Re: Introduction to LED Lighting Recording Is Up!

Richard Kerschner

Thanks to both Dale and Terri for commenting on the mechanism behind possible color shifts. I have a question for each. Dale, you mention how high-energy UV activates the phosphors. Do they completely absorb the UV or does some escape? The SPDCs show very little if any UV light omitted, so it must be absorbed. The LIA and RIA in-case fixtures that we used also were covered with a polycarbonate lens that would filter UV. I have always questioned whether the zero UV measured was a result of the LED’s simply not generating any UV or that any UV generated was filtered out by a covering lens. Perhaps with the white LEDs it is some of both?

Terri, did you observe a significant color shift over the two months that your rogue LED deteriorated?