LM-79 Testing, Lm 79 Test report, LM 79 Test procedure, India
ITC India is a NABL accredited laboratory in discipline of Electrical (T-1811), Electronics (T-3509) and photometry (T-3510), serving its satisfied customers for last 5 years. Laboratory is fully equipped with the highly accurate Machines to test LM 79. It owns a Integrating sphere as well as the Goniophotometer. Qualified and experienced engineer are appointed to perform the desired tests.
Gone are those days when we use incandescence (tungsten filament) or fluorescent (mercury atoms) bulb. They are replaced by LED’s Now; this is an era of SSL (LED) as ……There is innumerable reason for the rise in LED’s which cannot be counted on finger tips. It is beneficial to both USERS as well as to the nation. Its superior features make it so promising that one cannot deny using LED’s. The features of LED’s are, its low power consumption, digitally controllable, Low maintenance, Ultra long source life, no UV or IR radiations, No mercury content. SSL uses semiconductors material to convert Electricity into light. LED’s are non carbon materials.
Efficacy is the quality parameter for LED: it is measure in Lumen per watt. Higher efficacy means high energy efficient. Another quality factor is lifetime and last but not the least is Color rendering Index (CRI). CRI measures the ability of light source to reproduce the color of various objects in comparison with natural light source.
How LM-79 testing can help assess LED luminaries quality and performance?
AS LM79 report provides you with the Photometric as well as electrical parameters with a spectrum Test report. The photometric parameters are luminous flux, Efficacy and Radiant Power, CIE colorimetric Parameters (coordinates Color rendering Index (CRI), color coordinate Temperature (CCT) Duv Value, and light Intensity Distribution .Current, Voltage, Power factor, Power and frequency are the electrical parameters. It Focus on the efficiency and CRI, which are the quality parameter. Efficiency measures how much electrical energy is converting into light energy. Power factor is another electrical metric for LED driver performance and often a key parameter for street lighting due to the large number of these luminaries connected to the power grid. As far as for lifetime, LM 80 covers that part.
What is the LM-79 test methodology?
LM 79 is approved method to test Photometric and electrical measurements of Solid state lightning. It describes the procedure and precaution to be observed during measurements. This approved method covers LED based SSL products with control electronics and heat sinks incorporated, that is , those devices that require only AC main power or a DC voltage power supply to operate. This document does not covers SSL products that require external operating circuits, or external heat sink. LM 79 covers SSL product in a form of luminaries (fixture incorporating light source) as well as integrated LED lamps.
Why do we need it?
We need it to access the quality and other parameters due to increasing competition in the market. It provides the efficiency and power factor.
How is LM-79 different from other test methods used for conventional lighting products?
This approved method is a guide developed for the measurements of SSL products. While many other standards for photometric measurements of light sources and luminaries are available, these standards are separated for measurements of lamps and luminaries. Since the current SSL products are in the form of luminaries or lamps, and LED light source in luminaries are not easily separated as replaceable lamps, these existing standard cannot be applied directly to SSL products. This necessitates the use of absolute photometry. This test method uses absolute photometry where as other standard uses relative photometry in short.
Now lets us clear about relative and absolute photometry.
S.NO
Absolute Photometry
Relative Photometry
1
Total lumen output of a luminary (bulb with fixture)
Total Lumen output of a bare lamp is measured.
2
Method used to measure LED performance.
Method used to measure Bare bulb and system performance.
3
Output is relative to an easy measured condition.
Output is measured in calibrated units under specific operating and environment conditions, ambient temperature, input voltage and orientation.
4
Specific lamp performance does not matter,
Lamps and system performance matters.
5
Use for SSL products
For NON SSL products
What are the LM-79 test outcomes?
The outcome of the LM 79 is the REPORT providing all the required parameters as per LM 79.
They are ……
CIE colorimetric parameters
Chromaticity coordinate (x)
Chromaticity coordinate (y)
Chromaticity coordinate (u’)
Chromaticity coordinate (v)
Chromaticity coordinate (v’)
Correlated color temperature(Tc)
Duv Value
Color Rendering Index(Ra)
Photometric Parameters
Luminous Flux( Lumen)
Luminous Efficacy( Lm/W)
Radiant Power
Electric Parameters
Input Voltage(V)
Current(A)
Power(W)
Power Factor
Frequency(Hz)
Test information
Ambient Temperature, Stabilization Time, Total Operating Time, Sphere Dia, Photometric method or instrument used Wavelength range in nm of spectroradiometer.
Along with this a SPECTRUM TEST REPORT is also issued.
What are the limitations of LM-79?
Chips, Packages, or Modules requiring external heat sinks or operating circuits are not covered
Does not state the sampling size.
Is there a future scope for improvement in the LM-79 test?
Yes of course, there is always a scope for improvement in all areas.
Range/criteria of acceptance of CCT, CRI & Lumens may be defining to establish a harmonization of parameters globally.
Top Searches related to LM 79 Tests for LED Tube Lights:
ITCIndia NABL Approved Electrical Safety Testing Laboratory, ITCIndia Laboratory is following the procedure as required by International Standard IEC 17025 and is already certified for ISO 17025 by NABL , has been awarded accreditation by the National Accreditation Board for Testing and Calibration Laboratories (NABL). Under the Energy Efficient Lighting Products Program. This includes LM-79 accreditation for Solid State Lighting Luminaires, Total Flux Measurements (Luminous Efficacy) & Solid State Lighting Luminaires, Luminous Intensity Measurements.
Definition of LM-79 Testing:
LM-79 is one approved method that describes procedures & precautions in performing measurement of LED products.
Scope of IES LM-79 testing:
LM-79 Testing is applied to solid-state lighting products that include the following requirements:
LED based products that are integrated control circuit and heat sinks
LED based products only requiring AC or DC power supply
And does not cover as bellow:
LED products requiring external operating circuits or heat sinks (bare LED chips, package and modules)
Fixtures designed for LED products but sold without a light source
Electrical Requirements:
SSL products work with AC power: voltage, electrical current, power, frequency, power factor
SSL products work with DC power: voltage, electrical current, power
Test Condition and Procedures/LM-79 Procedures and Conditions:
Ambient Conditions
Temperature–maintaining at 25℃±1℃ / Maintain temperature at 25 degrees C +/-1 degree C (within 1M)
Integrating Sphere: Integrating sphere systems are used to measure the total luminous flux and color for LM-79. This can be performed with a photometer (total luminous flux) or a spectral radiometer (spectral radiant flux). Utilizing a spectral radiometer and integrating sphere is the preferred method, which derives total luminous flux and color qualities form spectral radiant flux measurements. Click here to see (Video) how to do LM-79 Test with Integrating sphere systems
Flux (to derive total luminous flux and color qualities)
Goniophometer:Goniophotometer systems are also used for LM-79 testing to measure luminous intensity distribution. The Goniophotometer system tests derive total luminous flux and provide color characteristics including CCT and CRI.
For measuring luminous intensity distribution
Total luminous flux is derived
Provides color characteristics with spectral radiometer including CCT, CRI
Testing Data of IES LM-79/LM-79 Test Outputs and Calculations:
ITCIndia specializes in the measurement of Solid State Lighting per IES standards including NABL accredited LM-79 luminaire testing. ITCIndia laboratory is NABL Approved LM-79 Luminaire Testing, LM-79 Luminaire Testing for ENERGY STAR® for SSL, and is accredited to provide test and measurement under ISO 17025.
ITC India NABL approved Testing Laboratory (with Certificate No. T 1811 attached herewith) with specialization to test against EN and IEC standards for electrical safety leading to CE/NIST/IEC certification. Our Lab is fully equipped with high accuracy measuring testing Instruments and trained personal to provide testing & certification services for different type of products according to IEC Standards. Some of which are IEC 60335–1, IEC 60601, IEC 61010, IEC 60204, IEC 60598, IEC 60950, IEC 61427, BS EN 50262, etc…..
The laboratory is following the procedure as required by International Standard IEC/ISO 17025 and is already certified for IEC/ISO 17025 by NABL.ITC INDIA performing ELECTRICAL SAFETY TESTING for the following: EMC/EMI Testing Machinery Testing Luminaries and Lightning Testing Electro Medical Equipments Testing Laboratory Equipment Testing Household Appliances Testing IT and Telecom Equipment Testing Environmental Testing Battery Testing. LM 79
ITCIndia’s LM-79 luminaire and lamp testing fully evaluates the assembled luminaire for total flux, electrical power, efficacy (lm/watt), chromaticity, and angular distribution of light.
ITCIndia provides LM-79 luminaire and lamp testing reports for:
ITCIndia testing facilities are equipped with multiple type-c moving mirror color goniophotometers and integrating spheres up to 3 meters in diameter – ideal for testing large troffers and LED street lights.
ITCIndia laboratory features both a Type A and Type C Goniometer for testing a wide variety of luminaires.
LM-79-08. It is the Illuminating Engineering Society of North America (IESNA) approved method for the Electrical and Photometric Measurements of Solid-State Lighting. It measures an LED luminaire or integral lamp as a whole system according to a standard process using specified equipment.
IES LM-79 Electrical and Photometric Measurements of Solid-State Lighting Products
Approved method describing procedures and precautions in performing reproducible measurements of LED Lights:
Total luminous flux
Electrical powers
Luminous Intensity distribution
Efficacy (lm/watt)
Chromaticity
LM-79 Luminaire Testing Scope:
Applies to LED-based products incorporating control electronics and heat sinks, that is, those devices that require only AC mains power or a DC voltage power supply to operate.
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 cannot be separated from their luminaire because of heat effects (Absolute)
Relative vs. Absolute Photometry:
Relative testing – Lamps of interest and luminaire (with reference lamp) are measured separately. Then the actual light distribution and intensity of the complete luminaire of interest is derived by normalization of the test data
Absolute testing – The actual light distribution and intensity of the luminaire of interest is measured directly from the complete luminaire.
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