Interpretation of the latest American Energy Star IES LM-79-19 standard

LM-79-19 English Version Free Download: Click Here
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LM-79-19 Chinese Version Free Download: Click Here

ANSI (American National Standards Institute) and IES(Illuminating Engineering Society of North America) officially released the latest version of the IES LM-79-19 standard in May 2019, it will replace the LM-79-08 version. LISUN interpreted the new standard as follows:

1.   Test Environment (Refer to LM-79-19 Clause 4.2.1 / 4.3 / 4.7)
      1.1  Ambient Temperature：25℃±1.2℃
      1.2  Humidity: 10%-65%
      1.3  Airflow: 0.2m/s

2.   Test Circuit Requirements (Refer to LM-79-19 Clause 5.2.1): Power supply request 4-terminal connection, 2-terminal power supply, 2- terminal feedback

3.   AC Power Supply (Refer to LM-79-19 Clause 5.1.1 and Clause 5.1.2)
      3.1  Load regulation rate: ±0.2%
      3.2  Accuracy requirements: 0.1% (reading) + 0.1% (range)
      3.3  Example: If the power supply of lamp is 220V and the range is 300V, the actual output voltage should be 220V ± 0.26V

LISUN LSP-500VARC Pure Sine Wave AC Power Source fully meet the requirement, click here to learn more about it.

4.   DC Power Supply (Refer to LM-79-19 Clause 5.1.3)
      4.1  Load regulation rate: ±0.2%
      4.2  Accuracy requirements: Current and voltage are both 0.1%

LISUN DC3010 Digital CC and CV DC Power Supply fully meet the requirement, click here to learn more about it.

5.   Power Meters (Refer to LM-79-19 Clause 5.3)
      5.1  Sampling frequency : 1kHz-100kHz
      5.2  The meter shall have an expanded uncertainty (k=2) of 0.6% or less for measurement frequencies ranging from 0.5Hz to 1kHz, and an expanded unvertainty (k=2) of 2.0% or less for measurement frequencies ranging from 1kHz to 100kHz
      5.3  Total Harmonic Distortion Measurement 2~50 times

LISUN LS2050 Digital Power Meter fully meet the requirement. Click here to learn more about it.

6.   Optical and Electrical Waveforms (Refer to LM-79-19 Clause 6.6)     

LSRF-3 Lamp Start, Run-up Time and Flicker Test System

LISUN LSRF-3 Lamp Start, Run-up Time and Flicker Test System fully mee the requirements. The LSRF-3 can work with LISUN LPCE-2 High Precision Spectroradiometer Integrating Sphere System or LISUN LSG-6000CCD Moving Detector Goniospectroradiometer. 

7.   Photometric Detector (Refer to LM-79-19 Clause 7.3.2)
      6.1  Cosine angular responsivity f2(ε,φ) less than 2%
      6.2  f1’ less than 3%   

8.   Spectroradiometer (Refer to LM-79-19 Clause 7.3.2)
      7.1  380-780nm
      7.2  Bandwidth not greater than 5nm
      7.3  Wevelength unvertainty within 0.5nm
      7.4  Sensitivity: Refer to LM-78-17

LISUN LPCE-2 High Precision Spectroradiometer Integrating Sphere System fully meet the requierment, click here to learn more about it.

LPCE-2 High Precision Spectroradiometer Integrating Sphere System

9.   Goniometer variable angle tester (Refer to LM-79-19 Clause 7.3.3)
      8.1  For lamps with beam angle < 20°: 100%-50% maximum luminous intensity choose no more than 1 degree angular resolution; 50%-10% maximum luminous intensity choose no more than 2 degrees angular resolution; 10%-0% maximum luminous intensity choose no more than 5 degrees angular resolution;
      8.2  For lamps with beam angle ≥20°: 100%-50% maximum luminous intensity choose no more than 2 degrees angular resolution; 50%-0% maximum luminous intensity choose no more than 5 degrees angular resolution。

LISUN LSG-6000CCD Moving Detector Goniospectroradiometer fully meet the requierment, click here to learn more about it.

LSG-6000CCD Moving Detector Goniospectroradiometer

10.   Stabilization Requirement (Refer to LM-79-19 Clause 6.4)
      9.1  Monitor for at least 30 minutes
      9.2  Take at least three readings of the light output and electrical power consumption taken over period of 20 minutes
      9.3  Stability shall be achieved when the variation (maximum to minimum) divided by the last measurements is less than 0.5%

11.   Test Report (Refer to LM-79-19 Clause 11.1)
      10.1  Test date and testing organization
      10.2  Manufacture’s name
      10.3  Optical parameters measured (e.g., total luminous flux, radiant flux, photon flux)
      10.4  Measured electrical values (Clarify AC, including frequency, or DC)
      10.5  Calculated quantities (e.g., luminous efficacy, angular color uniformity)
      10.6  Ambient temperature
      10.7  Measurement conditions. For sphere measurement: Sphere diameter, coating reflectance, 4π or 2π geometry. For goniophotometer measurement: Photometric distance
      10.8  SI (source of traceability)
      10.9  Self-absorption correction factor
      10.10 Luminous intensity
      10.11  Chromaticity coordinates, CCT, CRI
      10.12  ANSI/IES TM-30-18 (Rg Rf,Local Chroma Shift, Local Hue Shift)
      10.13  Spectral power distribution

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Surge Generator, EMC Test Systems, ESD Simulator, EMI Test Receiver, Electrical Safety Tester, Integrating Sphere, Temperature Chamber, Salt Spray Test, Environmental Test Chamber, LED Test Instruments, CFL Test Instruments, Spectroradiometer, Waterproof Test Equipment, Plug and Switch Testing, AC and DC Power Supply.

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