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  • Wuxi Kinglux Glass Lens Co.Ltd
  • ADD:No.286,Changjiang North Rd,New Dist,Wuxi,JS prov,China
  • Tel: 86-510-66759801
  • Fax: 86-510-84602998
  • Mobile phone: 86-18168862789
  • E-mail: ledglasslens@163.com
  • Contact person: Huimin Zhang
  • Lumen Output Testing for LED Lights
    Apr 20, 2018

    The Illuminating Engineering Society of North America (IESNA) has developed two lumen output test standards that quality LED lighting manufacturers are using. The first standard, known as LM-80, measures an LED light’s lumen maintenance and depreciation over time. This standard simply compares the lumens that an LEDs generates when it is new to its lumen output at some specific future time. The test protocol includes temperature and other environmental characteristics to verify that LED lights are tested in standard conditions during each test.

    Two LEDs that have identical initial lumen ratings, for example, can have dramatically different ratings after 30,000 hours of use. An LED lighting manufacturer whose products have been subjected to an LM-80 test, for example, might include a rating on the LED package stating that the light is rated at L80 after 30,000 hours, which means that the LEDs will continue to generate at least 80% of its initial lumen output at that usage point.

    The second standard is a TM-21 test that extrapolates lumen maintenance information to tell the LED consumer how the lamp can be expected to perform after the LM-80 test specification. TM-21 extrapolations can give a consumer generally reliable information on how a light will perform between 30,000 and 60,000 hours. Both standards have their limitations, but an LED lighting manufacturer’s ability to provide this information allows consumers to compare different manufacturers on a more objective basis.