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ANSI/IES LS-4-20
Lighting Science: Measurement of Light - The Science of Photometry
This Lighting Science (LS) document describes the various types of photometry and photometric instrumentation, including laboratory and field equipment and measurement types, and instructions for some types of field measurements. However, it does not provide instructions or methodology for performing laboratory tests. For that kind of information, the reader is referred to the IES Lighting Measurement (LM) series of documents.
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Illuminating Engineering Society of North America [iesna]
Illuminating Engineering Society of North America [iesna]