Case study

Tunnel Trettnig

Tunnel LED lighting

Project data


Tunnel Trettnig


Klagenfurt, Austria


Public lighting, Tunnel lighting

Year of completion



As part of the tunnel lighting project, designed based on the principle of circular economy, we worked on the lighting of the Trettnig tunnel, on the A2 highway in Austria. At the same time, the investor, the company that hired us, was ASFINAG, and the contractor was K.E.M. MONTAGE GMBH.


For a long time, ASFINAG company has been looking for a collaborator, which could enable it to keep its long-lasting housings during the reconstruction of tunnel lighting and at the same time replace sodium light sources with LED technology.

BUCK company accepted this challenge, and the Trettnig Tunnel was a real test for the realization of such an approach.
The project task required that one type of luminaire housing is used for lighting in the complete tunnel tube, and that, in relation to the tunnel zone, the lighting be of adequate intensity and uniformity.

Tunnel lighting projects are complex because they include a handful of technical and safety parameters, which must be carried out. The client’s request this time is that the solution is in accordance with the principles of the circular economy. The application of this model implies careful design of solutions for the production and use of luminaires, without wasting resources. It has not been replaced complete luminaire, but only necessary parts of it. Minimizing waste to protect the environment is the backbone of this approach.


The first part of the project involved the installation of LED lighting in the internal (transit) zone, on the existing electrical installation of the tunnel. Existing light sources, 300W sodium pressure have been replaced by 137W LED sources. The system that required consumption of 18.2kW in 100% mode (for both pipes – both directions), was replaced by a system of total consumption of 7.4kW. Has been designed an innovative way of replacing the inner part of the luminaire, too, with the help of “click,” for installation and maintenance without tools.

The second part of the project was a larger and more demanding undertaking. It is connected to the entrance (adaptation) zone of the tunnel, where is necessary high intensity of lighting. Instead of 400W low-pressure sodium, 234W LED light source technology is built into existing luminaire housings. This solution reduced the total electrical energy consumption from 28.4kW to 16.5kW. Typology of BUCK products used in the project: INSERT ASF 14 ASY, INSERT ASF 2 ASY for the entrance zone, and INSERT ASF 4 SYM for the inner zone.

The Trettning tunnel is the first project where, in addition to the new LED fillings, one type of ASFINAG housing has been applied for all tunnel zones. BUCK became the first manufacturer in Austria, which enabled the realization of tunnel lighting according to the principles of circular economy.

Based on the experience in this project, BUCK offers the market a luminaire for new tunnel objects on the principles of circular economy:

The circular economy is a new model of production and consumption that ensures sustainable growth over time. With this model, we start resource optimization, reduce raw material consumption and introduce recycled raw materials for reuse. The application of this model in the lighting industry implies the production and use of serviceable lamps (with easy installation), with the use of the most efficient light modules and optical accessories, with carefully designed service solutions without wasting resources. Easy interchangeability of the lamp module on-site, fully meets the requirements of the circular economy. The complete lamp is not replaced, but the necessary parts are serviced. In that way, we get a product whose lifespan is up to twenty years. Waste minimization is the backbone of this approach.

ASFINAG has been looking for a long time for an associate who would allow him to keep his long-lasting housings and at the same time replace sodium lamps with LED technology. The task was to design the concept of LED lighting for the existing dimension of the housing with quick installation, and of course, satisfying the lighting requirements of the tunnel itself. Knowing that they want to keep the existing solution, we devised the concept of LED lighting, which managed to meet the requirements of investors according to all parameters.

Tunnel lighting projects are complex in themselves because they involve a handful of parameters, both technical and safety, that must be met. During the work on this project, the client’s request was raised to a higher level because the lamps were made entirely according to the circular economy model.

Advantages of using VISION ASF luminaires

VISION ASF is a luminaire designed with the ability to open and give easy access to components for quick installation and servicing. The housing has a cover with four adjustable safety (quick release) shutters made of stainless steel. It contains an indicator luminaire visible from the outside, which enables fast and precise localization of a malfunction without opening it.

Realized advantages on the project

Our LED lighting solution has responded to all customer requirements and achieved the following benefits on the project: • Improving the energy and light efficiency of installed luminaires in the tunnel • Savings in electric energy consumption at the level of the entire project - 50% Previous consumption with NaH light sources: 46.6 kW New consumption with LED technology: 23.9kW • Fast servicing of luminaires (less than 5 minutes), without the use of tools • Significantly better uniformity of tunnel lighting and thus improved traffic safety. Focused light distribution through lenses, without scattering. • • Longer life of LED luminaires (up to 100,000 h), which reduces maintenance needs • Reduction of emissions, through saving materials and energy • Location can be provided with a possibility of installation and on-site service, which reduces costs and facilitates traffic functioning

Benefits for the investor

Time and work on maintaining the tunnel lighting have been reduced to a minimum.
The circular economy applied in this project is a step further in the creation of environmentally sustainable systems, where luminaires with stable light quality can last up to 20 years. Safe, well-lit tunnels, in which electric energy and resources are rationally used, are the goal to which we will continue to be committed.
Such a successful project is just an extension of the cooperation with the company ASFINAG, which we announced in our previous case study. More about this company you can read by clicking this LINK.

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