VLT% is not nearly as useful a number as many think it is. It's possible to have any VLT in any tint, but the light transmission profile (LTx) is what actually determines the user experience.
Tungsten is the Iridium version of Bronze. It copes well with glare because of the Iridium coating, and the brown base lens has that yellow component to it. This is a common advantage of brown lenses over grey ones.
Prizm tends to standardize the FOV of the neutral base Iridium lenses. Sapphire without Prizm has a far more yellowy-green tint, and Prizm makes it rosy instead.
With Tungsten the lens itself is brown, so the LTx is already different, with a larger yellow component. The Iridium coating does not have the same relationship with the lens itself.
I can't see any Iridium coating on my Prizm Tungsten lenses. If it's there, it's so subtle that it can hardly be seen with the naked eye. This also means that anyone can see straight through them from the outside, which is a little bit annoying.
Got the Prizm Black Polarized today and it was a total disappointment. They are just plain gray with no "pop" to colors what so ever. My plan was to replace the Sapphire Iridium with PBP, but that won't happen. Oh well...
Edit: The problem with Oakley is that they don't provide reliable specifications to their customers. The LTx are very hard to find and the descriptions on the site are mostly just wrong (mixing up lens base tint with Iridium coating color).
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