Application analysis of high power LED tunnel lamp

Introduction

In recent years, in order to maintain the sustained and healthy development of the national economy, the state has increased investment in infrastructure construction, such as railway, highway construction. The demand for tunnel lights is increasing. In order to save energy and protect the environment, improve the quality of tunnel lighting, but also in order to adapt to the sustainable development of tunnel operation management, combined with the tunnel lighting environment and special visual perception, it is very necessary to find a reasonable model of lighting source theory and skills.

1 Comparison of the function of the conventional tunnel light and LED tunnel lamp

The current tunnel lighting is the high-pressure sodium lamp as the light source, but in the form of radiation, high pressure sodium lamp color, visual sensitivity, power specifications, brightness control etc. there are many deficiencies, while the LED tunnel lighting lamp new for its excellent performance, especially the controllability of brightness, overcome the shortcomings of high pressure sodium lamp the world today is becoming the mainstream of the tunnel lighting lamp. The state has also issued a "Ten City million" semiconductor lighting project, a new initiative for the development of LED tunnel lights have brought unprecedented opportunities.

LED (LightEmittingDiode) is a light-emitting diode, a semiconductor light-emitting technology. The earliest developed LED can only emit red light, used in electronic equipment in the indicator light. With the development of technology, now the LED lamp has been sent to all kinds of color lights, and is widely used in many industries, mainly including the traditional display application market and signal lamp market, backlight market, street lights, tunnel lights, automotive lighting market, outdoor landscape lighting and decorative lighting, special lighting market market. As a tunnel light source, LED has its unique advantages.

(1) the LED tunnel lamp has low power consumption and energy saving. Compared with the traditional high pressure sodium lamp, the energy consumption is saved by more than 40%.

(2) LED tunnel lamp life is long, in the ideal state, there are 100 thousand h, while the high-pressure sodium lamp and fluorescent tube life is only ~3 Wan H.

(3) the LED tunnel lamp has high reliability, low maintenance and maintenance costs, and the average time to failure (MTBF) is as high as 20 thousand h, while the average failure time (MTBF) of high pressure sodium lamps and fluorescent tubes is less than 10 thousand H.

(4) reduce the distribution system (cable, transformer, distribution box, bridge construction cost, etc.) for the long tunnel, long distance power supply, cable, distribution facilities accounted for the proportion of the cost especially large, using LED tunnel lamp because electricity can greatly reduce the cable and power distribution equipment investment.

(5) LED tunnel lamp can achieve instant start, easy to adjust the brightness, with no flicker, start a wide voltage range, can achieve a variety of ways such as, according to the traffic flow, intelligent road tunnel illumination control etc..

(6) high pressure sodium lamp, fluorescent lamp, electrodeless lamp contain mercury, lead and other chemical pollutants, and LED tunnel light source does not contain chemical pollutants, is a green environmental protection light source.

Design requirements of 2 high power LED tunnel lamp

(1) the basic lighting shall be provided in the daytime or at night. When the vehicle enters the tunnel during the day, the road surface brightness should be gradually decreased, so that the driver's vision has an adaptive process.

(2) introduction section, to determine the section and transition section length (S), usually according to the vehicle speed (V) determined by T=2s adaptation time, S=VT/3.6m can be used to estimate; exit section should also transition lighting, in two-way traffic conditions and the same entrance.

(3) the night entrance is not set up to strengthen the lighting, street lighting should be set out, not less than the basic brightness brightness of 1/2; the tunnel should be equipped with emergency lighting, its brightness is not less than the basic brightness 1/10.

(4) according to the provisions of the design code for highway tunnel in China JTJ026-90, the length of the tunnel entrance lighting area and the minimum brightness of the pavement are designed according to the requirements of table 1.

Design scheme of 3 power LED tunnel lamp

Selection of 3.1LED light source

Watt LED single lumen output is the basic index, determine whether the LED tunnel lamp has practical value in accordance with the requirements of the number of single tile lumen LED used LED tunnel lights should reach more than 80 lumens, in the rapid development of nearly three years after the luminous efficiency of the LED, LED light effect at this stage can be reached in large quantity more than 90lm/W, and constantly improve the brightness. Table 2 provides the main technical parameters of the mass production of high power 1W white LED on behalf of the international forefront of several major manufacturers. OSRAM can be used for the design of LUWW5AM light source manufacturers, the use of LED light source has the characteristics of a variety of different color temperature can be selected, select the LED light source with similar fluorescent color temperature 4000~6000K, can effectively reduce the "light hole" and "black hole" effect.

3.2 light distribution design

According to the requirements of tunnel lighting, lighting in different periods with different light lamps, based on optical principle and LED light source with high directivity characteristics, the light distribution reasonable, in order to meet the requirements of the luminance or illuminance, reduce the lamp power, achieve the purpose of energy saving.

(1) the introduction of the import section, the tunnel section to section and transition section and exit section of the asymmetric distribution of light illumination (light lighting), illumination in the same conditions, compared with ordinary lighting, can improve the surface brightness of 121%, at the same time, with the advantages of high directivity, the intensity of strict control of large angle direction the elimination of most glare.

(2) in the basic section of the tunnel, the common distribution pattern of light distribution is concentrated light distribution, side projection type light distribution, Lambert type light distribution, etc.. Not suitable for different applications