The XL 150 installation housing is used for installing LEDs, low-voltage halogen, energy-saving lamps, metal halide lamps and compact fluorescent lamps. If an 85 mm round installation opening is required, we recommend using the front part with a fixed installation opening. The opening is opened with a hammer after the concrete has been poured. In order to enable individual drill hole openings for different lamp types or lamp bases, a front part with mineral fiber board is available for the installation housing. After the concrete has been poured, the alignment line can be perfectly maintained by means of targeted drilling.