spectra led grow light aging test

LED light-emitting principle:

LED industry in China started in the 1970s. After 30 years of development, China’s LED industry has initially formed a relatively complete industrial chain, including the production of LED epitaxial wafers, LED chips preparation, LED chip packaging and LED product applications, including.

LED lighting LED III – IV compound, such as GaAs (gallium arsenide), GaP (phosphide gallium), GaAsP (gallium arsenide phosphide) and other semiconductor made of, its core is a PN junction. So it has the general PN junction IN characteristics, namely the forward pass, reverse-blocking breakdown characteristics. In addition, under certain conditions, it has a light emitting characteristic. Forward voltage, electrons from the N-region into the P region, the injection of holes from the P region N region. Into each other regional minority carriers (minority) part of the compound and shine with the majority carrier (number of children). Assume that luminescence occurs in the P region, the injected electrons and valence band holes directly composite and light-emitting, or first captured by the luminous center hole recombination. In addition to this light-emitting compound, also some electronic non-luminescent center (the center between the conduction band, dielectric tape near the middle) capture, and then with the hole recombination, the energy of each release is not and can not form visible.

Market for LED lighting products spectra led grow light:

LED explosion proof light source that some people call the long life lamps, which means the light never goes out. Solid cold light source, epoxy encapsulated, light body and no loose parts, there is no filament light easy to burn, heat deposition, the light fades and other shortcomings, the service life of up to 60,000 to 100,000 hours, longer life than traditional light source 10 times or more.

spectra led grow light aging test

Therefore, to achieve this ideal state, the anti-aging ability is particularly important.

Content:

Aging test of an LED lighting products spectra led grow light:

LED backlight and lighting products for a long time aging test is a very important test, aging test can be detected early fault LED products in the long-term use may produce light fades, color temperature change, leakage, and conducive to the stability of the product. The ITECH power and burn-in test software is mainly used in aging test LED backlight and lighting products.

LED the aging lighting products test results and use of equipment have a great relationship, aging equipment and LED lighting products, must be guaranteed in the full heat of cases to determine the best time of aging, by aging system monitoring data, analysis and comparison, to get the most accurate test data, so as to achieve the purpose of the production and testing.

Second, LED aging test application of the power supply and the aging system should have features:

LED current work is very special, the test system in order to obtain reliable data. In general, the power LED aging test application and aging system should have the following characteristics:

1, high power than the NC DC power supply, wide voltage and current usage, the wide range of applications spectra led grow light;

2, can automatically control the rate of change of the voltage and current, the maximum possible reduction in cost;

 

spectra led grow light and LED PCB

1 Introduction

With the rising awareness of global environmental protection, energy saving has become the trend. The LED lights industry is one of the industries most attention in recent years. Now, LED products are energy saving, energy-saving, high efficiency, fast response time, long life cycle, and does not contain mercury, with environmental benefits and advantages. General, however, LED high power input power of approximately 20% can be converted into light, and the remaining 80% of electrical energy is converted into heat.

In general, the heat generated by LED light can not export, will make the LED junction surface temperature, thereby affecting the product life cycle, luminous efficiency, stability, and the LED junction surface temperature, luminous efficiency and life relationship, the following diagram for further instructions.

spectra led grow light and LED PCB

2, the LED thermal path

Depending on the packaging technology, the cooling method also is different from the LED variety of thermal path method can approximate Figure III indicate the:

In general, the LED grain (Die) to fight the golden thread, eutectic or flip chip way to link its substrate (Substrate of LED Die) and the formation of an LED chip (chip), then then the LED chip is fixed on the system circuit board (System circuit board). LED possible thermal path for heat directly from the air (shown in three ways 1), or by the LED die substrate to the system board to the atmospheric environment. Heat from the system board to the rate of the atmospheric environment depends on the entire LED lighting system design.

However, at this stage of the cooling of the entire system bottlenecks, mostly dominated in the heat conduction from the LED die to the substrate to the system board. Possible in this part of the cooling channels: one for direct by grains substrate cooling to the system board (Figure 3 ways 2), this thermal path, heat dissipation capability of the LED die and the substrate materials is quite important parameters. On the other hand, the LED generated by the heat will be through the electrode metal wire to the system board, in general, the use of gold thread to do the cooling by the metal wire electrode junction, more slender geometry limited (such as three way 3); Therefore, the eutectic (Eutectic) or flip chip (Flip chip) bonding recently, this design significantly reduce wire length, and a substantial increase in wire cross-sectional area, this way, by the LED electrode the cooling efficiency of the wires to the system board will effectively improve (Figure 3 way and 4 below).

Explained through the thermal path above, learned that the choice of the heat the substrate material and its LED die packages accounted for a very important part in the management of LED street lights heat dissipation, and back outline for LED heat dissipation substrate.