White Paper | IP, Reports & Roadmaps | Oct 28, 2013

DOE Publishes Report on Color Stability of LED Lighting Products

The U.S. Department of Energy (DOE) has published a new report, Color Maintenance of LEDs in Laboratory and Field Applications. Although concern for parametric failure of LED lighting products has largely been focused on lumen maintenance, color shift is a cause of early failure for some products, especially in applications where visual appearance is critical.

The report discusses field data from DOE's GATEWAY program showing that many LED lamps installed in museums have changed color beyond a reasonable tolerance well before their rated lifetimes were reached, and laboratory data from DOE's CALiPER program indicating that many early LED products shifted beyond acceptable tolerances in as short a span of time as a few thousand hours. But it also notes that testing of the L Prize®-winning lamp has shown that commercially available LED products can have exemplary color stability unmatched by traditional light sources.

The report also discusses the metrics used for communicating color shift, and provides guidance for end users on how to monitor chromaticity and what to look for in manufacturer warranties. Also covered are the physical changes that have been shown to lead to color shift in some types of LED packages. As with lamps and luminaires, the data presented for LED packages shows that a wide variety of products are available. In order for specifiers and consumers to make educated choices, more detailed and standardized information is necessary.

For details, please download a PDF copy of the report.
For other Solid-State Lighting GATEWAY Demonstration Results please visit http://www1.eere.energy.gov/buildings/ssl/gatewaydemos_results.html or the DoE SSL website

FEATURED

Edison Released Brand New DOB III Series Products

Edison Released Brand New DOB III Series Products The DOB III series increased the efficiency, dimming smoothness also provide ultra- low flicker function (flicker 5% and even 5% during dimming). It is compliant to the 2021 European flicker standard IEC TR61547( PstLM) and to CIE TN006 (SVM) on request. It can be applied in many different lighting ... Read more »

FEATURED

Versatile and Ultrafast – The New CAS 125 Series of Spectroradiometers for LED Production

Versatile and Ultrafast – The New CAS 125 Series of Spectroradiometers for LED Production Instrument Systems – a well-known manufacturer of light measurement technology – works closely with its customers in the field of LED production to develop modular and flexible components for quality inspection in mass production environments. For the new spectroradiometer CAS 125, Instrument ... Read more »