this post was submitted on 14 Jul 2023
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Explain Like I'm Five
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The reason is that the assumption 'no other light sources aside from the screen' is almost impossible to control for. You'd have to be in a room with no daylight coming in and zero other blue light sources emitting from say a smartphone, clock readout, artificial lighting for the room and/or any of its appliances.
Even accepting this ridiculous decision to rule 'all other sources of light out of scope' then the obvious only possible answer is that THE SCREEN EMITS BLUE LIGHT OUTSIDE THE CONTROL OF SOFTWARE COLOUR SETTINGS. For example, LCD screens use a white light bulb to light up a screen of LCD pixels. This white light leaks. It's why LCD screens have lower contrast (black looks dark grey).