Put a light source at desk level
Overhead light comes from behind you, which means your own head casts a shadow onto exactly the place you are trying to look at. A lamp on the desk lights the work surface directly, from the side, at the height your eyes are already at.
Warm and dimmable matters more than bright. The goal after dark is a pool of light on the desk, not a lit room.
Desk lighting ideas: get the light off the ceiling
Put a light source at desk level.
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