White LED into the indoor lighting trend gradually become

Development of white LED success, really ignited the "green lighting" glory. With the development of LED technology, LED is gradually from the stage of development, display signal to the lighting application stage, long lifetime, high efficiency and low energy consumption has been recognized, the white LED is indoor lighting has been used more and more widely.

Many advantages of white LED

The application of white LED in indoor lighting has many advantages. First, the brightness and color of the LED can be adjusted to meet the requirements of the indoor decorative lighting on the color, in the development of the scene lighting market, with the advantages of traditional light can not be compared. Second, LED to perform dynamic control, according to the needs of the design of cluster user control, in need of some programming skills of the occasion, can provide a reasonable solution, for the intelligent management of indoor lighting to provide convenient. Third, LED small size, more decorative features, through the design of the lamp can be integrated with the building, to see the light does not see the effect. Fourth, LED long life, mercury free, in line with national policy of energy conservation and emission reduction. In fifth, LED in a certain angle beam directional radiation, used for lighting, lights and lamps, is conducive to the improvement of downshot flux ratio.

With the decline of LED technology promotion, energy-saving effect appearance and cost, both in the international market or the domestic market, LED has begun to enter the commercial lighting and even some domestic lighting market, showing a good momentum of development. In indoor lighting applications widely at present LED price is still very expensive, but because the light efficiency LED lamp with high power consumption, can save cost, and long life, can reduce the replacement and maintenance costs, therefore, in consideration of the white LED lighting development direction, compared with the traditional way of lighting (incandescent lamps, halogen lamp, compact fluorescent lamp, fluorescent lamp and metal halide lamp), white LED lamps of the return on investment is the most important factor. After analysis, compared with incandescent lamp, LED lamp investment payback period of 1.7 to 3.4 years; relative to halogen lamp, LED lamp investment payback period of 1.7 years to 3.5 years. Therefore, instead of incandescent and halogen lamps, the application of white LED has a very attractive rate of return on investment. Compared with compact fluorescent lamps, in some applications, LED lamp investment payback period of 4.5 to 6.2 years; compared to straight tube fluorescent lamps and metal halide lamps, LED lamps do not have good payback period performance.

The author believes that the white LED in the application direction of indoor lighting is mainly concentrated in several aspects: first of all, should be replaced by the low light efficiency of traditional light source, such as incandescent lamps, halogen lamps, LED lamps should vigorously develop can achieve the same lighting effect, gradually replace the compact fluorescent lamp. In such applications, LED lamps need to meet the lighting effect under the conditions of the pursuit of the appropriate service life and the optimal price. Secondly, it can be applied in the field of directional lighting, including spotlight, bright lights and local lighting, which can maximize the small size of the LED light source, directional lighting characteristics. For directional lighting applications, it is critical to ensure a large amount of light reaching the mission area and light quality. The LED lamp can meet the requirements of light intensity, light distribution and color rendering. Finally, the scene and controlled lighting. LED light source is rich in color, full color light source, while the LED light source response fast, short start-up time, easy dimming. Play the advantages of LED light source, LED light can be applied to do lighting environment color transformation, and is used for dimming, frequent opening scene lights.

Key technologies need to break through

Although the white LED in the field of indoor lighting applications continue to expand, but the white LED lighting is also facing many challenges. LED lights not only need to pay attention to the chip or package devices related performance, but also need to focus on LED lighting supporting electronic technology, thermal management and optical technology, etc..

The first is the driving problem. LED can only use DC drive, can not be applied at both ends of the LED alternating current or voltage. At the same time, in order to obtain high quality lighting effect, so that the output of LED stable, long life flux, LED input current needs constant. But the existing power supply system usually uses 120V or 220V alternating current. On the other hand, due to the low power consumption of the LED light source, it is necessary to match the LED control device (including the driver) in the rated state to consume a small amount of power. In order to meet the safety requirements, the LED control device also need to assess the power factor of the LED and the combination of the light source at rated voltage and frequency. In view of the inherent characteristics of the switching power supply, part of the high power factor power consumption has been close to the driver itself adapted LED products, therefore, in the design of LED driving source, should focus on the LED device to control the energy efficiency rating, the appropriate balance between power factor. At the same time, LED driven dimming or control is also a hot spot in the current driving technology, should be based on the needs of different scenarios, control LED lights switch, or adjust the output of the LED light flux. At present, the main research contents of LED drive technology are to improve the control precision, improve the power factor and reduce the power consumption.

Followed by thermal management technology. Heat accumulation not only affects the electrical performance of LED, but also may lead to the failure of LED. Therefore, in order to ensure the life of the LED lamp, heat dissipation has become a key technology in the application of white LED, reducing or rapidly dissipating the heat generated by LED becomes the primary problem in the design of white LED. Excellent thermal management technology can further improve the system