With the wider application of LED products, especially the gradual increase in the demand for LED lighting, the demand for high-power LEDs is increasing, and the quality requirements for LEDs are also getting higher and higher. It is very important to select high-quality LEDs. The following are some tests on the quality of LEDs.
Forward voltage test: The range of forward voltage needs to be within the allowable range of the circuit design. Many customers design to drive the LED to light up by voltage. The magnitude of the forward voltage directly affects the change of the overall parameters of the circuit. Product quality brings hidden dangers. In addition, for some products that require circuit power consumption, it is desirable to ensure that the forward voltage is as low as possible under the same luminous efficiency.
LED lamps
Luminous flux classification: The luminous flux value is an indicator that LED users are very concerned about. LED application customers must know which range of LED luminous flux they use, so as to ensure the uniformity and consistency of their product brightness.
LED application products
Reverse leakage current test: The reverse leakage current should be lower than the required value under a certain voltage. The LED reverse leakage current is too high due to static electricity, chip quality and other factors during the production process, which will bury the LED application products. A great hidden danger, after a period of use, it is easy to cause the LED to die.
LED application products
Dominant wavelength binning: For monochromatic LEDs, the dominant wavelength is an important indicator to measure its color parameters, and the dominant wavelength directly reflects the human eye‘s visual perception of the light of the LED.
LED lamps
Color rendering index classification: The color rendering index is directly related to the degree of discoloration of the object on the object when the light is irradiated. This parameter is very important for LED lighting products.
Relative color temperature classification: The color temperature of white light LEDs is a parameter that is used more in the color industry. This parameter can directly show whether the color of the LED is warm, cold, or white.
Chromaticity coordinate x, y bin: For white light or monochromatic light, chromaticity parameters can be used to express which color area the LED is in. Generally, four points x, y are required to determine a chromaticity area. Certain test methods must be used to ensure whether the LED falls within the required four-point x, y chromaticity area.
Based on the above points, we can use two schemes for effective light separation and color separation. One is to perform quality control and classification with a large number of manual processes from voltage measurement to leakage current to luminous flux to spectrum. One is to use a professional high-power LED spectroscopy and color separation machine for automatic classification, which has high efficiency and fast speed, and can be used to separate and color each LED.