Understanding LED tests:IES LM-79, LM-80, and TM-21 IES TM-21-11 Projecting Long Term Lumen Maintenance of LED Light Sources Publication of this Committee report has been approved by IES. Suggestions for revision should be directed to IES DOE SSL Workshop
July, 2011
Eric Richman
Pacific Northwest National Laboratory
Program Name or Ancillary Texteere.energy.gov
IES LM-79
Electrical and Photometric Measurements of Solid-State Lighting Products?Approved method describing procedures and precautions in performing reproducible measurements of LEDs:
––––
total flux,
electrical power,
efficacy (lm/watt), and chromaticity
1| Solid-State Lighting Program
www.ssl.energy.gov
LM-79 Scope
?Applies to LED-based products incorporating control electronics and heat sinks:
–Products requiring only line voltage or DC power supply
–Includes complete LED luminaires and
–Integrated LED products (LED chips with heat sinks)
?Does notcover
–LED products requiring external operating circuits or heat sinks (bare LED chips, pkgs, and modules)
–Fixtures designed for LED products but sold without a light source
2| Solid-State Lighting Program
www.ssl.energy.gov
LM-79 Absolute Photometry Basis
?LM-79 requires complete luminaire testing
?Traditionally, photometric evaluation of lighting products is based on separate tests for lamps and luminaires (“relative”)
?For SSL products, LED lamps typically cannotbe separated from their luminaire because of heat effects (“absolute”)
3| Solid-State Lighting Program
www.ssl.energy.gov
LM-79 Procedures/Conditions
?Ambient conditions
–Temperature –maintain at 25C +/-1C (within 1m)–Mounting –limit thermal transfer–Air flow -limited
?Power Supply characteristics
–AC waveshape limit to harmonic RMS of 3%–Voltage regulation to +/-2%
????Seasoning and stabilizationTesting orientationElectrical settingsInstrumentation
www.ssl.energy.gov
4| Solid-State Lighting Program
DOE解读IES LM79,LM80和TM21的差异 - 图文
