SPARK just finished one tunnel light project of changing high pressure sodium lamp to LED tunnel lights in Central Americas. From the selection of led lamps to the lighting simulation, SPARK provided customer one satisfactory solution.
 

1. Design: Not like general road lighting, tunnel lighting, with distinct specificity and importance, play vital role for safety traffic in tunnels. When design tunnel lighting, SPARK fully consider people’s eyes brightness adaption and darkness adaption factors, emphasis on transitional space and transitional lighting.

1.1 To meet people’s eyes’ adaption requirements, tunnel lighting area are divided into five sections, entrance section,
transition section I, transition section II, basic section and exit section. Each plays roles as following:

① Entrance section: to eliminate “black hole” phenomenon, drivers can identify obstacles at the entrance;
② Transition section I: after entering the tunnel, drivers can adapt quickly;
③ Transition section II: drivers adapt to the lighting inside tunnels;
④ Basic section: basic lighting inside tunnels;
⑤ Exist section: At day time, drivers can adapt to the glare of exist, eliminating “bright hole”; At night, drivers can see external road linear and obstacles on road, also eliminating “black hole” phenomenon.

1.2 Lighting luminance

1.3  DIALUX simulation ( for entrance section, for reference only):
 

2. Selection of LED lamps: use SPARK SPT-125, 125w LED tunnel light, adopt original CREE LEDs, good heat dissipation effect, zero light decay after 6000 hrs lighting.

3. Lighting effect comparison:

With high pressure sodium lamp, lighting effect very bad, traffic accidents occur frequently.

After replacement, using LED lamps.