LED light performance continued to improve, in order to achieve high brightness requirements, but also the power to increase the number of single components, especially high fever followed by running the state, probably because of heat issues, so the light fades or the life of the component relatively lower, but if the components are in the front-end process needs to consider the heat than from the external conditions to be more efficient thermal design, sustainable development can also be higher-power, high brightness LED components in response to daily lighting applications.
Last few years, environmental issues continue to heat up, so that the status of electricity there is a great change, there are a number of great Terminal electrical changes, such as CRT TV to be replaced LCDTV, and even a large number of energy-intensive incandescent light, has become the source countries have been disabled.
Because 19% of observed global energy consumption is used for lighting applications, if they can import energy-saving lamps in general lighting, for global energy consumption could produce significant savings results, so the governments of countries in order to create a more environmentally friendly image also actively through policy, regulations and industry guidance towards the direction of energy-efficient lighting applications, while the use of the original modern LED or CCFL light source designed to replace traditional light sources, for everyday lighting applications, lighting has become an important industry trends.
The status of the application of traditional light sources
Most practical applications, the still large number of high-performance, high-brightness light source, for example, street lighting, store lighting, shop lighting, etc., to be efficient, high brightness lighting facilities, mostly using high-intensity gas discharge lamp (High- intensitydischarge; HID) or halogen, in order to achieve high brightness, high-illumination applications; while in the store, the store's demand for a long time, most use fluorescent tubes (CompactFluorescentLamp; CFL); housing is still more extensive use of incandescent, fluorescent (CFL ), or the demands of the new power saving light bulbs. In many practical applications, the highest energy efficiency should be the worst incandescent light mainly because the application makes a lot of power when converted into useless heat also makes lamp life is lowered.
To observe the specific source application, general lighting market application areas covered by the very broad, including building lighting, signs, landscape lighting, retail, lights, street lighting and residential lighting. To discuss the energy efficiency of existing lighting on the need for scientific evaluation of the proposed methods, such as input power ratio and the actual output lumen for the performance measure, is also more than the number of lumens per watt for the implementation of baseline assessment (or energy efficiency efficacy) evaluation.
Different lighting energy efficiency gap between the program
Observation of the existing lighting applications, the energy efficiency of incandescent lighting, the worst solution, for example, using 60W incandescent lamp according to its name for the energy efficiency of about 10lm / W, compared with CFL fluorescent energy efficiency up to 50lm / W. A 100WHID can have 80lm / W, equivalent to produce 8,000 lumens brightness.
LED light source significantly improved performance and usability
LED characteristics is in itself is an electronic component, and the HID gas discharge lamps, CFL lamps with this type of light source, it is necessary to built high-pressure glass container is relatively smaller volume of gas, filled without toxic elements, groups piece itself has a metal contact, and can be mounted on any surface welding, convenience is very high.
LED light source with the next number of advantages, including energy efficiency is the focus of most businesses.
LED technology was limited due to the past, can not effectively enhance the brightness, for indicative use more auxiliary light source, but now the white LED as an example, had significantly improved production methods, for example, by high-performance phosphor coated blue LED generates approximately white glow, while substantially increasing the brightness of a single component output, white LED current has been significant progress in energy efficiency, color temperature performance of the 4,500 ~ 6,000 k, in the laboratory test data has to reach beyond the 200lm / W, high-performance performance.
LED are solid-state lighting components, the components of hardness, high strength, not like conventional light sources because the main is made of glass, there will be afraid to fall, intolerance impact problems, but also with a different design or with the configuration of the phosphor design, production system, the lighting effects of different characteristics, the overall assembly is not mercury, along with more than 50,000 hours lifetime, LED life over 1,000 hours of incandescent lamps can only operate to a high more.
Import life applications are still key issues to be overcome
As the LED in the original differences in physical characteristics of the device, making the concept of light source system is very different from the traditional design, the need for more technical and professional support.
LED bulb design is relatively compact in the space, how to do the relevant circuit integration, it is necessary to achieve design goals by integrating the chip.
1, optical design
LED light source is a high efficient light source, which is too concentrated light source, the application would be a lot of traditional issues, such as when the lamp use will result if close enough symmetry type of light, even if LED color control flexibility with a broad energy efficiency performance is quite good, but in life with the use of lighting applications will affect perception, a point source must be designed through the optical lens or body (lens, optical materials) to produce approximate the performance of the traditional type of light fixtures, will increase lighting costs, in a compact configuration is more difficult to break through the optical design of the physical characteristics.
2, thermal design
Similarly, the continuation of a point source LED assembly itself is limited, light components generated when the temperature in the over-concentrated in a single point on top, if not effectively deal with heat, burning will occur resulting in financial components, and even shorten life! In addition to the component itself to be designed for enhanced heat dissipation, such as gold or play through the chip carrier board design technologies improve, to achieve auto-thermal design, even so, the heat will still be over-concentrated positions in the status of point-like light , how the external components of the active cooling and passive cooling design, to improve the junction temperature control capabilities, which related to lighting design as the technology gap.
3, drive and control circuit design
Practical applications, LED drivers, LED still need a lot of auxiliary electronic circuits, to achieve the high efficiency purposes, but for the average incandescent lamp dimmer design, if you want to achieve in the new LED light source, which must be available through DC Direct Power control for power adjustment, then if taking into account the energy consumption and power efficiency, will drive the electronic circuit complexity increase substantially on the design of a very large number of independent components cause the system to the discrete design problem, so the overall savings circuit power is consumed in the relevant hand out.
Component manufacturers have already taken control of single-chip IC design dimmable, so no re-lighting industry with the development of different lighting circuits, the use of ready-made solutions can be compared to both the old light source operating experience, but also allow a more high-performance energy efficiency.
4, the power conversion circuit design
LED is generally taken to DC to DC drive, but ACLED in practical applications, more flexibility and advantages of the application, and therefore very important to the development of LED lighting is a major trend! In particular, the general life of the power source are AC power, the LED light source to spread quickly in the life of the application, the development of AC LED product design, rapid growth is related to the application of critical applications.
