The tuftex website has a PDF that gives the light transmission values:
Polycarbonate
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Clear - 93%
Smoke - 84%
Translucent White - 78%
SeaCoaster (vinyl)
-------------------------
Translucent Clear - 75%
Translucent White - 70%
I'm currently building a 16x16 shed and plan to use the polycarbonate smoke as skylights.
Polycarbonate
-------------------------
Clear - 93%
Smoke - 84%
Translucent White - 78%
SeaCoaster (vinyl)
-------------------------
Translucent Clear - 75%
Translucent White - 70%
I'm currently building a 16x16 shed and plan to use the polycarbonate smoke as skylights.