Product Selection Guide Page 1110 Product Selection Guide-11th Edition

1110 PRODUCT INFORMATION Color Quality LED TECHNICAL INFORMATION PSG11 TECHNICAL INFORMATION www.acuitybrands.com Color Rendering Index Light sources differ in their ability to accurately portray the true colors of objects. So, while color temperature is an important characteristic of how the source appears, CRI is a characteristic of how the source interacts with its environment. By definition, the ability to accurately "render" all colors by a full-spectrum source such as sunlight (or an incandescent lamp) is defined as 100%. Through a sophisticated set of calculations, the reflected color of the samples under the test lamp is compared to the color of those same samples under the reference incandescent lamp. The aggregated set of numbers is reported as the lamp's CRI value. It is important to note that the lack of saturated colors in the current CRI definition has driven artificially low values for the LED light source. Color Quality The National Institute of Standards and Technology (NIST) is currently in the process of creating a new color rendering standard which will be known as Color Quality Scale (CQS) and will address deficiencies of the current standard. While the establishment of a new color scale may take some time, it is important to note that deficiencies of CRI are not specific to LED light sources. The scientific migration away from CRI as the definitive metric has been underway for several years as other new sources (ceramic metal halide, induction, etc.) have found that the color rendering index is not complete enough to capture the human visual experience. With LED lighting, it is therefore recommended to use CRI as a starting guide. The judgment of suitability of the system's color quality is ultimately best experienced in the actual application. 15 color swatches for CRI Source: National Institute of Standards & Technology (Continued) COLOR QUALITY For more information about the development of CQS: http://www.nist.gov/pml/div685/grp03/vision_color.cfm

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