China has rich resources of non-ferrous metals, gallium, indium-rich, the world's total reserves of 70% -80%, which makes the development of semiconductor lighting industry in China has the advantage of resources. By 2010, the Chinese LED industry output will exceed 150 billion yuan. As early as 2002, Japan spent ¥ 5 billion to implement white light illumination, the program's budget of 60 billion yen.
With the rapid growth of LED penetration, along with the price war will come in 2010, because unlike the traditional lamp and LED downlight source separate from the sales model, in this pressure, some companies can not take into account quality and price competitiveness, may will fall to the merger or be doomed.
May 7, 2010 -12, Henan Province, lighting, lighting experts and entrepreneurs learn to organize his party visited Japan Japanese lighting situation, found that Japan's current situation is not satisfactory LED lighting.
In recent years, in light of the most interesting event is the rise of the semiconductor lighting. The mid-1990s, Japan's Nichia Corporation Nakamura, who through unremitting efforts, broke through the manufacture of blue light-emitting diode (LED) of the key technologies, and thus developed a fluorescent material to cover the blue LED technology produces white light source .
led the LightEmittingDiode (light emitting diode) acronym. New solid-state light-emitting diode is a cold light source, LED's most notable feature is the long life, high photoelectric conversion efficiency, good seismic performance, ease of use in the lighting system more widely. Under the same illumination, LED tube and power consumption than incandescent and fluorescent lifetime have clear advantages.
White light of various methods of development, and development of next-generation phosphors, LED luminous efficiency has led to a substantial increase in current industrial products from 45lm / w up to 100lm / w (2009, Cree's cold white light efficiency when at 350mA over 100lm / W, while the warm white light is more than 75lm / W), the level of research 160lm / w, the highest level of expectations of the target 200lm / w or more. Life of 40,000 to 80,000 hours.
The development will reduce the heat LED light output, causing the color change, while reducing component life. Said thermal management is by far, the most critical of the LED system design aspects. From an engineer's point of view, this means learning across the structure and tools commonly used in electronic design, electronic design to be familiar with the structure and outside the scope of the process. Fortunately, we already have thermal design solutions, validation and testing in the heat challenges, design engineers can help simplify the road.
Developing a new light system, must verify the most basic product concept, the structural and aesthetic ideas and thermal properties of the actual needs can be unified.
The key success of the LED system design activities, equipment, heat is effectively carried over from its move to the PN environment. PCB and solder the LED housings are involved in the heat flow path. Design engineer must determine the transfer of heat in the shell and shields demonstrated efficiency. Series of physical samples manufactured and tested to verify this is expensive and requires more time, therefore, has the early stages of design engineers in the design of commonly used software-based approach.
More popular approach is to use computational fluid dynamics (CFD = Computational Fluid Dynamics) analysis to simulate the planned virtual devices. For early design concepts, this approach to be flexible than building a lot of physical samples, and just as effective. That the characteristics of a good virtual model, the physical samples can be clear on the basis of what works and what does not. All along, CFD simulation by some of the fluid with a high-level data and analysis of background people to operate, it requires the implementation of personnel in the analysis of complex CFD modeling tools.
Design verification of the bottom line, whether the product is a new source or modify an existing design, should be a detailed understanding of the thermal performance of LED bulb. If the development of new LED lamps in place of existing equipment, then learn more about the thermal performance is also very important, because the original installation of thermal performance and lighting facilities is the key.
Thermal data from LED suppliers should get the hands, although in the current industry standard in the absence of such information, product specifications in the printing, the information provided is usually not comprehensive enough. For example, the thermal performance data are usually provided, but it may not include the operating temperature range, the actual end-user systems in which the temperature of the work areas. However, design engineers must rely on LED manufacturer's data or simple models to evaluate the implementation of light, or in-house testing, or start early light design.
