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LED Tunnel Light Housing Advantages And Installation Considerations
Sep 13, 2017

LED Tunnel lamp is a kind of tunnel, it is used in tunnels, workshops, large warehouses, stadiums, metallurgy and all kinds of plant, construction and other places large-area floodlight lighting, the most suitable for urban landscape, billboards, building facades for landscaping lighting.

Advantages of LED Tunnel light:

Led and the traditional tunnel illumination light source contrast LED is a solid-state semiconductor device, it can directly convert electricity into light, compared to traditional road tunnel lighting source (sodium, metal halide lamp, etc.), LED light source has the following advantages:

(1) Light attenuation small: If in the case of good heat dissipation conditions, led 10000h before the positive light decay, the former 10000h optical decay is 3% 10%, the former 50000h is basically 30%, far below the ordinary road lighting light source, luminous more stable.

(2) High color rendering: General LED color rendering is about 7 0~8 0, if using three phosphor phosphors higher; general high-pressure sodium lamp for 2 0~35, low pressure sodium lamp, so even though the traditional light source brightness is higher than led, but the visual effect of the LED, "not the brightest, but see the clearest" This should be LED light source application development direction.

(3) Life expectancy: Led life expectancy is higher than the general road tunnel lighting Source, is now generally higher than 50000H.

(4) Price: Although the price of LED lamp is higher than the traditional lighting, but with the maturity of manufacturing technology, the price is now in a large decline in the constant, high and low pressure sodium lamps in general a price of about 2000 yuan, and its cable and other ancillary parts price higher than led cable and other costs.

In addition, LED also has a high maintenance coefficient, good safety performance, no stroboscopic and energy-saving environmental protection advantages.

Future challenges

At present, in the tunnel lighting application of the light source, high pressure sodium lamp because of its higher visual light efficiency (can reach 120lm/w) and has been a large-scale application, but the high-pressure sodium lamp in the tunnel lighting still exist some insurmountable problems, The main color is poor and light source power selection range is limited (usually only choose 250W and 400W), especially in the interior section lighting, high-pressure sodium lamp on the one hand no small power, on the other hand, the point-like strong light source caused by glare and stroboscopic more serious. In some long tunnels, straight-tube fluorescent lamps have some applications because of their higher color rendering and linear illumination, but because of the short life of fluorescent lamp, usually only about 8,000 hours, so it often needs to be replaced, which greatly increases the maintenance cost of the tunnel. In addition, the power of the fluorescent lamp is small, in the entrance section, the Transition section and the export section, such as the need for higher illumination areas can not meet the requirements. In recent years with the maturity of electrodeless lamp technology, due to the elimination of the influence of the electrode factor, electrodeless fluorescent lamp compared to the traditional fluorescent lamp has a longer life, can also achieve greater power, which makes the electrodeless lamp in the tunnel lighting show the advantages. However, the luminous surface of electrodeless lamp is larger, and the optical efficiency of the luminaire is lower when the optical design is carried out.

Although the current large-scale application of LED tunnel lights still exist a lot of difficulties and challenges, such as LED lighting product standards are not perfect, some low-quality products on the market to promote the negative impact of LED tunnel lights first purchase costs higher. These are the LED tunnel lighting products in the large-scale application of the market pressure, but these pressures are any new technology in the early application of new products will inevitably encounter. However, with the further development of high-power white LED technology, led tunnel lighting and thermoelectric integrated system technology continues to mature, people's energy conservation and environmental awareness of the further enhancement, LED technology will be in the Tunnel Lighting application field to create a new future of the semiconductor lighting industry. Applicable environment

LED Tunnel lamp housing selection of high strength, good toughness of the alloy environmental protection materials, transparent parts for strengthening tempered glass, dustproof waterproof, corrosion-resistant rust. With strong impact resistance and shock ability, multi-channel shockproof structure and High-tech surface spraying treatment, a variety of close-range high-intensity high-frequency vibration can not affect the luminaire, and can be in the workshop, roadbed, rail and other high-frequency vibration and humid, high-temperature environment long-term stable work. Good electromagnetic compatibility, will not cause interference to the transmission network.

installation mode

LED tunnel lamp has a suction roof type, hanging rod type, seat type, wall-mounted type, such as a variety of installation methods, easier operation. Adapt to different job site lighting needs. Lighting and electrical box integration design, the overall reliability is strong, failure rate is low, the use of maintenance more safe and convenient. LED tunnel lamp can adopt intelligent control technology, realize self dimming control, save energy. LED tunnel lighting basic situation long tunnel in accordance with two-hole one-way driving mode layout lamps, tunnel lighting section, the transition 1, 2, 3, the basic section and the Export section; lighting function points to strengthen the lamp, day lights and emergency lights three kinds. Double-sided cloth lamp, lamp installation height is 5.5 meters.

The road tunnel illumination has its characteristic, it is different from the ordinary road illumination. The following points need to be considered in design:

1. Road surface should have a certain level of brightness

2. Tunnel walls should have a certain level of brightness

3. Design speed, traffic volume, route alignment and so on many factors

4. Comprehensive determination of lighting levels from the aspects of safety and comfort of vehicles

5. Human visual adaptability, especially the tunnel entrance section, exit section, etc.

6. Tunnels also need illumination during the day, and daytime lighting problems are more complex than at night.

In order to save energy, improve lighting effect and ensure the safety and comfort of driving, the following aspects can be considered in tunnel lighting:

1. Brightness

As the brightness of the tunnel outside the day is much higher than in the tunnel, so when the driver is driving into the tunnel, the vision need to have a certain adaptation time, then can see the inside of the tunnel, this phenomenon is called "adaptive lag", if there is no proper transition, it will produce black hole phenomenon, The driver temporarily loses the normal visual function, this will bring certain security risks. Black hole phenomenon is a visual problem that occurs before entering the tunnel, and also the most important problem in tunnel illumination. For this tunnel lighting is usually divided into entrance lighting, internal lighting and export lighting. The brightness of the daytime tunnel entrance illumination should be determined according to the brightness, speed, the view field of the entrance and the length of the tunnel. The threshold segment is to eliminate the phenomenon of "black hole", the illumination level of the transition section gradually decreases, thus providing the driver with the time of visual darkness adaptation.

2. Uniformity of brightness

Good visual function not only requires a good average brightness, but also requires that the average brightness and the minimum brightness between the road can not be too big difference. If the brightness difference in the field is too large, the bright part will form a glare light source, and the changes in the bright and dark will bring a certain stroboscopic effect, then affect the vision, the visual effect of human eyes will be significantly worse, and visual fatigue will be aggravated.

The overall brightness uniformity U0 refers to the ratio of the minimum brightness and the average brightness on the inner section of the tunnel, and the longitudinal evenness U1 refers to the ratio of the minimum road brightness and the maximum road brightness on the lane axis. If there is a continuous, repetitive appearance of bright belts and dark bands on the Pavement, the "zebra effect", it will be very annoying for road users who travel in this lane. The problem involves human psychology, but it also endangers road safety, and longitudinal uniformity is mainly used to evaluate the size of the zebra effect.

3. Glare

The formation of glare is due to the high brightness or brightness contrast in the field of view, which makes the visual function drop or make the eyes feel uncomfortable. The glare in tunnel lighting can come from oncoming headlights, tunnel lighting, high brightness outside the tunnel exit. Glare will reduce the ability to identify obstacles and endanger traffic safety. The tunnel illumination lamp should adopt the cut-light type, take the special technical measure of eliminating direct and reflecting glare, forming diffuse reflection, so that the light is very gentle into the human eye. The International Lighting Commission uses a relative threshold increment (TI) to illustrate the decline in visual function caused by glare, or the measurement of loss glare. In the tunnel lighting standard of the European Commission (CR 14380:2003E), the provision of the loss glare is as follows: The relative threshold increment (TI) must be less than 15% during daytime for the tunnel threshold and the internal segment and the entire tunnel at night.

4. Stroboscopic effect

Stroboscopic refers to the long tunnel, due to the discontinuity in the arrangement of the lighting, so that drivers are constantly stimulated by the change of light and shade to create upset. It is related to the brightness change of light and shade, the frequency of change of light and shade, and the total time of strobe. These three are related to the optical characteristics of the luminaire used, the speed of the vehicle, the distance of the lighting installation and the length of the tunnel. Generally speaking, stroboscopic frequency is less than 2.5 and greater than 15Hz is the result of the stroboscopic phenomenon is acceptable.

If the speed of the vehicle is 60km/h. 6m/s, the installation space of the luminaire is 4, so the frequency of strobe is about 4.2Hz. When designing, the appropriate lighting installation spacing should be considered. If the frequency of strobe is between 4Hz and 11Hz, and the duration of more than 20s, the driver will bring obvious discomfort.

5. Lighting Control

The advanced lighting control method is an important technique for reasonable energy saving under the condition of guaranteeing the visual condition and satisfying the requirements of tunnel illumination. The purpose of lighting control is to change the lighting level of the tunnel at any time. Because of cloudy, rainy or twilight hours, the brightness of the tunnel is much smaller than usual, so there should be appropriate measures to reduce the level of lighting in the entrance section to reduce unnecessary energy wastage. In the tunnel lighting can be based on the day, night and the size of the traffic flow factors, through a variety of dimming equipment or control devices to the tunnel lighting environment illumination or lamp opening, closing to adjust and control. At present, most of the foreign use of photosensitive devices, adjustable photoelectron rectifier and other components of intelligent lighting system, so that the overall brightness of the tunnel lamps weakened, energy consumption reduced, while ensuring that the brightness uniformity of the tunnel unchanged.