Measuring LEDs always ends with “Instrument access failed”

[Benik3]

Hello.

I’m working on a type of ambilight and I wanted to make gamma correction and 3D LUT for my LED strip (WS2813) to get ideal colors. So I got an idea, that I could measure the output of the LEDs with colorimeter and DisplayCal.
I have at home Eye Display 2 colorimeter., but the measuring always ends with error “Instrument access failed”. What’s weird, that it always happen on measuring of dark red.

If I try to measure my monitor, it’s working fine. What is also weird, that I did same thing years ago with same equipment and it worked.
In attachment you can find log with enabled debug output.

Any idea?
Thank you

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[Benik3]

It looks like the i1 Display 2 has some problem with the LED strip.
I tried official iDiagnostic. It success, but measuring of red also took much longer then other colors with LED strip. With VA display it’s fast as other colors…

[Author]

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