"you delivered the meter the exact same intensity light"
Quick answer before I go to bed -
I gave the meter light from a tunsten bulb of approximately 2800K color temp. The light then passed through the spectrophotometer which using a diffraction grating, split that 2800K light up into individual wavelengths. Then meter then made readings at the wavelengths indicated in the chart.
Your hypothetical "ULM" will always be at the whim of whatever light source it is reading. SO you need to compare the graph I presented with a graph of a 2800K light source and look for the differences. THe differences will be due to the spectral characteristics of the meter.
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