I agree...my perception of light transmission is likely impacted by what I am calling transmission...it might not be actually be light transmission at all (it is hard to argue with "science") and is as you mentioned is most likely a combination of things...
It might very well be the difference in color (warmth or coolness) that these different eyepieces impart (or don't impart) or some other factor.
Regardless of what it actually is users do see "some" difference...or at least some of us "think" we do... Cheers!
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