Light Emitting Diode (LED)

LED Test & Measurement

Litos Stress-Test Platform for Degradation Analysis of LEDs

Fluxim AG

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Litos is an advanced LED stability lifetime measurement system that offers 16 or 32 parallel stressing channels distributed over 4 chambers. It allows researchers to understand the degradation behavior of organic, perovskite, and quantum-dots-based LEDs under a wide range of stress conditions. ...

Specifications
Stress Channels:	16 Channels, 32 Channels
Number Of Chambers:	4
Maximum Current:	60 mA
Connectivity Options:	USB
Humidity Sensors:	Individual for each chamber

Data Sheet

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LED Test and Measurement: Ensuring Performance, Reliability, and Compliance

As Light Emitting Diodes (LEDs) become increasingly integral to modern lighting solutions, rigorous testing and measurement have become essential to ensure their performance, reliability, and adherence to industry standards. The LED Test and Measurement category encompasses a range of equipment and methodologies designed to evaluate various aspects of LED functionality.

Key Testing Parameters

1. Photometric Measurements
Assessing luminous flux, luminous intensity, and luminous efficacy is crucial for determining the brightness and efficiency of LEDs. Integrating spheres and goniophotometers are commonly used for these measurements.

2. Colorimetric Analysis
Evaluating color characteristics such as Correlated Color Temperature (CCT) and Color Rendering Index (CRI) ensures color consistency and quality. Spectroradiometers are employed to measure the spectral power distribution of LEDs.

3. Electrical Testing
Measuring parameters like forward voltage, current, power consumption, and power factor is essential for electrical performance assessment. Source Measure Units (SMUs) and power analyzers are typical instruments used in this context.

4. Thermal Management
Monitoring junction temperature and thermal resistance helps in understanding heat dissipation and its impact on LED lifespan. Thermal imaging cameras and thermocouples are tools utilized for thermal analysis.

5. Reliability and Lifetime Testing
Long-term tests, such as lumen maintenance (LM-80) and accelerated life testing, predict the operational lifespan and performance degradation over time.

Industry Standards and Compliance

Adherence to standardized testing methods ensures consistency and reliability across the industry. Key standards include:

IES LM-79: Electrical and photometric measurements of solid-state lighting products.
IES LM-80: Measuring lumen maintenance of LED light sources.
IES TM-21: Projecting long-term lumen maintenance from LM-80 data.
IEC 61000 Series: Electromagnetic compatibility (EMC) standards for LED equipment.

Compliance with these standards is critical for product certification and market acceptance.

Applications Across Industries

LED test and measurement are vital in various sectors:

Consumer Electronics: Ensuring display and indicator LEDs meet performance criteria.
Automotive: Validating headlamps, tail lights, and interior lighting for safety and durability.
Aerospace and Defense: Testing for reliability under extreme conditions.
Medical Devices: Ensuring precise illumination in diagnostic and surgical equipment.

Did You know?

LED testing isn't just about verifying brightness—it's a multifaceted process that evaluates electrical, optical, thermal, and colorimetric properties to ensure optimal performance and longevity. Standards like IES LM-79 and LM-80 provide guidelines for measuring photometric and lumen maintenance characteristics, respectively, while IEC 61000 addresses electromagnetic compatibility. Advanced instruments such as integrating spheres, spectroradiometers, and thermal cameras are employed to conduct these assessments accurately. By adhering to these rigorous testing protocols, manufacturers can guarantee that their LED products meet industry benchmarks for quality and reliability.

External links:
1 - More on Wikipedia
2 - Measurement of LEDs
3 - OLED Production: Composition and Color Patterning Techniques