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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).
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.
A test pattern generator (left) and colorimeter (right) used for measuring TV brightness
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Portrait Displays' Calman software is used for running and recording TV brightness measurements