Accession Number DE2012-1051990
Title Lumen Maintenance Testing of the Philips 60-Watt Replacement Lamp L Prize Entry.
Publication Date Jul 2012
Media Count 42p
Personal Author J. E. Hathaway J. J. McCullough K. L. Gordon R. P. Hafen
Abstract The Pacific Northwest National Laboratory, operated by Battelle for the U.S. Department of Energy, developed a procedure and facility for testing the lumen maintenance of light-emitting diode (LED) replacement lamps submitted to the L PrizeR competition in the 60-watt replacement and PAR38 replacement categories. The lumen maintenance test apparatus (LMTA), in which lamps are operated continuously in a 45C environment, measures the relative lumen and chromaticity maintenance of up to 200 screw-based lamps. Two hundred samples of a 60-watt LED replacement product submitted by Philips Lighting were measured over a time period of 7,000 hours to determine whether the lamps met the minimum requirements of the L Prize competition. Measurements continue for the purpose of long-term data collection. Spectroradiometric measurements performed by a mobile integrating sphere took place every 100 hours for the first 5,000 hours of operation and weekly (every 168 hours) thereafter. The light output of the Philips L Prize entry lamps has changed very little during the period of operation to date, which surpassed 18,000 hours in July 2012. Average lumen maintenance for the sample of 200 lamps operating in the LMTA is still greater than 100% of average initial output of the lamp samples. The L Prize competition required at least 70% lumen maintenance at 25,000 hours. Based on the data available after 7,000 hours of operation, lumen maintenance at 25,000 hours was projected to be 97.1%. Further, the L Prize competition requirements allowed for a change in chromaticity of no more than .004 as measured on the International Commission on Illumination 1976 (u,v) color space. The average change in chromaticity of the 200 Philips lamps after 7,000 hours of operation was 0.0006. Partly on the basis of this measured performance, the Philips Lighting product was declared the winner of the L Prize in the 60-watt replacement lamp category on August 3, 2011. The measurements performed in the LMTA are relative measurements that track the change in light output and chromaticity over time for the 200 samples operating continuously in the apparatus, relative to their initial output and chromaticity. The results reported here are for the specific product tested as part of the L Prize competition and should not be generalized to other LED lighting products.
Keywords Chromaticity
Fluorescent lamps
Light emitting diodes
Lighting systems

Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 89B - Architectural Design & Environmental Engineering
94E - Environmental Engineering
49F - Power & Signal Transmission Devices
Corporate Author Pacific Northwest National Lab., Richland, WA.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1306
Contract Number DE-AC05-76RL01830

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