Understanding LED tests IES LM-79
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]
Get Instant Quotations, Fill the Enquiry form:
LM 79 Test Laboratory for LED Street Light
LM-79 Testing for LED Street Lights
ITC India NABL Accredited Electrical Safety Testing Laboratory provide LM-79 Testing for LED Street Light (45W & 60W) includes accreditation for Solid State Lighting Luminaires, Total Flux Measurements (Luminous Efficacy) & Solid State Lighting Luminaires, Luminous Intensity Measurements.
The Testing to be conducted is as follows(Testing as per standard):-
Test to be conducted under LM 79:
- Measurement of Total Luminous Flux & Luminous Efficacy
- Color Characteristics (Chromaticity Coordinates, Correlated Color Temperature & Color Rendering Index)
- Light Intensity Distribution Test
IES LM-79-08 Testing Parameters, LM-79 Testing Approved Method: Electrical and photometric Measurements of Solid-state Lighting Product
LM-79 Test Photometric Results:
Colorimetric Parameters:
- 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:
- Total Luminous Flux (Lumens)
- Luminous Efficacy (Lumens/Watt)
- Radiant Power (Watts)
Electrical Results:
- Input Power (Watts)
- Input Voltage (Volts )
- Input Current (Amps)
- Power Factor
- Input Frequency (Hz)
Additional Parameters:
- Stabilization Time (Light and Power) = 60 minutes
- Test Geometry Configuration = 4π
- Spectroradiometer = (Lisun LMS-9000A Plus)
- Ambient Temperature = 25.0°C
Click Here to See Video How to Do LM-79 Testing ?
