![]() Until the advent of solid-state lighting ( SSL or LED), lighting calculations evolved with the presumption that components could vary within the luminaire. Practitioners use both simple and advanced methods, but in either case, the input must include all of the proper data and adjustments relative to the project. These calculations allow one to predict lighting performance and whether the design meets current performance recommendations. ![]() A discussion of each of the factors and examples of comparative calculations are provided.Ĭalculations to predict lighting system performance are fundamental to the practice of lighting design and illuminating engineering. In order to properly predict the performance of an LED lighting system and to compare results to competing conventional lighting systems, designers must be particularly careful to use appropriate factors in addition to properly using the two different photometric data formats. With LED lighting systems, the photometric test method ("absolute photometry") differs from conventional source lighting ("relative photometry"). Good practice in illuminating engineering dictates that the designer uses photometric data that is adjusted to meet the conditions of the intended application by accounting for temperature, dirt, and variations of components. ![]() « Back to Homepage Lighting Calculations in the LED Eraīy James R Benya, PE, FIES, FIALD, Cree LED Lightingįor decades, lighting calculations have been the backbone of lighting designs for almost all lighting applications, indoors and out.
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