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CE numbers on Brikos

post #1 of 4
Thread Starter 
I've got a few pairs of brikos with varying CE numbers written on the lens. Numbers vary from CE .01 to CE .8 -- and are progessively lighter to darker.

Can anyone confirm whether the CE number corresponds to a visual light transmission index, and what percentage of trasmission each number represents? No info on this at briko.com, or online that I can find.
post #2 of 4
CE marking:

Sounds like the number is optical density, computed as log(1/transmission) so .01 corresponds to a transmission of 10^(-0.01) or 98%, similarly .8 corresponds to 10^(-0.8) or 16%.

I don't know whether the CE cert is WRT to the UV spectrum (if they make the claim of UV rejection) or visible-spectrum optical density.
post #3 of 4
Thread Starter 
Good stuff comprex, thanks --
post #4 of 4
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