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I will only give a very short answer now.
A surface lit by a lamp also reflects back.
Your argument is wrong.
In terms of light there is 0 difference - and that is physically / optically proven and not a subjective impression.
It's very easy to check.
When the built-in light illuminates a black screen, just as much is reflected from it as when this (unlit) screen is illuminated by an external lamp.
Last edited by ottischwenk; 11-07-2020 at 02:02 PM.
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