LED light hazard rating and measurement standards
LED blue light hazard investigation is blue light radiation in the retina to produce photochemical damage.In practice, people may watch from different angles or lamps and lanterns of lighting on the surface of the different areas.Therefore, in order to meet the various application of IEC 62471, blu-ray hazards should be based on the shiny surface maximum brightness area on the maximum radiation direction of radial values (weighted irradiance and weighted radial brightness) security level classification.LED light harm main measurement evaluation standard of IEC/TR and IEC62471, IEC 62471-2, 62778 GB/T 20145-2006, using the IEC/IEC 60598-1 the TR 62778 "Application of IEC 62471 for the assessment of blue light hazard to light sources and luminaires".IEC/TR 62778 is on the basis of IEC 62471, about the danger of light source and the blue light of lamps and lanterns made a simplified measurement evaluation.
1) LED light source measurement
Light source is mounted on the 5 d position control system, in determining the brightness after the biggest exposure to radial position and radial brightness, system light source, in turn, can be aimed at measuring equipment, and test the brightness of the light source, radial brightness, and spectral data, automatic computing weighted radial brightness LB and Ethr blu-ray harm, and the process as shown in figure 1 to blue light hazard classification.
2) a measure of the LED lamps and lanterns
If the light source of hazard information known, lamps and lanterns manufacturers can according to the data provided by the process as shown in figure 1 to hazard classification of lamps and lanterns.If the light source of lamps and lanterns is installed in the fall on Ethr for RG2 category or for small light source, the system can also be used to measure the minimum distance dmin safe use.
If the light source information is unknown, lamps and lanterns manufacturers can also use the system to measure the brightness of lamps and lanterns, radial brightness and spectral information, in accordance with the standards of IEC or IEC 62471 / TR 62778 requires the blu-ray hazard classification of lamps and lanterns.The luminance measurement conditions should be consistent with the actual application conditions as far as possible, including the condition of the lamps and lanterns, test distance, measurement field Angle, etc., to the safety of the lamps and lanterns for effective classification.
Shown in figure 2 as light source and lamps and lanterns blu-ray hazard comprehensive test system, the system integrates the high resolution imaging luminance meter as well as the high resolution spectrum radiometer, can accurately realize the light source and the harm of lamps and lanterns of weighted radial brightness, brightness, harm the weighted irradiance, intensity of illumination, spectrum, KB, V and Ethr parameter measurement.
The expansibility of the system is very strong, can be flexible configuration of various kinds of measuring instrument, testing required by the IEC 62471 full light biohazard parameters, and hazard rating of metering source or lamps and lanterns, can meet the requirement with multiple measurement occasions, such as certification laboratory, product variety of lamps and lanterns manufacturers, etc.
In addition, the system can also by IEC 62471 and IEC/TR 62778 comparing two standard test, to help manufacturers according to the actual application situation to identify the real hazard rating of lamps and lanterns.
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