(Hangzhou Hao Technology Co., Ltd. Li Hao Wang Zhenglin Xu Qi)
First, the background:
1. The country's 4 trillion yuan investment in railways, highways, airports, urban and rural power grids 1.80 billion yuan, accounting for 45%;
2. The promotion targets of 21 “Ten Cities and Ten Thousand Cities†pilot cities approved by the Ministry of Science and Technology are: By 2009, in the approved pilot cities (towns), more than 1 million LED municipal lighting fixtures will be applied, and the proportion of localized LED devices will be 60%. It is expected to save 220 million kWh annually. Focus on supporting road lighting, tunnel lighting, subway cars and platforms, underground parking lots, gas station lighting, indoor lighting and other products demonstration applications; by 2010, the completion of 50 semiconductor lighting application demonstration city construction work nationwide, the application of LED 2 million municipal lighting fixtures, more than 70% of LED devices localization, included in the Ministry of Finance "green lighting project", is expected to save 1 billion kWh annually; by 2015, semiconductor lighting enters 30% of the general lighting market, expected year With a power saving of 140 billion kWh, the semiconductor lighting industry will reach 500 billion yuan, export 30 billion US dollars, create more than 1 million jobs, and become the world's semiconductor lighting industry top three.
3. The state strongly advocates the innovative application of new technologies and new products such as energy conservation and emission reduction and green lighting;
4, high-power LED as the third-generation lighting revolution, the industry's own technology and innovative applications have been rapidly developed, its inherent characteristics are better than other traditional light sources
5. The best choice for the tunnel operation management department (owner) to cope with tunnel safety and lighting power saving
6, the need for technology and product replacement
With a series of good news will promote a new round of rapid development of China's economy, and semiconductor lighting, an emerging industry with high efficiency, energy saving, environmental protection, long life and intelligence, will enter a best development. Timing, and can drive the rapid development of related industries, especially the application of various types of outdoor lighting will be rapidly developed, and the innovative LED application of various tunnel lighting has gradually entered the mature application stage.
Second, the necessity of applying new light source in tunnel lighting
As a general-purpose tunnel illumination source, high-pressure sodium lamps have the following characteristics:
1. The color of the high-pressure sodium lamp is yellow, and the color temperature and the imaging index are low. The color rendering index of the sun is 100, while the color rendering index of the high-pressure sodium lamp is only about 25, and the appearance of the object is difficult to present.
2. The structure of the sodium lamp bulb determines that the light source utilization rate of the lamp is low, about 60%. The angle of illumination of the tube is 360°, and most of the light must be reflected by the reflector to reach the designated area.
3, high pressure sodium lamp bulb start-up time is long, need to have a certain time interval when starting again. The high-pressure sodium lamp can reach normal brightness after being energized for about 5 to 10 minutes, and the time interval for restarting is generally greater than 5 minutes.
4. The temperature of the sodium lamp is very different when the lamp is on and the lamp is off. If the lamp body does not have a respiratory system, the reflector is easily corroded by harmful gases and generates a large loss of light.
5, the technology is very mature, the application is very extensive, the power can be done relatively high, the price is relatively low, and the service life is about 20,000 hours.
The electrodeless lamp is used as a tunnel illumination source and its characteristics are:
1. Long life, no filament and electrode in the lamp, the life of the bulb depends only on the natural attenuation of the phosphor, and the design life index is ≥40,000 hours.
2, the current light effect is about 80lm/w, showing an index of about 75.
3, large radiation, obvious electromagnetic interference, no flicker, no sputtering, low glare.
4, instant start, start time ≤ 0.1 seconds, no preheating, instant lighting can be activated.
5, good electrical performance, power factor ≥ 0.95, small current harmonics;
6, extended function, can achieve DC power supply, timing break and other personality features.
7, low light temperature, low light efficiency, poor color rendering.
8, power limit, currently only 400W, the price is relatively cheap, is widely regarded by the industry as a transitional light source, not an alternative light source.
The main features of high-power LED light source for tunnel lighting are:
1, long life, theoretical life of 100,000 hours, the actual life of ≥ 50,000 hours.
2, the current single-watt light effect 90 ~ 130lm, integrated single 10W light effect ≥ 900lm, the display index ≥ 75.
3, no radiation, no electromagnetic interference, no flicker, no sputtering, low glare.
4, instant start, start time ≤ 0.01 seconds, no need to preheat, instant lighting can be activated.
5, good electrical performance, power factor ≥ 0.95, the whole lamp efficiency ≥ 90%, current harmonics are small.
6, the extension function is strong, can achieve intelligent stepless dimming, security warning and other auxiliary functions.
7, high heat dissipation requirements, relatively expensive, is considered by the industry as an alternative source of light, is the third generation of lighting revolution after incandescent lamps, fluorescent lamps.
Schematic diagram of light attenuation curves of three kinds of light sources
From the comparison results, it can be concluded that the LED light source is not only feasible for tunnel lighting, but also can improve the effect of tunnel lighting and the reduction of operating costs.