How do I adjust luminance levels on my HP Z27x display?
Press any front bezel button, then press the Open Menu button to bring up the OSD menu. Go to Color Space > Adjust Luminance and use the increase or decrease buttons to set it to your desired level between 48-250 cd/m^2 (Native preset supports a wider range). (Page 32)
From the official HP Z27 27 Inch 4K Uhd Display manual, page 32
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