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Generally, LED lamps are required to conform to the specified photoelectric characteristics. The electrical characteristics can be tested by a power meter, and there are few targets. The optical characteristics are too many targets. And they should be tested by special instruments. It is particularly important for LED lamps, which mainly includes two aspects, optical characteristics and color characteristics. The two characteristics directly affect our normal lighting and are helpful to protect our eyesight, Together, it can meet the national lighting requirements

One is light characteristics, which mainly includes luminous flux and light effect, light intensity and light intensity dispersion characteristics and spectral parameters.

1. Spectral parameters: mainly including peak emission wavelength, spectral radiation bandwidth and spectral power dispersion. The spectral characteristics of LED can be shown by spectral power dispersion. After spectral power dispersion, chromaticity parameters can also be obtained. Generally, the test of spectral power dispersion needs to be carried out through light splitting. The monochromatic light in the mixed light can be distinguished one by one for measurement. Prism and grating can be selected to complete light splitting.

2. Luminous flux and luminous efficiency: generally, there are two methods: integrating sphere method and variable angle photometer method. The latter has the most accurate test results, but it takes a long time. Generally, the former is selected. When the integrating sphere method is used for testing, the tested LED lamp can be placed at the center of the sphere. After measuring the luminous flux, the cooperative electric parameter tester can measure the luminous power of the LED lamp, that is, the luminous effect. The unit is LM / W. that is, the value of the luminous flux under the unit power. After knowing this parameter, the luminous flux of the whole lamp can be obtained by multiplying it by the total power

3. Light intensity and light intensity dispersion: because the light intensity dispersion of LED fluorescent lamp is inconsistent, its test results change with the change of test distance and detector aperture, which can enable each LED fluorescent lamp to test and comment on light intensity under the same conditions, so the results are more accurate.

One is color characteristics, mainly including chromaticity coordinates, main wavelength, color purity, color temperature, color rendering, etc. the test methods include spectrophotometry and integral method.

1. Spectrophotometry: the spectral power dispersion of LED fluorescent lamp is measured by monochromator, and then the corresponding chromaticity parameters are obtained by chromaticity weighting function integration.

2. Integral method: use specific color filter and photoelectric detector to directly measure the chromaticity parameters.

For the factory, it is generally convenient to use the integrating sphere test. When the test statement is issued, we will see that its basic parameters will be displayed. The optical characteristics will be displayed in the front of the statement. For example, important parameters such as color temperature, display finger, wavelength, etc. there are details for the display of color rendering index, from R1, R2 to RN. What' s more, even electrical parameters can be displayed, such as total power of the whole lamp, PF value, input voltage, etc, It is an inductive test statement

Article from: LED fluorescent tube manufacturer http://mushuren.cn/