1) Select suitable lighting sources. Lumen output per Watt (also named power efficiency) is always a notion that determines the performance of LED lights, including LED tunnel lights. Theoretically, competent LED tunnel lights should have power efficiencies larger than 80lm/W. After a three-year rapid development, the majority of LED tunnel lamps that sold in the market has reached power consumption as much as 90lm/W, following by the increase of brightness. OSRAM provided more sophisticated LED lighting sources for high-power LED tunnel lights. Natural White/Cool White (4000-6000K) is more common among LED tunnel lamps, which can provide a higher CRI and less “Bright/Black Hole Effect”.
2) Light distribution design. According to the specific requirements of tunnel lighting, optical principles and the one-direction property of LEDs, different tunnel segments should apply different light fixtures (different light distributions). Once brightness and illuminance are satisfied, the reasonable consideration of light distribution can save even more energy. In the entrance section, accommodative section, transition section and exit section asymmetric illumination (backlighting mode) should be used. Under the same lighting circumstances, in comparison with traditional high pressure sodium lamps, LED tunnel lamps can increase the light intensity near the ground by 21%. Meanwhile, the high directivity can eliminate most of glare. In the middle section (basic section) of tunnels, there are several commonly used light distribution applications: light-concentrated distribution, side-emitting distribution, Lambert distribution, etc.. Light distribution varies depending on different situations. For example, road lighting should use batwing distribution, and spot light should use light-concentrated distribution. Due to the particularity of tunnel lighting, LED tunnel lights have a relatively compact arrangement. Besides, the light distribution will differ from road lighting. Generally, batwing and Lambert are commonly used, since both of them can meet the requirements of even illumination within a large area. In the same luminous flux conditions, high-power LED tunnel lights used these two light distribution can increase the light intensity near the ground about 64%.
The development and producing of high-power LED tunnel lights provide more opportunities for national railway lighting, highway lighting and tunnel lighting, having them expand the market furthermore. It not only filled the gaps of new tunnel lighting source technology, but also promoted the development of low-carbon environmental protection process.