Does anyone have an indoor transmission value for a trivex transion Xtractive lens? thanks
Does anyone have an indoor transmission value for a trivex transion Xtractive lens? thanks
http://trade.transitions.com/resourc...eetandFAQs.pdf
According to the above, Transitions XTRActive has an average indoor light transmission of about 90% when coated. Average is undefined but probably means medium to low index of refraction materials. Fade time is not noted.
Using Fresnel's law, (n-1/n+1)2, each surface of a Trivex lens will reflect 4.4% of light. Subtract that from the 90% coated figure to find that an uncoated XTRActive light transmission is roughly 81%.
Science is a way of trying not to fool yourself. - Richard P. Feynman
Experience is the hardest teacher. She gives the test before the lesson.
this is the transmission of a 0/0 xtractive measure after 10 minutes in office light
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