1 Introduction
At present, high-power LED street light is high (>80 lm / w), long service life (> 50 000 h), good light output orientation, excellent color performance (75 ~ 80), color temperature and green Without pollution, more than 30% of the traditional road lighting energy saves, with high optical utilization efficiency, has developed into a very competitive fourth-generation high-quality road lighting source.
2 light distribution plan
(1) Road lighting requirements for road lighting output
The high-power LED street light in the earlier period is only to imitate the form of road lighting lamps mainly with high pressure sodium lamps. By using LEDs to replace common high-pressure soda light sources, the structure is very simple. Generally, a routine street lamp housing, a structural member, and a power LED having a large number of light output angles are generally used as the light emitting device, and the LED is simply equal to the metal plane of the reflector and heat sink, the back side is simply equal. And through the LED array is mixed with a large lamp power output and a strong light output. Since there is no secondary and three-time lighting design for the LED stream, the LED stream is not shown in Figure 1, as shown in Figure 1: The light output of the street lamp forms a circular spot on the road, resulting in roads The lighting angle in the direction is limited, and the circular spot is formed between the smoothed superimposed transition between the circular spot, and the zebra effect is formed; in the vertical direction of the road, it is not available to the light of the road without being used. Meet the requirements of road lighting on the light output characteristics.
In order to meet the requirements of pavement brightness and road surface illumination, the light intensity output curve of the street lamp must be "bat wing" type along the road direction, which satisfies the uniformity of uniformity perpendicular to the road direction. The light output light of the street lamp should be shown in Figure 2, which is a uniform spot of the rectangular, so that most of the light is distributed on the road surface, and improve the utilization efficiency of the lights as much as possible, reducing unnecessary waste.
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(2) LED and LED street lighting scheme
The street lamp is an extremely important functional lighting device. It is set to ensure the safety of night road traffic safety. Its light output characteristics must meet the visual distinguishing requirements of night car drivers and pedestrians, so the LED street light distribution plan is to On the basis of road lighting requirements, from a single LED paddle.
1.1 LED light output characteristics
With the rapid advancement of LED technology, performance indicators have improved significantly. In particular, it has greatly improved the performance of high-power white LEDs in the mainstream of the fourth generation of lighting. According to the requirements of the use requirements, the power is distinguished by the power of single-chip packages: from 1 to 10W until hundreds of tiles, hundreds of tiles inequality; from the LED package lens's lighting output light intensity characteristics, mainly: Langbert type , Lateral light-emitting type, bat airfoil, concentrating (coltach), etc., the characteristic curve of the output is shown in Figure 3.
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At present, power white LEDs are moving towards the direction of single-piece power, but due to the constraints of chip cooling bottlenecks, the single-chip ultra-large power LEDs with multi-chip combination package are relatively difficult, and the light effect is relatively low, and almost power The lower the large single-chip LED is relatively low. In the design of high-power LED street lamps, the choice of high-power LEDs requires a package characteristic, luminous efficiency, installation process requirement, secondary three-time lighting design, use environment, heat dissipation conditions, and the output characteristics of the drive controller, etc. Question, therefore a variety of factors, as well as actual applications, the mainstream trend of choosing the LED in the street lamp is: the power of a single LED is around 1 watt to several tiles, the color is better, the color temperature is consistent, the light is 90 ~ 100 lm / W's quality products are the best choice for design. At the power of the street light, the total light-emitting power is required by the multi-array hybrid; on the output characteristics of the light, there are many 朗, bat fond and concentrating applications, but it is generally directly applicable. Go to the street light, you must obtain light output characteristics that meet the road lighting requirements by reassembling the lighting design.
1.2 LED's light distribution plan
1LED a light distribution plan
During the manufacturing process of the power LED, in order to improve the light efficiency, reduce the light output loss and change the light output characteristics, the lens process is used when the package is encapsulated. This makes it possible to consider the combination of the LEDs to form a light-transmitting scheme for the light output characteristics required for road lighting. By specially designed lenses, the desired light output characteristics can be directly obtained, and thereby superimpose the total light output of the synthetic high-power LED street lamp to meet the requirements of road lighting.
● LED light distribution in oblique rectangular lens package
The principle and light output simulation of the insecus rectangular lens package (see Figure 4). The main research conclusion is:
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Specially designed LED package lens is a rectangle of the top rounding angle, the rectangular surface is arc shape, maintains a certain design angle with the horizontal plane, so that it has a controllable change in the light output direction of the LED chip. According to the usual street light installation principles, the lamp is 3 times the lamp. By calculating, the light output angle of the lamp is about 140 ° in the C0 / C180 direction, about 80 ° in the C90 / C270 direction, the elevation angle is about 10 °, and satisfactory road light can be obtained. Technology area
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