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The six design steps of the system design: (1) determine the lighting requirements; (2) determine the design objectives

Gauge optics; (3) the efficiency of thermal and electrical systems; (4) calculate the number of LED required; (5) all designs may be considered, and the best design is selected; (6) the final steps are completed. Although this paper takes an indoor lighting design as an example, the design process can be used in any LED lighting design.

Now the application of LED lighting, with ordinary lighting required brightness, efficiency, service life, color temperature and white point stability. Therefore, the vast majority of ordinary lighting applications are used in the design of this type of LED, including road, parking area and indoor lighting direction. In these applications, the LED based lighting reduces the overall cost of ownership (TCO) due to the need for maintenance (since LED is much longer than the conventional one) and the energy consumption is reduced.

More than 20 billion of the world's lamps use incandescent, halogen or fluorescent lamps. Many of them are used as directional lighting, but are used in all directions. The United States Department of energy (DOE) said that in the new residential buildings, the roof is the most popular lighting installation. In addition, the DOE reported that the use of non reflective lamp ceiling light efficiency is only 50%, that is to say, half of the light generated by this kind of light is wasted in the lamp. In contrast, the lighting level LED has at least 50000 hours of high efficiency, directional illumination. The use of lighting level LED all the advantages of interior lighting design has the following advantages:

1 efficacy over all incandescent and halogen lamps

2 comparable performance with even the best CFL (compact fluorescent) ceiling lamps

3 compared with these lamps, the need to maintain the life expectancy of 5 to 50 times

4 to reduce the impact of light on the environment: mercury free, small power plant pollution, low waste disposal costs.

Lighting or light?

The design of LED in general lighting requires a choice between the two methods, the design of a LED based complete lighting, or the design of the installation of the existing lamp based on LED lights. In general, a complete lighting design, the optical, thermal and electrical performance is better than the style of the renovation of the lamp, because the existing lamps will not restrict the design. It is more important for the application of the target, whether it is the overall performance of the new lighting system or the convenience of the refurbished lamp, which is decided by the designer.

Aiming at the existing lighting design method

If the goal of the application of the construction of a new type of LED lighting is better, then the design of lighting output light to make it equal to or exceed the existing lighting matching has a variety of advantages. First of all, the existing design has been optimized for the target application, can provide guidance on the design objectives around the light output, cost and work environment. Secondly, the design of the existing size has been recognized. If the size of the same size, the end user into LED lighting easier. Unfortunately, some LED lighting manufacturers reported errors or exaggerated the efficiency and service life of LED lighting.

In the early years of CFL replacement bulbs, the lighting industry also encountered similar problems. The lack of industry standards, as well as the huge differences in the quality of early products, have delayed the adoption of CFL technology for many years. The U.S. Department of energy is aware that the early LED lighting may also have the same standards and quality problems, and these problems may delay the use of LED lighting in a similar way. As a response, the U.S. Department of energy launched the DOE SSL commercial product test plan (CPTP), the LED lighting manufacturers to test the indicators claimed. The program is designed to test the following 4 characteristics of LED lighting in an anonymous manner: lighting output (Liu Ming).

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