This project also gave the opportunity to improve the lighting quality, changing from HID technology, and given the dimensions and geometry, using LED technology in the fixtures the light distribution was significantly improved.
The tunnel chosen was Joanet Tunnel located on the C-25 highway and, the one-way tunnel in the direction of a town call Vic. The tunnel is 1,394 m long and has 3 lanes of circulation with a total width of 10.8 m, with hard-shoulders on both sides of 0.5 m and pavements on both sides of 1 m. In addition, the tunnel fixtures are located on a single side (fast lane), mounted on a cable tray in unilateral distribution, located within the track at 1.4 m from the start of it and at 5.65 m in height. At the light level, the challenge in this tunnel was to improve the lighting conditions of the slow lane (the one furthest from the installation point of the fixtures), especially when that lane, the slow one, supports the vast majority of the traffic of heavy and large tonnage vehicles.
We decided to opt to develop the solution that concentrated on three main points: optimization of total installed power, improvement of uniformity conditions, especially in the slow lane, minimizing possible glare, and reliable, long-lasting LED technology with the ability to be integrated into the management and regulation system that the tunnel already had at that moment. Ultimately, Tungsram's solution was the winner and therefore the chosen one.