LM-79 Testing
LM-79 Testing is an essential performance evaluation process for LED lighting products. It measures the electrical and photometric characteristics of complete LED lighting products rather than individual LED chips or components. The test is conducted according to the IES LM-79 standard, officially known as Approved Method: Optical and Electrical Measurements of Solid-State Lighting Products. Manufacturers, importers, and suppliers use LM-79 Testing to verify the quality, efficiency, and safety of LED luminaires before introducing them to the market.
As energy-efficient lighting solutions continue to replace traditional lighting technologies, regulatory authorities and customers increasingly demand accurate performance data. LM-79 Testing provides reliable information about a product's light output, power consumption, efficacy, color characteristics, and other critical performance parameters. This testing is often required for product certifications, government tenders, energy efficiency programs, and international market access.
What is LM-79 Testing?
LM-79 Testing is a standardized laboratory test developed by the Illuminating Engineering Society (IES). Unlike tests performed on LED components, LM-79 evaluates the performance of the complete lighting fixture, including the LED module, driver, optics, and housing. This ensures that the reported performance accurately reflects how the product operates in real-world conditions.
The test is conducted in accredited laboratories using specialized equipment such as integrating spheres, goniophotometers, spectroradiometers, and precision power analyzers. These instruments provide highly accurate measurements of a lighting product's optical and electrical performance.
Parameters Measured in LM-79 Testing
LM-79 Testing evaluates several important characteristics of LED lighting products, including:
Total luminous flux (lumens)
Luminous efficacy (lumens per watt)
Electrical power consumption
Input voltage and current
Power factor
Correlated Color Temperature (CCT)
Color Rendering Index (CRI)
Chromaticity coordinates
Spectral power distribution
Beam angle and light distribution
Luminous intensity distribution
These measurements help manufacturers demonstrate product performance and compliance with customer specifications and regulatory requirements.
Products Covered Under LM-79 Testing
LM-79 Testing is applicable to a wide range of LED lighting products, including:
LED bulbs
LED tube lights
LED panel lights
LED street lights
LED flood lights
LED high bay lights
LED downlights
LED ceiling lights
LED industrial luminaires
LED outdoor lighting fixtures
Decorative LED lighting
Architectural lighting systems
Since the test evaluates the complete luminaire, each product model must generally undergo separate testing.
Importance of LM-79 Testing
LM-79 Testing offers numerous benefits to manufacturers, importers, and consumers. Some of the major advantages include:
Accurate Performance Verification
The test provides verified measurements of light output, efficiency, and electrical characteristics under standardized laboratory conditions.
Product Quality Assurance
Manufacturers can identify performance issues during product development and improve product quality before commercialization.
Certification Support
LM-79 reports are commonly required for various certification schemes, energy efficiency programs, and regulatory approvals.
Customer Confidence
Verified laboratory reports increase customer trust by providing transparent and reliable product performance data.
Market Acceptance
Many domestic and international buyers prefer or require independently tested LED lighting products before procurement.
LM-79 Testing Procedure
The LM-79 Testing process generally involves the following steps:
Product Submission
The manufacturer or importer submits production-ready LED lighting samples along with product specifications.
Sample Inspection
The laboratory verifies the sample details and prepares the product for testing.
Electrical Measurements
Input voltage, current, power consumption, and power factor are measured using calibrated equipment.
Photometric Measurements
The product is tested using an integrating sphere or goniophotometer to determine luminous flux, efficacy, beam distribution, and other optical parameters.
Color Measurements
The laboratory measures CCT, CRI, chromaticity coordinates, and spectral characteristics.
Test Report Preparation
After successful testing, a comprehensive LM-79 Test Report is prepared containing all measured parameters and test conditions.
Documents Required for LM-79 Testing
Although document requirements may vary between laboratories, the following are generally required:
Product datasheet
Product specifications
Technical drawings
LED driver details
Product photographs
User manual (if available)
Product model information
Manufacturer details
Sample quantity as specified by the laboratory
Why Choose an Accredited Laboratory?
Selecting an accredited testing laboratory ensures reliable and internationally accepted results. Accredited laboratories maintain calibrated equipment, qualified technical personnel, controlled environmental conditions, and standardized testing procedures. Reports issued by accredited laboratories are widely accepted by certification bodies, government agencies, and international customers.
Difference Between LM-79 and LM-80 Testing
LM-79 and LM-80 are often confused, but they serve different purposes.
LM-79 Testing evaluates the performance of the complete LED lighting product.
LM-80 Testing evaluates the lumen maintenance and long-term performance of individual LED packages, arrays, or modules.
Both tests are important but address different aspects of LED product performance.
Applications of LM-79 Test Reports
LM-79 reports are commonly used for:
BIS certification support
Government procurement projects
Energy efficiency labeling
Product performance verification
International exports
Technical documentation
Product marketing
Quality assurance programs
Customer compliance requirements
Conclusion
LM-79 Testing is one of the most important performance evaluation standards for LED lighting products. It provides independent verification of electrical and photometric performance, enabling manufacturers to demonstrate product quality, efficiency, and reliability. Whether you manufacture LED bulbs, street lights, panel lights, flood lights, or industrial luminaires, obtaining an LM-79 Test Report enhances product credibility and supports regulatory compliance.
Partnering with an experienced compliance consultant and an accredited testing laboratory can simplify the LM-79 Testing process, reduce approval timelines, and ensure that your LED products meet national and international quality standards. Investing in LM-79 Testing not only strengthens your market reputation but also helps customers make informed purchasing decisions based on verified performance data.
