DOE Releases Third GATEWAY Report on LED System Performance in a High-Temperature Environment

The U.S. Department of Energy's GATEWAY program has released the third report in a series documenting the performance of LED luminaires in the Yuma (Arizona) Sector Border Patrol Area, on the U.S.-Mexico border, which is a high-temperature, high-solar-radiation environment. The first report compared six LED luminaires installed in February 2014 to the incumbent high-intensity discharge (HID) lighting system, and the second discussed the performance of the LED system after 2,500 and 5,000 hours of operation, including unanticipated illuminance changes.

The new report summarizes the results of further investigations to explain those changes. The distribution of light produced by the LED luminaires changed considerably in the first 2,500 hours of operation, and the trend continued after 5,000 and 7,000 hours of operation. Comparing the 7,000-hour measurements to the initial measurements reveals several important changes in the illuminances delivered by the lighting system, including significant decreases in the average horizontal and vertical illuminance.

The suspected cause was dirt depreciation, so two luminaires were removed and tested in a photometric laboratory, first dirty and then after cleaning. The laboratory measurements confirmed the effect of dirt not only on lumen output, but also on the distribution of light exiting the luminaire. The change in distribution raises an important question for manufacturers, specifiers, and researchers: How should lighting system designs account for distribution changes due to dirt accumulation?

For a closer look at the findings, download the full report.

Disclaimers of Warranties
1. The website does not warrant the following:
1.1 The services from the website meets your requirement;
1.2 The accuracy, completeness, or timeliness of the service;
1.3 The accuracy, reliability of conclusions drawn from using the service;
1.4 The accuracy, completeness, or timeliness, or security of any information that you download from the website
2. The services provided by the website is intended for your reference only. The website shall be not be responsible for investment decisions, damages, or other losses resulting from use of the website or the information contained therein<
Proprietary Rights
You may not reproduce, modify, create derivative works from, display, perform, publish, distribute, disseminate, broadcast or circulate to any third party, any materials contained on the services without the express prior written consent of the website or its legal owner.

Nichia’s Tunable 757 receives rave reviews from industry leaders, including the coveted LpS Best Sustainability Technology Award. Nichia, the leader in and inventor of the high-brightness LED, announced its game-changing single LES, tuna... READ MORE

Innovative tunable white, mid-power LED enables luminaire manufacturers to improve colour tuning, shrink optics and fixture profiles, while enabling new design options. Nichia, the leader in and inventor of the high-brightness LED, announces i... READ MORE