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photometer
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photometer

Instrument that measures the intensity of light (electromagnetic radiation in the visible range), usually by comparing relative intensities from different sources. Bunsen's grease-spot photometer of 1844 compares the intensity of a light source with that of a known source by using each source to illuminate one half of a translucent area. Modern photometers use photocells, as in a photographer's exposure meter. A photomultiplier can also be used as a photometer.
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LRC field demonstration results from the past few years in rural and suburban areas of Connecticut, Massachusetts, and Texas verified that by implementing the Unified System of Photometry the street lighting system consumed 30 to 50 percent less electric power and the residents believed they could see better and said they felt safer, when compared to lighting systems designed using the traditional system of photometry.
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