lm79 and lm80 standards
Thermal Testing for LED Lights
Thermal Testing for LED Lights, Thermal Testing of LEDs, Thermal testing of road luminaires
If you are looking for Thermal Testing Laboratory for LED Lighting In your Area, ITCIndia NABL Approved Electrical Safety testing Laboratory In India. ITC India one of the best Thermal 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.
Thermal test is one of the important tests while testing LED luminaries, so we would like to have its basic knowledge.
Thermal test is performed for normal and abnormal conditions. We will peep inside both the conditions respectively.
The motive of thermal test is that the Lamp, part of the luminary, supply wiring, mounting surface should not attain the temperature which can cause injury. The parts like handles should not be too hot to be touched. Same scenario is for the track mounted luminaries are there. Track mounted Luminaries are tested as per clause 12.4.1. Draught proof chamber is specially designed for this particular test. While performing the test, the through wiring and the looping in wiring shall be loaded to the maximum value allowed by the size of the wire, or at a value prescribed by the manufacturer in the installation instructions.
After the test, none of the temperature shall exceed the values given in table 12.1 & 12.2 of IEC 60598-1.
While performing the thermal test in abnormal condition, luminaries are tested in abnormal conditions. The temperature shall not exceed as mentioned in table 12.3, 12.4, and 12.5. If the luminary possesses motor, the test is performed in most critical condition.
Clause 12.6 is applied to the luminary classified for mounting on normally flammable surfaces with a control gear. Clause 12.7 is thermal test in regard to fault conditions in lamp control gear or electronics devices incorporated in thermoplastics luminaries.
Temperature Measurement Data as per client specification
The sample was operated until constant temperatures were obtained. A temperature was considered
constant if the sample was operating for at least three hours and upon three successive readings – taken at
15 minute intervals – were within one degree and were not rising.
Thermocouples were attached at locations described in the results by means of cement made of water
Table-1
| No. of LED’s: | 48 | Ambient Temperature: | 25°C ± 1°C | ||
| Total no. of test points: | 55 | No. of Rows | 4 | ||
| Sr. no. | Measured Temperature at Pt. | Measured Temperature | |||
| Row-1 | |||||
| 1 | LED 1 (Ts) | 56.3 | |||
| 2 | LED 2 (Ts) | 56.7 | |||
| 3 | LED 3 (Ts) | 55.8 | |||
| 4 | LED 4 (Ts) | 55.1 | |||
| 5 | LED 5 (Ts) | 56.4 | |||
| 6 | LED 6 (Ts) | 55.9 | |||
| 7 | LED 7 (Ts) | 55.2 | |||
| 8 | LED 8 (Ts) | 57.1 | |||
| 9 | LED 9 (Ts) | 57.4 | |||
| 10 | LED 10 (Ts) | 56.6 | |||
| 11 | LED 11 (Ts) | 56.9 | |||
| 12 | LED 12 (Ts) | 57.2 | |||
| Row- 2 | |||||
| 13 | LED 13 (Ts) | 54.6 | |||
| 14 | LED 14 (Ts) | 55.8 | |||
| 15 | LED 15 (Ts) | 57.6 | |||
| 16 | LED 16 (Ts) | 57.9 | |||
| 17 | LED 17 (Ts) | 55.5 | |||
| 18 | LED 18 (Ts) | 57.4 | |||
| 19 | LED 19 (Ts) | 56.9 | |||
| 20 | LED 20 (Ts) | 57.6 | |||
| 21 | LED 21 (Ts) | 56.5 | |||
| 22 | LED 22 (Ts) | 57.5 | |||
| 23 | LED 23 (Ts) | 56.3 | |||
| 24 | LED 24 (Ts) | 56.9 | |||
| Row -3 | |||||
| 25 | LED 25 (Ts) | 55.5 | |||
| 26 | LED 26 (Ts) | 54.9 | |||
| 27 | LED 27 (Ts) | 55.9 | |||
| 28 | LED 28 (Ts) | 56.0 | |||
| 29 | LED 29 (Ts) | 56.3 | |||
| 30 | LED 30 (Ts) | 55.9 | |||
| 31 | LED 31 (Ts) | 56.2 | |||
| 32 | LED 32 (Ts) | 54.3 | |||
| 33 | LED 33 (Ts) | 55.2 | |||
| 34 | LED 34 (Ts) | 55.9 | |||
| 35 | LED 35 (Ts) | 56.3 | |||
| 36 | LED 36 (Ts) | 56.8 | |||
| Row- 4 | |||||
| 37 | LED 37 (Ts) | 55.5 | |||
| 38 | LED 38 (Ts) | 55.9 | |||
| 39 | LED 39 (Ts) | 56.1 | |||
| 40 | LED 40 (Ts) | 57.5 | |||
| 41 | LED 41 (Ts) | 56.2 | |||
| 42 | LED 42 (Ts) | 55.9 | |||
| 43 | LED 43 (Ts) | 57.2 | |||
| 44 | LED 44 (Ts) | 57.7 | |||
| 45 | LED 45 (Ts) | 57.3 | |||
| 46 | LED 46 (Ts) | 56.9 | |||
| 47 | LED 47 (Ts) | 57.5 | |||
| 48 | LED 48 (Ts) | 57.8 | |||
| TP Point Pcb -1 | |||||
| 1. | TP | 56.5 | |||
| TP Point Pcb -2 | |||||
| 1. | TP | 55.6 | |||
| TP Point Pcb -3 | |||||
| 1. | TP | 55.9 | |||
| TP Point Pcb -4 | |||||
| 1. | TP | 56.1 | |||
| TP Point Pcb -5 | |||||
| 1. | TP | 56.2 | |||
| TP Point Pcb -6 | |||||
| 1. | TP | 56.9 | |||
| Ballast Tc Test point | |||||
| 1. | Tc | 53.4 | |||
ITC India Pvt. Ltd. is accompanying which possesses the full scope of IEC 60598-1. For any query please write us at …..
If you’re Buyers Demanding for Thermal Testing– Contact Now
Wish this blog post will be help. If you have any other questions, please feel free to contact us. ITCIndia team looking forward work with you and get better together!
Mr. Puneet Sharma | Call: 08196980555 | E-mail: [email protected]
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What are the limitations of LM-79?
What are the limitations of LM-79?
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.
If you’re Buyers Demanding for LM-79 Testing– Contact Now!
Wish this blog post will be help. If you have any other questions, please feel free to contact us. ITCIndia team looking forward work with you and get better together!
Mr. Puneet Sharma | Call: 08196980555 | E-mail: [email protected]
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What are LM 79 Test Outcomes?
What are LM 79 Test Outcomes?
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.
Integrating Sphere Goniophotometer
The test report shall list all significant data for each SSL product tested together with performance data. The outcomes of the LM-79 test are:
- Correction factor applied ( e.g. spectral mismatch, self absorption , intensity distribution etc.)
- Measured total luminous flux( lumen(lm)), input voltage(v), current(a), power(w), Luminous intensity distribution(cd), efficacy(lm/w)
- 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
If you’re Buyers Demanding for LM-79 Testing– Contact Now!
Wish this blog post will be help. If you have any other questions, please feel free to contact us. ITCIndia team looking forward work with you and get better together!
Mr. Puneet Sharma | Call: 08196980555 | E-mail: [email protected]
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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.)
