LED Testing Standards Overview
Thermal Testing for LED Lights
Thermal Testing for LED Lights, Thermal Testing of LEDs, Thermal testing of road luminaires
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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!
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What is Relative Photometry?
What is relative photometry?
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.
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 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. |
If you’re Buyers Demanding for Luminaries 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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