Performance measurement of lamps and luminaires
What is LM 79 Test methodology?
What is LM 79 Test methodology?
LM 79 is an approved method that describes the procedure to be followed and precautions to be observed in performing reproducible measurements of total Luminous flux, electrical power, luminous intensity distribution, chromaticity of Solid-State lighting products for illumination purposes under standard conditions.
LM 79 covers- LED based SSL products with control electronics and heat sinks. Luminaries (fixtures incorporating light source) as well integrated LED lamps.
LM 79 doesn’t cover– fixtures without a light source, SSL products that require external operating.
LM 79
Test method for total luminous flux Measurements:
The total luminous flux of SSL product shall be measured with an Integrating Sphere or Goniophotometer. The method may be chosen depending upon what other measurements quantities (color, intensity distribution) need to be measured., the size of SSL products, and other requirements.
The integrating sphere is suited for total luminous flux and color measurements of integrated LED lamps and relative small size LED luminaries. Advantage of using integrating sphere is that it does not requires the “ Dark Room”., and also it is less time consuming.
The Goniophotometer provides measurements of Luminous Intensity Distribution as well as total luminous flux. It can take measurements of larger size luminaries as well as small size luminaries. It has to be installed in Dark Room. Measurements in goniophotometer are time consuming.
| Integrating Sphere | Goniophotometer | |
| Conditions | No Dark room | Dark Room |
| Size of SSL | Small Size luminaries | Large size as well as small size Luminaries |
| Measurements | Total Luminous Flux | Light Intensity Distribution , Total Luminous Flux |
| Duration of Test | Fast Measurements | Time consuming as compared to Sphere photometer. |
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How LM-79 testing can help assess LED luminary quality and performance?
How LM-79 testing can help assess LED luminary quality and performance?
We all believe in buying quality products. Discovery of LED is boon to our world. LED has replaced all the traditional lightning systems because of its quality, life and performance. Manufacturers are switching from manufacturing traditional lightning to produce LED lighting. Many of the manufacturers are making unsubstantial claims regarding colour quality, luminous flux (lm), efficacy (lm/w) and general quality. This can Lead to LED degradation. To ensure quality, a series of test has to be performed on LED luminaries for its long term survival. This is served by LM 79 test method. It is not only the LED but the whole SSL has to qualify all the tests.
For special purpose, it may be useful to determine the characteristics of SSL products when they are operated at other than standard conditions described in the approved method.
Photometric testing includes measurements of total radiant flux, luminous flux, Efficacy (lm/w), chromaticity, correlated color temperature (CCT), and color rendering index (CRI), Light Intensity Distribution (cd). Radiant flux, expressed in watts, is a measurement of the total power of electromagnetic radiation (light) emitted from the luminary or lamp. Luminous flux is a weighted measurement based on human visual perception.
The above measured parameters help to access the LED luminary quality and performance.
ITC india Pvt Ltd is a leading company to test LM 79, company has both the highly accurate equipments “The Integrating Sphere” & “ The Goniophotometer” installed at its premises.
ITC india is a NABL accredited lab having full scope of LM 79( certificate no. T-3510.)
