Photometric Measurements of LED Products
Performing photometric measurements of LED products in a lab involves a systematic approach to accurately assess their light output and characteristics.
Scopes & Testing
Photometric Measurements of LED Products
Here's a step-by-step guide to conducting these measurements:
1) Setup:
- • Choose a controlled environment with minimal ambient light to avoid interference.
- • Calibrate all measurement equipment, including spectroradiometers, integrating spheres, goniophotometers, and any necessary accessories.
2) Equipment Preparation:
- • Set up the measurement equipment according to manufacturer guidelines and standards (e.g., IESNA LM-79).
- • Ensure the stability of the equipment, such as temperature stabilization for accurate measurements.
3) Sample Preparation:
- • Place the LED product in the measurement setup, ensuring it's securely positioned and aligned properly.
- • If applicable, allow the LED product to reach its operating temperature before starting measurements.
4) Luminous Flux and Luminous Intensity Measurements:
- • Measure the luminous flux (total light output) using an integrating sphere.
- • For luminous intensity, use a goniophotometer to measure the light distribution pattern and intensity in different directions.
5) Color Measurements:
- • Use a spectroradiometer to measure the spectral power distribution of the LED light.
- • Calculate color metrics such as color temperature (CCT), color rendering index (CRI), and chromaticity coordinates (x, y or u', v') from the spectral data.
6) Illuminance Measurements:
- • Position a calibrated illuminance meter at a specific distance from the LED product.
- • Record the illuminance value in lux at various points to assess uniformity.
7) Flicker Measurements:
- • Use a flicker meter or oscilloscope to measure flicker parameters like flicker percentage, flicker index, and modulation depth.
- • Record measurements under different operating conditions and dimming levels, if applicable.
8) Efficiency and Efficacy Measurements:
- • Measure the input power using a power meter and calculate efficiency (output power / input power).
- • Calculate efficacy by dividing the luminous flux by the input power (lm/W).
9) Lifetime and Lumen Maintenance:
- • If available, use LM-80 data or perform accelerated aging tests to estimate lumen maintenance over time.
10) Glare Measurements:
- • Use a glare measurement device to quantify glare discomfort, if applicable.
11) Data Collection and Analysis:
- • Record all measurement data in a structured manner, including product information, test conditions, and results.
- • Analyze the data to ensure it meets industry standards and product specifications.
12) Reporting:
- • Generate a comprehensive test report detailing all measurements and results.
- • Include relevant specifications, compliance with standards, and any observations or recommendations.
13) Quality Assurance:
- • Regularly calibrate measurement equipment to maintain accuracy.
- • Perform repeat measurements and compare results to ensure consistency.
House of Testing Lab follow the industry standards such as IESNA LM-79 and any specific guidelines provided by the LED manufacturer. House of Testing provides valuable information for product performance evaluation, quality assurance, and compliance with lighting standards. We also ensure that these lights meet quality standards and offer safe and reliable power solutions for everyday devices.
Contact us today and experience the superior quality and expertise offered by House of Testing. Trust us to be your trusted partner in ensuring the reliability and performance of your products through comprehensive testing.
PRODUCTS
- • Photometric Measurements of LED Products
STANDARDS
- • IS:16106
TESTS
- • Luminous Efficiency
- • Color Rendering Index (CRI)
- • Color Temperature
- • Color Consistency
- • Color and Stroboscopic Effects
- • Heat Dissipation
- • Lifetime and Reliability
- • Lumen Maintenance
- • Ingress Protection (IP) Rating
- • Dimming Performance
- • Electromagnetic Interference (EMI)
- • Optical Distribution
- • Start-up and Warm-up Time
- • Power Factor and Total Harmonic Distortion (THD)
- • Mechanical Durability
