Photometric Measurement of LED Luminaires
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.
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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. |
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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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Photometric Testing for LED Lighting
Photometric Testing for LED Lighting Laboratory
If you are looking for Photometric Testing Laboratory for LED Lighting In India, Mumbai, Chennai, Ahmedabad, New Delhi, Pune, Kolkata, Bengaluru, Hyderabad, Surat, Visakhapatnam and other city, ITC India Can Help You! ITC India one of the best Photometric Testing Laboratory in India.
We, “Institute of Testing and Certification India Pvt. Ltd” are a leading testing company/laboratory having a NABL accreditation under ELECTRICAL , ELECTRONICS & PHOTOMETRY testing with certificate no. T-3509, T-3570 & T-1811. Testing Laboratory is fully equipped with high accuracy Measuring Instruments & trained personal to provide testing and certification Services for Electrical and Electronic equipment’s. The Laboratory is following the procedure as required by International Standard IEC 17025 and is already certified for ISO/IEC 17025.
Our lab is totally equipped with following high accuracy testing instruments to provide testing solution for LED Lights as per IES LM 79-08 standards/IS 10322/IS 16102 part 2
- High precision CCD Spectroradiometer with 2.0 MTR integrating sphere
- Type- C Moving Detector Goniophotometer as per IES LM 79-08 standard
- LED power driver tester
What should be the Content of IES LM 79-08 test report: The test report should contain below parameter:
- Total Luminous Flux
- Luminous Intensity Distribution, IES file
- Electrical Power Characteristics( voltage , current , power , PF & Hz)
- Luminous Efficacy (calculated)lm/watt
- Color Characteristics (CRI, CCT…)
Why to choose ITC India:
- Have NABL under photometry attached is the copy
- Very short turnaround time: Max 5 working days(can do in short time also)
- Have local office in Major City
- We are always customer driven
- Lowest testing rate in INDIA
For your better understanding, we are going to show you the Photometric Testing report of latest LED in the following:
Learn more about this Photometric test >
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Kindly let us know if you have any present or a future requirement we would be happy to share our Services, past work details , samples test report format, client Testimonials ,formal quotation, etc.
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Mr. Puneet Sharma | Call: 08196980555 | E-mail: [email protected]
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