Photometry is the science of measuring light and its properties as perceived by the human eye, providing the methods and units used in lighting measurement.
Photometry is the branch of science concerned with measuring light and its properties as perceived by the human eye. It defines the methods and units, such as lumens, lux, and candelas, used to quantify light output, illuminance, and intensity. Photometry weights measurements according to the eye's sensitivity, distinguishing it from purely physical measures of radiant energy.
The principles of photometry underlie all lighting measurement and design, providing the objective basis for describing how much light a source produces and how it is distributed. Photometric data and measurements derive from these scientific foundations.
The fixtures and systems evaluated through photometry depend on stable power and, in many cases, control wiring to deliver consistent output. The supporting cable must be rated for the circuit so fixtures perform as photometric measurement indicates.
Because the principles of photometry underlie all lighting measurement and design, they provide the objective basis for describing how much light a source produces and how it is distributed, from which photometric data and individual measurements ultimately derive.
Recognizing how photometry provides the objective basis for lighting measurement helps illustrate the science behind the photometric data and units used in lighting design.
These scientific foundations give lighting design its objective footing, defining the units and methods from which photometric data and individual measurements ultimately derive.
At Windy City Wire, the focus on low-voltage power and control cable supports the lighting systems whose performance photometry measures. Supplying dependable cable helps ensure fixtures deliver consistent output, so their measured performance reflects the principles of photometry.