GB/T 42219-2022 in English
VALIDOptical measurement of high-power LED
- Issued on:2022-12-30
- Implemented on:2023-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 42219-2022大功率LED的光学测量》由TC224（全国照明电器标准化技术委员会）归口，TC224SC3（全国照明电器标准化技术委员会光辐射测量分会）执行，主管部门为中国轻工业联合会。
Introduction
GB/T42219-2022 Standard Overview
GB/T42219-2022 "Optical Measurement of High-Power LEDs" is an important national standard that aims to standardize the optical parameter measurement methods of high-power LEDs (HP-LEDs) in laboratory environments. This standard applies to visible light HP-LEDs and does not include other types of light sources such as AC-driven LEDs and OLEDs.
Background and Significance of Standard Formulation
With the rapid development of high-power LED technology, it has been widely used in lighting, display and other fields. However, due to the high power consumption characteristics of HP-LEDs, their optical parameters are significantly affected by junction temperature, which increases the difficulty of measurement. The formulation of GB/T42219-2022 fills the gap in this field and provides a scientific basis for ensuring the accuracy and consistency of measurement results.
Key technical points
1. Measurement conditions and equipment requirements
| Measurement conditions | Specific requirements |
|---|---|
| Junction temperature control | Temperature Control Mount (TCM), supports cooling or heating functions, to ensure stable measurement of HP-LED at specified junction temperature. |
| Ambient temperature | Should be recorded in the report, and the distance from the measured LED should not exceed 0.5m to avoid direct exposure to LED light. |
| Electrical conditions | Measurement at rated current, test equipment accuracy requirement ≤0.1%. |
2. Comparative Analysis of Measurement Methods
The standard mentions two main measurement modes: pulse mode and constant current mode. The following is a comparison between the two:
| Measurement Mode | Advantages | Disadvantages |
|---|---|---|
| Pulse Mode | Suitable for fast measurement and can effectively control the rise in junction temperature. | High requirements for equipment, requiring high-precision pulse current source and high-speed optical measurement equipment. |
| Constant Current Mode | Suitable for long-term stable measurement and suitable for multi-core HP-LED. | Junction temperature control is complex, and the forward voltage needs to be accurately extrapolated to determine the junction temperature. |
3. Implementation suggestions and precautions
Equipment selection:Select a goniophotometer or integrating sphere test system that meets the requirements of GB/T39394-2020 to ensure that it is within the calibration uncertainty range.
Operation specification:Before measurement, the extrapolated forward voltage curve needs to be verified, and the impact of the junction temperature rise in pulse mode on the measurement results needs to be evaluated.
Data recording:Record the ambient temperature, electrical parameters and junction temperature setting values in detail for subsequent analysis and traceability.
Actual application case
When a laboratory measured a 3W white HP-LED, it used pulse mode (duty cycle 1%) for measurement. By extrapolating the forward voltage curve, it was found that the increase in junction temperature caused the luminous flux to drop by about 0.4%. The constant current mode was then used to correct the measurement results to ensure the accuracy of the data.
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