Thanks for sharing, Alexey!
In the past I used LCD monitor without matrix (it was damaged, but lamp
itself was good, so I just remove the matrix and used it as a light table).
But the uniformity and stability is not very good, so it was necessary to
calibrate i1Pro every few patches.
Now I'm using iPad (!) and found it much more stable (auto-brightness=off).
But calibration every 10-15 patches is also highly desirable. It's
necessary to get really repeatable and reliable values.
I'm calibrating device during measurements in two different ways:
1. I'm making ArgyllCMS native calibration every 75 patches.
2. I'm measuring white patch every 15 patches and making linear spectral
correction afterwords in EXCEL.
Alexey Gribunin, UNIT Color Technologies, Moscow, Russia.