I was trying to figure out how to quantify glare the other day and found this:

Unified Glare Rating UGR basic explanation.

Pretty clear, right? If not, just buy the poster.

A more useful page for the laity, perhaps, is this explanation of light diffusers:

Light Diffusion and Light Diffuser Types

There are more easy-to-follow explanations on the Fusion Optix blog, but sadly it appears they’ve stopped updating it.

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