through this weird changing VLT period, I have little to no idea besides some marketing ploy to try an convince folks yes you can actually just survive on one lens because it's able to tackle much more than previous tints could. No idea why, considering most recently they just provided a single VLT percentage per tint type, like it use to be pre-prizm tints. The website later revised it again altering the parameters of the VLT range to be slightly different between those 3 tints. With the key explanation of how is the even possible would be where they introduce their pitch about prizm and how its able to tackle a number of lighting conditions opposed to having to swap out lenses like the old tints going from blue bird weather into sudden snow storm - with prizm sapphire snow I've skied in multitude of conditions without much fuss. Rather Oakley choose to provide a sweeping range for those 3 tints as means to convey the idea that they were versatile tints capable of various lighting conditions. I wondered if they were slightly photochromic at the time because of the supposed range, the Oakley rep explained that wasn't the case. Prizm snow tints sapphire, jade and torch all had the following 10% - 20%VLT when they were first released, it was obviously a confusing spec to read online.