GB/T 33721-2017 in English
VALIDReliability test methods for LED luminaries
- Issued on:2017-05-12
- Implemented on:2017-12-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 33721-2017LED灯具可靠性试验方法》由TC224（全国照明电器标准化技术委员会）归口，TC224SC2（全国照明电器标准化技术委员会灯具分会）执行，主管部门为中国轻工业联合会。
Introduction
Interpretation of the core content of the standard
This standard systematically specifies the reliability test methods for LED lamps in terms of environmental adaptability, mechanical strength and light decay characteristics, including 14 types of special tests and 2 light flux maintenance life assessment schemes.
Comparison of key test methods
| Test items | Test conditions | Judgment criteria | Number of samples |
|---|---|---|---|
| Temperature cycle test | 250 cycles, 10K/min temperature change rate | Luminous flux change ≤10% | 5 items |
| Vibration test | 1.5-3.5g acceleration, 3 axes | No structural damage | 3 items |
| Constant humidity test | 93%RH, 168 hours | Electrical safety meets the standard | 3 items |
Luminous flux maintenance life calculation model
The standard provides two evaluation schemes:
- 1000h fast method: Calculated through LM-80 data, requiring △ts＜5℃
- Direct test method: 6000h measured data fits exponential curve, calculation formula: Lp=1/α·ln(B/φ)
Implementation suggestions
Enterprise response strategy:
- Prioritize the completion of the three basic tests in Chapters 5-7 (temperature cycle, power switch, accelerated life)
- Outdoor lamps need to add temperature shock (-40℃~70℃) and damp heat test above IP65
- For the luminous flux maintenance test, it is recommended to adopt modular pre-test to reduce R&D costs
Analysis of standard evolution
Key adjustments in the 2019 amendment:
- Revise the expression of "LED module" to "LED light source"
- Modify the life acceptance judgment condition (L1'≤L1)
- Make it clear that the light decay calculation includes the attenuation component of the light source itself
Sample only — not a preview of GB/T 33721-2017
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