I am calibrating some production monitors. I ran a profile and created a Lut. I verified using active Lut and got a delta E of 2. When I uploaded thad Lut to the monitor and profiled it had a delta e of 12. What could account for this difference?

Please see the User Guides.
Specifically the Calibration Issues page, the Active LUT vs. LUT Upload section.
All is explained there: https://www.lightillusion.com/calibration_issues.html#active_vs_upload

Steve

Thanks! Is a difference of 10 normal?

There should be no difference at all, or at most a small variation due to rounding errors, etc.

Steve

Thanks for the info. What would account for such a large discrepancy then?

Have you read the guide linked to?
https://www.lightillusion.com/calibration_issues.html#active_vs_upload

Steve