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Lamp bead life test

LM-80 LED bead life testing is a standardized testing method used to evaluate the luminous flux maintenance rate of LED packaging, arrays, and modules, aiming to predict the life of LED beads through long-term testing data. The following is a detailed explanation about the life test of LM-80 lamp beads:

 

1. Overview of LM-80
Full name: LM-80《Approved Method: Measuring Luminous Flux Maintenance of LED Packages, Arrays, and Modules》。

Publisher: Illuminating Engineering Society of America (IES).

Purpose: To evaluate the luminous flux maintenance rate of LED chips through long-term testing data.

 

2. Testing principle
Luminous flux maintenance rate: The luminous flux of LED beads gradually decreases with increasing usage time.

Test time: At least 6000 hours of luminous flux attenuation data.

Test conditions: Conduct a lifespan test under rated conditions and record the changes in luminous flux over time.

 

3. Main testing items
(1) Luminous flux
Definition: The total amount of light emitted by an LED bead, measured in lumens (lm).

Test method: Measure the luminous flux of LED beads using an integrating sphere and a photometer.

(2) Luminous flux maintenance rate
Definition: The ratio of the luminous flux of LED beads at different time points to the initial luminous flux.

Test method: Regularly measure the luminous flux of LED beads and calculate the luminous flux maintenance rate.

(3) Color stability
Definition: The changes in color temperature and color rendering index of LED beads at different time points.

Test method: Use a colorimeter to measure the color temperature and color rendering index of LED beads.

 

4. Testing equipment
Integral sphere: used for measuring luminous flux.

Photometer: used to measure light output.

Colorimeter: used to measure color temperature and color rendering index.

Lifetime testing equipment: used for long-term monitoring of the luminous flux and color stability of LED chips.

 

5. Corporate Responsibility
(1) Product Design
Optimize LED bead design to improve luminous flux maintenance and color stability.

Choose high-quality LED chips and driver circuits to reduce light flux attenuation and color drift.

(2) Compliance testing
Ensure product compliance with relevant standards through LM-80 lifespan testing.

Prepare complete technical documents, including test reports, design drawings, etc.

(3) Labels and identification
Mark the luminous flux maintenance rate and lifespan prediction results on the product.

Provide instructions for use, including applicable conditions, safety precautions, etc.

 

6. Summary
LM-80 LED bead lifespan testing is a standardized testing method used to evaluate the luminous flux maintenance rate of LED packaging, arrays, and modules, predicting the lifespan of LED beads through long-term testing data. Enterprises need to optimize product design, ensure product compliance with relevant standards through LM-80 life testing, fulfill compliance responsibilities, and enhance product quality and market competitiveness.

6 individual

Large-scale experimental base

150 individual

Professional Lab

30 All kinds of

Analysis Method

8 million times

Testing/year