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Words and images by @SuperFunker. Part 2, Lumens Lumens is a measurement of total light emitted by a source, but it's only a narrow representation of the PAR spectrum. As defined by the LI-COR LI-210R Photometric Sensor, the spectral response is a weighted measure designed to rationalize light associated with peak human sensitivity (555 nm). This is ideal for testing household, office and public lighting, but it's a limited gauge for assessing the intensity and effectiveness of horticulture lights. Consumer Interpretation of Lumens Although lumens primarily measure the intensity of green and yellow light, it's possible to glean a couple...

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