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There are two main reasons why brightness is important in thebest TVs.

The second reason has to do with high dynamic range (HDR).

TechRadar reviewer measuring TV brightness with test equipment

A test pattern generator (left) and colorimeter (right) used for measuring TV brightness

To effectively convey that level of highlight detail, a TV must provide sufficient brightness.

Peak brightness is partly important to help create an accurate depiction of HDR movies and TV.

The HDR format Dolby Vision is designed to handle tone mapping on dimmer TVs better.

test equipment used for measuring TV brightness

A test pattern generator (left) and colorimeter (right) used for measuring TV brightness

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Calman software screen used for measuring TV brightness

Portrait Displays' Calman software is used for running and recording TV brightness measurements