[Source: Gaogong LED 's " LED Good Products" magazine March issue ]
IEC 34A/1503/DC is a technical document that further explores the assessment of retinal blue light hazards in IEC 62471. The main contents of the following are explained:
• Establish a uniform test assessment and method for retinal blue light hazards for all light sources, including general lighting fixtures, other use fixtures, LEDs, non-LEDs, white light sources, and non-white light sources.
• The association between the blue light hazard of the retina and the retinal blue light hazard generated by the light source after it is placed in the luminaire.
In this paper, the condition that the distance is 200mm and the field of view is 11mrad will be selected as the test basis. Although it is clearly stated in the standard IEC 62471 that this is a certain type of grading test condition, it does not mean that all the classifications are tested at this distance, but the lamps and luminaires mentioned in the document, including the LED modules, are under this condition. The retinal blue light hazard was measured.
Knowledge background
　　 Blue light hazard (including small light sources) mainly refers to the blue light hazard to the retina of the human eye, which is caused by the blue light band in the spectral distribution of the light source.
For general light sources, considering the source of blue light hazard is mainly considering the two conditions of light source size and exposure time. The degree of damage is reflected by the blue light radiance LB, which is proportional to the light intensity of the light source itself; or by blue light irradiation. Degree EB is reflected in proportion to the illumination received by the human eye. For small light sources (with a corner angle of less than 11 mrad), assessing the degree of retinal blue light hazard can only be reflected by the blue irradiance EB.
However, regardless of the size of the light source, according to the relationship between the angle of the light source and the field of view as stated in IEC 62471, we can conclude that the field of view curvature of the human eye is fixed at 11 mrad when the exposure time is greater than 10 s. It can be seen that when assessing the retinal blue light hazard, the exposure time of 10s will be an important assessment point.
When the boundary of the light source is between the ordinary light source and the small light source, both the blue light irradiance and the blue light radiance LB can reflect the degree of blue light hazard. The conversion formula between the two is:
In IEC 62471, different lamps or luminaires are mainly divided into two categories, general lighting lamps and the remaining light sources. For general lighting type lamps (GLS), the hazard value test distance should be given at a distance of 500 lx illuminance, but this distance cannot be less than 200 mm. The hazard values ​​of the remaining light sources are given at a distance of 200 mm.
However, the actual use often does not appear completely in accordance with the standard. It will encounter the use of an ordinary lighting type lamp, but the actual use is greater than 500lx, or it may also encounter an exaggerated hazard. Therefore, in the case of uncertain actual use, this paper uses the test conditions of distance of 200mm and field of view of 11mrad for the blue light hazard of all samples to judge the sample.
Unfinished , please refer to the March issue of Gaogong LED 's " LED Good Products" magazine.
IEC 34A/1503/DC is a technical document that further explores the assessment of retinal blue light hazards in IEC 62471. The main contents of the following are explained:
• Establish a uniform test assessment and method for retinal blue light hazards for all light sources, including general lighting fixtures, other use fixtures, LEDs, non-LEDs, white light sources, and non-white light sources.
• The association between the blue light hazard of the retina and the retinal blue light hazard generated by the light source after it is placed in the luminaire.
In this paper, the condition that the distance is 200mm and the field of view is 11mrad will be selected as the test basis. Although it is clearly stated in the standard IEC 62471 that this is a certain type of grading test condition, it does not mean that all the classifications are tested at this distance, but the lamps and luminaires mentioned in the document, including the LED modules, are under this condition. The retinal blue light hazard was measured.
Knowledge background
　　 Blue light hazard (including small light sources) mainly refers to the blue light hazard to the retina of the human eye, which is caused by the blue light band in the spectral distribution of the light source.
For general light sources, considering the source of blue light hazard is mainly considering the two conditions of light source size and exposure time. The degree of damage is reflected by the blue light radiance LB, which is proportional to the light intensity of the light source itself; or by blue light irradiation. Degree EB is reflected in proportion to the illumination received by the human eye. For small light sources (with a corner angle of less than 11 mrad), assessing the degree of retinal blue light hazard can only be reflected by the blue irradiance EB.
However, regardless of the size of the light source, according to the relationship between the angle of the light source and the field of view as stated in IEC 62471, we can conclude that the field of view curvature of the human eye is fixed at 11 mrad when the exposure time is greater than 10 s. It can be seen that when assessing the retinal blue light hazard, the exposure time of 10s will be an important assessment point.
When the boundary of the light source is between the ordinary light source and the small light source, both the blue light irradiance and the blue light radiance LB can reflect the degree of blue light hazard. The conversion formula between the two is:
In IEC 62471, different lamps or luminaires are mainly divided into two categories, general lighting lamps and the remaining light sources. For general lighting type lamps (GLS), the hazard value test distance should be given at a distance of 500 lx illuminance, but this distance cannot be less than 200 mm. The hazard values ​​of the remaining light sources are given at a distance of 200 mm.
However, the actual use often does not appear completely in accordance with the standard. It will encounter the use of an ordinary lighting type lamp, but the actual use is greater than 500lx, or it may also encounter an exaggerated hazard. Therefore, in the case of uncertain actual use, this paper uses the test conditions of distance of 200mm and field of view of 11mrad for the blue light hazard of all samples to judge the sample.
Unfinished , please refer to the March issue of Gaogong LED 's " LED Good Products" magazine.
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