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As a suggestion to help you with your quest - try polarised sunglasses. I used them with my M1 mac this summer quite successfully! The macbook screen is polarised so that the screen light goes straight through the sunglasses, while the surrounding sunlight gets dimmed.

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Yes, I noticed that sunglasses help, but they still darken the screen a bit because of their tint.

This is a video I took last summer on this: https://files.alinpanaitiu.com/ff-polarized-macbook.mp4

What specific glasses are these? I'd guess that the direction of the polarisation of the glasses makes a big difference

I think polarized sunglasses are always vertically polarized, to block glare off horizontal surfaces.

Correct. This page explained it nicely: https://nigerianscholars.com/tutorials/wave-optics/polarizat...

"Vertically polarized light is preferentially refracted at the surface, so that the reflected light is left more horizontally polarized" and you use vertically polarised sunglasses to filter out the reflected horizontally polarised light.

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