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LED Components from Tridonic Improve Visibility and Safety in the Schallberg Tunnel

Schallberg tunnelFollowing extensive renovation work, the Schallberg tunnel on the Simplon Pass is now a much brighter and safer place thanks to LED components from Tridonic.

The 45 km long Simplon Pass between Brig and Iselle is one of the most important transit routes in the Swiss Alps is used by an average of about 2,500 vehicles every day.

Renovation of the 500 m long Schallberg tunnel at the start of the pass not far from Brig could not be delayed any longer in view of its advanced age. “This was a complete renovation job, involving all the tunnel elements. Among other things, we repaired the two galleries, built a new escape tunnel, lowered the road in some places to provide adequate clearance for trucks, and put down a new road surface”, said Mark Siegenthaler from ASTRA, the Swiss Federal Roads Office. Also renewed were the operational and safety equipment, the ventilation system, the power supply, the control system and the lighting. All these were once state of the art, of course, but that was back in the 1970s.

A total of 100 transition zone luminaires and 150 interior zone luminaires from Swiss tunnel lighting specialist Rigamonti in combination with the white reflective tunnel walls create a pleasant atmosphere. The “inner workings” of the luminaires along with the emergency wall lights, escape route lights, escape route indicators and escape exit signs are all equipped with LED components from Tridonic.

The transition zone luminaires in the entrance and exit zones feature new LED modules based on the high-efficiency RLE series and developed specifically for tunnel lighting in accordance with specifications supplied by Rigamonti. The entrances to and exits from tunnels are high-risk areas for accidents because the lighting conditions change so abruptly. The risk can be reduced, however, with the right artificial lighting.

Each of the transition zone luminaires contains two LED modules. They are supplied with an operating current of 350 mA, have a power draw of 112 W and generate a luminous flux of 18,350 lm. Only the last three luminaires in the transition zone are equipped with only one LED module, providing a gentle transition to the interior zone. A striking feature of the luminaire housing is its low-profile design, made possible by LED technology. The luminaires are 1,550 mm long and 170 mm wide but only 40 mm deep.

For lighting in the interior zone new customised LED modules were developed on the basis of LLE modules, with five being accommodated in each luminaire. At an operating current of 300 mA the interior zone luminaires need 38.25 W and provide 6,365 lm. With an emission angle of 120 degrees and a light colour of 6,500 K, they and the transition zone luminaires together generate the recommended average carriageway luminances of 45 cd/m2 in the entrance zone and 3 cd/m2 in the interior of the tunnel, providing a comfortable, safe and energy-efficient lighting solution for the Schallberg tunnel.

Drivers from Tridonic’s PREMIUM series ensure optimum operating conditions for the LEDs. The 1-100 percent dimmable constant-current LED Drivers feature adjustable output currents and have integrated over temperature, short-circuit and overload protection.

The one4all interface provides superior dimming performance via DALI, DSI, switchDIM and corridorFUNCTION and also has the ready2mains digital interface. While the transition zone luminaires have one driver per LED board, the tunnel interior luminaires only need one driver per luminaire.

The new LED solution from Rigamonti for the Schallberg tunnel is a high-performance lighting system that offers a high level of visual comfort and has a positive effect on the sense of safety among vehicle drivers. The system ensures compliance with the current standards of the Swiss Engineers and Architects Association (SIA) and will lead to a noticeable reduction in energy consumption and maintenance costs. For example, the LED inserts can be replaced without the need for any tools. Long life is another benefit. Tridonic specifies a life of up to 100,000 hours for the components. This translates into eleven and a half years of continuous operation for the interior zone luminaires.

The Schallberg tunnel with its new lighting is now bright and inviting and offers excellent visibility for a safer driving experience.

Tags: Tridonic, Lighting Management, lighting industry news, e-lec.org

Project Information:

•    LED lighting for the Schallberg tunnel, A9 Simplon, Switzerland
•    Contractor: Swiss Federal Roads Office ASTRA
•    Lighting planning/lighting concept: Rigamonti, Contone/Locarno, Switzerland
•    Electrical installation: Stromag, Brig/Glis, Switzerland
•    LED components: Tridonic, Dornbirn, Austria