Abstract
The rationale for a constant source of both luminance and illuminance to check photometer calibration is discussed. The inexpensive construction of such a reference source is described, together with some performance data.
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Nilsson, T.H. Reference light source for luminance and illuminance photometry. Behavior Research Methods & Instrumentation 13, 18–19 (1981). https://doi.org/10.3758/BF03201865
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DOI: https://doi.org/10.3758/BF03201865