Built in 1969 to the plans of the architect Paul Baumgarten, the time had now come to bring the building technology of the heritage-protected Federal Constitutional Court in Karlsruhe back into line with state-of-the-art technology.


A sustainable and energy-efficient overall renovation, but the appearance of the listed building should be retained.

Lighting solution

During the refurbishment, the format and structure of the historic ceiling must be perfectly transferred to a modern chilled ceiling, and the new lighting must also be based on the existing monument protection requirements. In order to reduce operating and maintenance costs, efficient LED downlights are used instead of the previous downlights with compact fluorescent lamps.

Thanks to standardized diameters, the current LED downlights also fit into the existing ceiling cut-outs without any additional effort, in this case into the reconstruction of the ceiling system of the time.


The result is a new ceiling that combines 1960s aesthetics with the latest building technology.

Additional benefits of LED technology

compared to classic lighting with compact flourescent lamps

  • Less modernization effort and maintenance costs due to long service life

  • In addition to the standard luminous colour 3000/4000 K we also provide dynamic lighting solutions TunableWhite 2700-6500 K or WarmDim 3000-1800 K

  • Less heat dissipation into the room reduces air-conditioninig costs

  • Homogeneous ceiling appearance, no light/dark zones or visible rings on the illuminated area thanks to the integrated diffuser cap

  • Alternatively, there is a version with a reduced installation depth, these downlights are always the right choice for ceiling restrictions

  • SMART LIGHTING: Intelligent light management also saves costs

Just change

Today‘s LED downlights are more compact than downlights at the time. This can be a problem especially for renovations or listed buildings.

For this we provide state-of-the-art LED downlights that fit without extra effort into the ceiling cut-outs with 240 mm (R23) and 280 mm (R27).

Project data
Architecture: Assem Architekten, Karlsruhe
Lighting design: Carpus & Partner, Aachen
Developer: Bundesrepublik Deutschland, vertreten durch Staatliches Hochbauamt Karlsruhe
Photo: Stefan Baumann, Karlsruhe,

TENTEC ZONO Downlights

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