Several factors to judge the quality of LED
As a light source with high luminous efficiency, energy saving, long service life and easy maintenance, LED has been applied in many night lighting projects. However, due to its small size, high brightness, and PN junction characteristics, LEDs currently have many new problems in the evaluation of LED quality. Judging the quality of an LED can not be generalized. Because in different applications, the performance requirements of LED products are also different. For example, the LED used for display refers to its brightness, viewing angle distribution, color and other parameters. For LEDs used for general illumination, look at parameters such as light flux, color, and color rendering characteristics. In addition, we must judge the quality of LEDs from the comprehensive evaluation of optical, electrical, and thermal radiation safety and life parameters.
The PN junction temperature for power LEDs is considered in terms of heat dissipation performance
In order to achieve higher power and luminous efficiency of the LED, it is particularly important to solve the PN junction temperature and the heat dissipation problem of the housing for the power LED for illumination. Judging the thermal performance of LEDs is generally expressed by parameters such as thermal resistance, case temperature, and junction temperature.led tube light
Optical performance considerations for different applications of LEDs
Since LEDs for display are focused on visual and intuitive effects, there is no particular requirement for color temperature and color rendering related indices. Contrary to this, white LEDs for lighting pay great attention to the correlated color temperature and color rendering index, because this is an important indicator to create a lighting atmosphere and effect, but there is no special requirement for color purity and dominant wavelength. At present, countries are developing new LED industry standards and test methods. LEDs can also be derived from luminous flux, axial luminous intensity, beam half-intensity angle, spectral radiation bandwidth, radiant flux, luminous efficiency, luminescence peak wavelength, correlated color temperature, color purity, and The parameters such as dominant wavelength and color rendering index were evaluated.
Considering the electrical properties of semiconductor light-emitting diodes from the electrical properties of LEDs
The PN junction characteristics of LEDs are characterized by unidirectional nonlinear conduction characteristics, low voltage drive, and sensitivity to static electricity. Unlike the electrical characteristics of traditional light sources, the main measurement parameters include forward drive current, forward voltage drop, reverse leakage current, reverse breakdown voltage, and electrostatic sensitivity.led bulb light
Radiation safety considerations for biological or human body for LED light sources
Since LED is a narrow beam, high-luminance illuminating element, its radiation may cause harm to the human retina. Therefore, the International Electrotechnical Commission IEC specifies the limits and test methods for effective radiation for LEDs used in different occasions. An important factor in the quality of LED. Among them, the EU and the United States have implemented mandatory radiation safety testing of LEDs.led flame bulb
Reliability of LED operation and length of life
In particular, LEDs are more important as LCD backlights and large screens. The length of life of the LED we evaluate does not refer to the usable period from use to damage, but to the time it takes for the LED to decay to a specified percentage of the initial value at rated power. The longer the duration, the longer the life of the LED.led ceiling light
Dalian Xinghai Technology Co., Ltd.