It mainly includes luminous flux and luminous efficiency, light intensity and light intensity distribution characteristics, and spectral parameters.

Luminous flux and luminous efficiency: There are usually two methods, the integrating sphere method and the variable angle photometer method. Although the latter test results are the most accurate, the former is generally used due to the time-consuming process. When testing with the integrating sphere method, the LED lamp bead to be tested can be placed in the center of the sphere or on the wall of the sphere. After measuring the luminous flux, the cooperative electrical parameter tester can measure the luminous power of the LED lamp beads, that is, the luminous efficiency.

Light intensity and light intensity distribution characteristics: Because the light intensity distribution of LED lamp beads is inconsistent, its test results change with the test distance and the size of the detector aperture, allowing each LED lamp bead to perform light intensity under the same conditions. Tests and reviews, so the results are more accurate.

Spectral parameters: mainly include peak emission wavelength, spectral radiation bandwidth and spectral power distribution. The spectral characteristics of LED lamp beads can be represented by spectral power distribution, and chromaticity parameters can also be obtained through spectral power distribution. Generally, the test of spectral power distribution needs to be carried out through spectroscopy, and the monochromatic light in the mixed light is distinguished one by one for measurement. Prisms and gratings can be used to achieve light separation.

2. Electrical characteristics

The electrical characteristic parameters of LED lamp beads include forward current, forward voltage, reverse current and reverse voltage. This test is generally carried out using a voltammeter, under the condition of constant current and constant voltage source power supply. The parameters of the maximum allowable forward voltage, forward current, reverse voltage and current can be obtained through the test of the z electrical characteristics of the LED. In addition, the optimal operating electric power value of the maximum LED value can be obtained.

3. Switching characteristics

It refers to the light, electricity and color change characteristics of the LED lamp bead at the moment of power-on and power-off. After this test, the operating conditions and material properties of the LED lamp bead can be obtained at the moment of power-on and power-off, so as to understand the effect of power-on and power-off on the LED lamp. loss of beads.

4. Color characteristics

There are mainly chromaticity coordinates, dominant wavelength, color purity, color temperature and color rendering, etc., and the test methods include spectrophotometry and integral method.

Spectrophotometry: The spectral power distribution of the LED lamp bead is obtained by spectroscopic measurement of the monochromator, and then the corresponding chromaticity parameters are obtained by integrating the chromaticity weighting function.