GB/T 41423-2022 in English
VALIDLED packages—Long-term luminous and radiant flux maintenance projection
- Issued on:2022-04-15
- Implemented on:2022-11-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 41423-2022LED封装 长期光通量和辐射通量维持率的推算》由TC224（全国照明电器标准化技术委员会）归口，TC224SC1（全国照明电器标准化技术委员会电光源及其附件分会）执行，主管部门为中国轻工业联合会。
Introduction
Core test standards and technical specifications
This standard refers to the ANSI/IEC standard system and establishes a complete test framework for the long-term luminous flux maintenance rate of LED package products:
The test equipment must meet the LM-80 accuracy requirements for integrating spheres, constant current sources and temperature control systems
| Measurement parameters | IES LM-80 specification | This standard adds requirements |
|---|---|---|
| Test interval | Recommended not to exceed 1000h | Mandatory ≤1000h |
| Baseline duration | Minimum 6000h | Recommended 8000h+ |
Choice and application of degradation model
Provide two degradation model evaluation paths:
- Exponential fitting function (EFF): Applicable to conventional degradation mode, requiring α＞0
- Boundary function (BF): Enabled when fitting occurs when α≤0
| Model characteristics | EFF | BF |
|---|---|---|
| Applicable scenarios | Normal decay rate | Abnormal decay curve |
| Data requirements | ＞6000h data | 3 continuous test points support |
Temperature interpolation accuracy control
Acceleration mechanism based on Arrhenius equation
When using a thermal resistance tester to obtain the shell temperature, the activation energy needs to be in the effective range of 0.1eV~1.0eV, and the recommended formula is: ΔT = (ΔEa)/(k·ln(t1/t2))
Key points for interpreting the research report
- Package identification information must include the device substrate material
- Failure type code must be recorded for abnormal samples
- Correction factor must be indicated for median life calculation
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