Quote Originally Posted by ic-racer View Post
Thanks for viewing the thread.

Don't read anything in to x-axis variables on those graphs. The x values are just "numbers" or "units" not Lux-seconds. The sensitometers all have different intensities and exposure times and I'd consider the relative right-left position of each curve on the x-axis in the graphs to be random. This was not a film speed test. (That is to come, stay tuned!)
I fully recognize that the intensity of these instruments may be far different. I should have made that post of mine conditional in that respect. Sorry.

If you have any degree of congruence in intensity at one selected wavelength or group of wavelengths, then if the speeds differ in the exposed films, then the spectral output of the group of instruments varies.

Since we see that here, then either the absolute intensity of each device varies or the spectral output varies.