As we all know about the strength of LM 79. Everything has its pros and cons. Let us have a look on the drawbacks of LM 79.
LM 79 depicts the parameters of the individual products. So the obtained Parameters cannot be used to access alike products.
Other limitation is the sample size. It does not state any sample size. So, the manufacturer provides only one sample instead of supplying more. This thus increases the vulnerability of lesser quality products.
This can be used only to determine complete luminary instead of LED used ( as based on absolute photometry) , which can produce different results due to quality of accessories used like glass, thermal effect, lenses etc.
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Total Lumen output of a bare lamp is measured in relative photometry for more clarity; the total luminous flux of the lamp is measured separately without the Fixture. In IES LM-80- 08, IES LM 82-12, the relative photometry is used. The purpose is to find light output, Efficacy, color over temperature for light engines.
Relative photometry can measures:
Total luminous flux of the bare lamp
Luminous intensity distribution
Scale the luminous intensity values by the ratio of the measured lamp lumens to the rated lamp lumens.
Some important features regarding relative photometry:
Relative photometry is performed for luminaries with conventional sources.
Luminaries test is referenced to the luminous Flux measured for bare lamp.
The result produced is in the units of candela per rated lumens( cd/rated lm)
It can also measure the efficiency of luminary.
Normalize ballast factor, Lamp age.
Specific lamp performance doesn’t matter
Relative photometry is not used in SSL with integrated lamps due to many reasons:
The LED‘s are difficult to remove from the Luminaries.
A large number of LED devices will not work properly without heat sinks provided with luminaries.
The thermal environment that the LED devices undergo within the luminary is often radically different from the thermal environment it will practice in its “bare lamp” configuration.
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If you are looking for IK Testing Laboratory for LED Lighting In your Area, ITCIndia Electrical Safety testing Laboratory Approved from NABL. ITC India one of the best IK Impact Testing Laboratory in India, Mumbai, Chennai, Ahmedabad, New Delhi, Pune, Kolkata, Bangalore, Hyderabad, Surat, Visakhapatnam.
ITCIndia “Institute of Testing and Certification India Pvt. Ltd” are a leading testing lab having a NABL accreditation under ELECTRICAL, ELECTRONICS and PHOTOMETRY testing with certificate no. T-3509, T-3570 and T-1811. ITCIndia Lab is following the procedure as required by International Standard IEC 17025 and is already certified for ISO/IEC 17025.
ITCIndia offers full IK Impact and IP Testing and certification services for LED Lighting luminaires to IEC 60598-2-3 Impact IK ratings are defined as IKXX, where “XX” is a number from 00 to 10 indicating the degrees of protection provided by electrical enclosures including luminaires against external mechanical impacts. The Impact IK rating scale identifies the ability of an enclosure to resist impact energy levels measured in joules. IEC 62262 specifies how the enclosure must be mounted for IK Impact and IP Testing, the atmospheric conditions required, the quantity and distribution of the test impacts and the impact hammer to be used for each level of Impact IK rating.
Standards for IK Impact and IP Testing for LED Lighting
IEC 62262 specifies the way enclosures should be tested for IK ratings which are defined as the level of protection the enclosures provided against external mechanical impacts. IEC 60598-1 (IEC 60529) specifies the test method used to classify and rate the degree of protection an enclosure provides against intrusion of various sized solid objects from fingers and hands to fine dust and the protection against water intrusion from falling drops to a high pressure water jet.IEC 60598-2-3 is the International Standard for Luminaires for Road and Street Lighting
Degrees of protection against external mechanical impacts
IK00
IK02
IK03
IK05
IK06
IK07
IK08
IK09
IK10
Non-protected
0.2J
0.35J
0.5J
0.7J
1J
2J |5J
10J
20J
IP ratings are defined as IPXX where the first X indicates the degree of protection against solid objects and the second X indicates the degrees of protection against water. A luminaire or lighting component with a rating of IP66 is dust-tight and protected against powerful water jets as described in IEC 60598-1 (IEC 60529).
Degrees of protection against solid objects
IP0X
Non-protected
IP1X
50mm diameter and greater
IP2X
12.55mm diameter and greater
IP3X
2.5mm diameter and greater
IP4X
1.0mm diameter and greater
IP5X
Dust-protected
IP6X
Dust-tight
Degrees of protection against water
IPX0
Non-protected
IPX1
Vertically falling water drops
IPX2
Vertically falling water drops with enclosure tilted
IPX3
Spraying water
IPX4
Splashing water
IPX5
Water jets
IPX6
Powerful water jets
IPX7
Temporary immersion
IPX8
Continuous immersion
IK Impact and IP Testing for LED Lighting Products Ratings that demonstrate the degree of Impact Protection IK Impact and Ingress Protection are critical for LED Lights and other LED lighting products. IP ratings are required per IEC/EN 60598-2-3 for all roadway and street applications. Impact IK ratings are required in specific applications when high impact glass provides protection for the enclosed lamp
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LM-79 is approved test method for electrical and photometric measurements of Solid State Lighting Products. It describes the procedure in measuring total luminous flux, electrical power, luminous intensity distribution, chromaticity under standard conditions. It covers LED based SSL products with control electronics and heat sink incorporated with AC or DC power supply. This does not include LED chips, LED package or LED module but luminaries (fixtures incorporating light source) as well as integrated LED lamps.
The equipment used in LM-79 is integrated sphere and goniophotometer.
Color quantities( chromaticity coordinates, CCT, CRI )
Spectral power distribution
Bandwidth of spectoradiometer, if spectral distribution and/or color quantities are reported.
Statement of uncertainties (if required)
Deviation from standard operating procedures, if any.
Here is the link of a test report issued by our prestigious company. LM 79 Test Outcomes
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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.
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?
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.
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LM 79 testing by NABL - Accredited lab in just 5 days
If you are looking for LM-79 Testing for LED lights, ITC India One of the Best NABL Accredited Laboratory provide LM-79 Testing for LED Lights includes accreditation for SSL Solid State Lighting Luminaires, Total Flux Measurements (Luminous Efficacy) & Solid State Lighting Luminaires, Luminous Intensity Measurements.
ITCIndia “Institute of Testing and Certification India Pvt. Ltd” are a leading testing lab having a NABL accreditation under ELECTRICAL, ELECTRONICS and PHOTOMETRY testing with certificate no. T-3509, T-3570 and T-1811. ITCIndia Lab is following the procedure as required by International Standard IEC 17025 and is already certified for ISO/IEC 17025.
What is LM-79 Testing?
It is the IESNA certified method for the Electrical and Photometric Measurements of SSL Solid State Lighting. It measures an LED luminaire or integral lamp as a whole system according to a standard process using specified products.
It is the Test of the LED Lighting source case temperature within the LED system (LED Street light, LED Bulb, LED Down Light, LED Flood Light, LED High Bay Light). Put simply, it is the temperature of the LED Lights within the luminaire. The measurement has to be performed as per to the temperature measurement point out by the LED package manufacturer.
Why do we need LM -79 Testing?
Due to the collection of LED lighting products available in the Industries, there is a need to assess the quality and many parameters Related with LED lighting products. LM-79 data allows objective product comparisons and allows for evaluation relative to performance and Quality requirements.
Who can perform LM-79 testing?
LM-79 testing should be performed by ITC INDIA Laboratory for the category of product tested. Only reports from recognized laboratories are relevant. This standard is used for ENERGY STAR program qualification and lighting facts advocate program. All LED product testing are performed according to LM-79 in ITC INDIA laboratory and reports are available upon request. Click hear to see our LM -79 testing report.
What does ITC INDIA provide?
The testing report issued according to a standard format will provide
Total Luminous Flux
LID (Luminous Intensity Distribution)
Electrical Parameter (Voltage AC, DC, Wattage, Current, Power Factor)
Luminous Efficacy (calculated)
Color Characteristics (CRI, CCT…)
Chromaticity coordinates (X, Y...)
Once ISTMT is known, we check if the temperature within the luminaire is within the temperature of the LM-80-08 LED source report.
Colorimetric Parameters for LED lights:
·Chromaticity coordinates: (Chroma x / Chroma y / Chroma u(u’) / Chroma v / Chroma v’)
· Correlated Color Temperature (CCT)
· Duv Value
· Color Ratio
· Peak Wavelength (nm)
· Half Bandwidth (nm)
· Dominant Wavelength (nm)
· Color Purity
· Color Rendering Index (CRI – Ra)
Photometric Parameters for LED lights:
· Total Luminous Flux (Lumens)
· Luminous Efficacy (Lumens/Watt)
· Radiant Power (Watts)
Electrical Results for LED lights:
· Input Power (Watts)
· Input Voltage (Volts )
· Input Current (Amps)
· Power Factor
· Input Frequency (Hz)
Additional Parameters for LED lights:
· Stabilization Time (Light and Power) = 60 minutes
· Test Geometry Configuration = 4π
· Spectroradiometer = (Lisun LMS-9000A Plus)
· Ambient Temperature = 25.0°C
How to do LM-79 Testing with Integrating Sphere?
How to do LM-79 Testing with Goniophotometer?
Goniophotometer Vs Integrating Sphere
For your better understanding, we are going to show you the LM-79 Test report of latest LED in the following:
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Q:- Is the lumen maintenance percentage a lifetime metric?
No. The possible percentage filed on the LED Lighting Facts label explain the lumen maintenance the quantity of light remaining after a particularized time, distinguished to the basic output of the LED light point of supply while performing in the thermal environment of the lamp or luminaire. SSL Solid-State Lighting lifetime and accuracy , by contrast, take into account the performance of additional system factors over time, containing electronics for example. The power supply or driver, for example. Lenses and reflectors, thermal management system, housing, & accompanying components.
There is no Market standard procedure for calculating or judging the lifetime and/or accuracy of SSL Solid-State Lighting products, taking the whole system into account, though some manufacturers have their own procedures for performance so. LED Lighting Facts uses Company standard testing procedures whenever attainable to make secure apples-to-apples comparisons of product performance.
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