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Rob: Very interesting to me too, I have been notified by fellow Paneristis, that the Sandwich lume "lasts longer in the dark". Apparently, this seems to be very true.
What I heard was they use a thicker lume under the black dial, hence absorbing much more light and giving out better light in longer periods of time.
I'm not sure that is exactly true or technically true, but apparently there is a noticable difference.
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