On Aug 27, 2015, at 4:23 PM, Ben Goren <ben@trumpetpower.com> wrote:
The GCATS file
Cancel red alert, as they say. Turns out the XYZ and Lab values were calculated using a spectral measurement of a low-CRI fluorescent lamp as the reference instead of D50, and the measurements below 420 nm apparently have no bearing on reality. Re-calculating the absolute values with D50 gives a very reasonable Lab 96.69498 -0.854171 0.157998, and ignoring values from 430nm and bluer has reflectivity varying only from 90.4% - 92.7%. In other words, it was a number of completely unrelated coinciding unusual things conspiring to mimic the appearance of FWA in the chart, despite there being not even the slightest drop of FWA present. ``We apologize for the inconvenience.'' b&