【 Weak current College 】 LED quality testing of seven aspects 】

LED application products particularly semiconductor lighting products are becoming more and more demand for high-power led preponderance of LED's have an increasingly higher quality requirements, mainly in the following seven areas:

1. the forward voltage test: forward voltage range required in circuit design within the scope of the license, many customers design-driven led light to voltage power, forward voltage size directly affects the overall parameters of the circuit, which will bring risks to the product quality. Additionally, for some circuit power consumption is required of a product, you want to ensure that the same luminous efficiency forward voltage, the lower the better.

2. luminous flux tranche: luminous flux values is LED users very concerned about one of the indicators, led application customers must know their use of LED light flux which range in order to ensure that their own product uniformity and consistency of brightness.

3. reverse leakage current: reverse leakage current in loading certain voltage is lower than the values required in the production process due to static electricity, chip quality and other factors causing high leakage through the LED reverse, which LED application products laid great risk, in use for some time it is easy to cause the death LED lights.

4. main wavelength tranche: for monochromatic light LED, dominant wavelength is a measure of the color parameter of important indicators, dominant wavelength directly reflect the human eye LED light of the experience.

5. color index tranche: color index direct relations to light exposure to object object color, for LED lighting products, this parameter is important.

6. relative color grading: for white LED color temperature is the presentation of its colour industries with more of a parameter, which can be directly rendered out LED tone is warmer or cooler or as white.

7. the chromaticity coordinates x, y tranche: for white or monochromatic light can be used to express the color quality parameters in which color range LED, generally requires four points x, y chromaticity area determines a. Must pass certain tests means that LED really fall into the four-point x, y chromaticity area.

For the above points, we can use two scenarios for effective UV color separations, and one is from the measuring voltage to the leakage current to the luminous flux to spectra multichannel working procedure a large number of artificial facilitate quality controling and grading. One is through professional high-power led beam separations machine for automatic grading, high efficiency, high speed, can be done on every LED beam separations.

White led why do spectral color separations?

White LED lamps in the factory must undergo simultaneous color separations (no separations after UV LED some light is white, there's a partial blue, yellow), spectro separations instrument is expensive, there is no small factory in general such devices, production of white light are generally carried out by the manufacturers, because color is not the product of their own plant by separations will not be so careful. Some small factory simply not simultaneous color separations. They generally are lower prices to customers. So when purchasing white led not just for the sake of cheap, be sure to purchase the same manufacturer, same time, same colors, led luminotron single particle light or modules to produce the same batch of letters.

LED beam separations fundamentals

By infrared spectrophotometry machine head test, the LED light-emitting diode, voltage, brightness, leakage value, distinguishing, in the wavelength is put into a different material to his box!