Architects:   Department of Housing and Urban Development, Mainz/Wiesbaden
Client:   City of Mainz and city of Wiesbaden
Occupant:   Public
Completion:   2008
Project size:   11,400 sqm
Lighting budget:   0.2 million euros
Photos:   Werner Huthmacher


A historic bridge connects two cities

The Theodor-Heuss-Bridge was built between 1882 and 1885 as drafted by the architect Friedrich von Thiersch.
The bridge structure is illuminated by lamps of a very good colour rendering quality in order to uncover the steel structure paint's original blue-green colour composition contrasting with the red brown colour gamut of the natural stone in its nocturnal view.
The lighting design's objective was the colour-true and homogenous illumination of the pillars and the landward abutment relative to the arching beams and the steel framework, thus reflecting the edifice's day view.

For the illumination of the arcs' bottom view, luminaires were mounted at the lower neck of the bridge pillars lighting the opposing radial segment, thus fully rendering the spatial expanse of the steel arches.
Wide beam projectors bracket-mounted above the bearing construction achieve a laminar illumination of the wide bridge flanks.
Located underneath the street lighting poles, at the pillars' upper end, medium beam projectors have been installed in order to emphasize the molded current dividers. A maintenance sledge allows for uncomplicated access from the top of the bridge.
The mounting locations of the luminaires are selected in such a fashion that they remain inconspicuous during the day. All luminaires have been chosen from a projector family of a compact and timeless design.
The homogenous illumination of the landside abutment is provided by pole-mounted wide-beam projectors.

In order to avoid glare, all luminaires with a rotational symmetric light distribution are fitted with custom-made beveled glare shield tubes. The lighting design respects the elevated requirements of shipping traffic with regards to glare protection. Furthermore, the selection of lighting tools, their positioning and aiming is tailored to avoiding light pollution near the ecologically sensitive river bank of the Rhine. The bridge's consciously low luminance range supports the design intent to harmoniously integrate the structure's nocturnal view into the existing illumination of the neighbouring historical buildings on the river banks.
Consequently, this gentle orchestration of the bridge does justice to its historical setting without appearing exaggerated.


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