sdsdsdsds

What's the difference between a screen emitting X light as a primary light source and a sheet of paper emitting the same exact amount of light, as a secondary light source ?

The amount of light coming to your retina stays the same..

Just lower the brightness until it matches the amount of light reflected by a sheet of paper placed next to the screen.

If you can't read the paper, turn the lights on. Being in a dark room dilates your pupils which makes them even more sensible to bright light...

I used to code with black themes for a long time but not anymore: Why not simply lower your screen brightness ?

I feel it better for my eyes because the text which i'm looking at is actually dark and not bright.

Most people with dark themes have high brightness levels on their screens. I think this can be bad on the long term. Especially that many screen elements are not as dark as their code, which makes them ultra bright