GB/T 39771.1-2021 in English
VALIDOptical radiation safety of LEDs—Part 1: Safety requirements and classification
- Issued on:2021-03-09
- Implemented on:2021-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 39771.1-2021半导体发光二极管光辐射安全 第1部分：要求与等级分类方法》由339-1（工业和信息化部（电子））归口，主管部门为工业和信息化部（电子）。
Introduction
Analysis of the core content of the standard
GB/T39771.1-2021 puts forward systematic requirements for the light radiation safety of semiconductor light emitting diodes (LEDs) in the wavelength range of 300nm~780nm. The standard innovatively establishes a four-level classification system (class 0 to class 3) to control risks through the dual indicators of reachable emission value and safe distance.
Key Hazard Types and Limits
| Hazard Type | Action Spectrum | Benchmark Limit | Time Dependence Formula |
|---|---|---|---|
| Eye/Skin UV Hazard | SUV(λ)(300-400nm) | 30J·m⁻² | ES=30/tmax |
| Retinal Blue Light Hazard | B(λ)(300-700nm) | 106J·m⁻²·sr⁻¹ | B=106/tmax |
| Blue light hazard of small light source | B(λ)(300-700nm) | 100J·m⁻² | EB=100/tmax |
Key points of grade classification technology
Class 0 (exempt class) typical scene
General lighting When the class=instrument>LED lamp is tested at a distance of 200mm: the retinal blue light hazard radiance is ≤100W·m⁻²·sr⁻¹ (tmax=10000s), and the near-ultraviolet irradiance is ≤10W·m⁻² (tmax=1000s).
Class 2 (moderate hazard) control requirements
The warning "Do not look directly at the light source" must be indicated in the product label. For example, a high-brightness LED projection light source may reach a blue light hazard value of 400W·m⁻²·sr⁻¹ under short-term exposure (≤0.25s).
Protection of special groups
Appendix A specifically regulates the retinal UV protection of aphakic people. The weight of its action spectrum function A(λ) in the 300-315nm band is significantly higher than that of the general population:
- Class 0 limit: 100W·m⁻²·sr⁻¹ (10000s)
- Need to use UV-filtering intraocular lens
Implementation suggestions
- Test distance standardization: 200mm reference distance is uniformly used for initial classification
- Application scenario adaptation: Converging optical systems need to re-evaluate their hazard level
- Dynamic control: LEDs with pulse width <0.25s need to be calculated according to peak power
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