Tom Clancy's Ghost Recon: Wildlands - HDR Settings

The peak brightness in the game seems to be fixed and not adjustable. This game does not seem to use the PS4, PS5 & Xbox HDR system calibration settings. 

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The brightness of the light sources reaches 1300 nits. But the game has a very bright user interface. Some HUD elements are 10000 nits bright. Use the tone mapping modes of your TV.