Views: 11 Author: Site Editor Publish Time: 2018-03-14 Origin: Site
Philips recently wrote an article about Correlated Color Temperature (CCT) and , which in fact is a great help to lighting designers.
LED technology change the way we interpret lighting metrics
LED lighting has evolved from a viable technology to a mass-produced technology in recent years. As this evolution continues, LED technology has moved on. Designing with LEDs is not as straightforward as it used to be with conventional technologies. For lighting designers to fully using the possibilities of LED lighting offers, they must change the way they think about lighting and develop a new understanding of the relationship between commonly used light parameters, like CCT and CRI.
Introduction of CCT and CRI
In order to create desired lighting effects, lighting designers need to be familiar with the different characteristics that express the color of white light. Correlated Color Temperature (CCT) is used to indicate the color appearance (or tint) of white light. However, CCT alone does not fully define white appearance since two light sources with the same CCT value can have very different visual appearances. That’s because the exact position of the chromaticity coordinates also contributes to the perception of whiteness.
is a fidelity index that indicates how close the colors of objects appear when illuminated by a test source in comparison to a reference illuminant. CRI 100 is the maximum value, meaning that the light is as close as possible to the reference light source. Lower CRI values indicate that some colors may appear different when compared to the reference light.
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