The XL 250 installation housing is used for installing LEDs, low-voltage halogens, energy-saving lamps, metal halide lamps and compact fluorescent lamps. In order to enable individual drilling holes for each lamp type or lamp base, a front part with mineral fiber board is available for the installation housing. After pouring the concrete, the alignment line can be perfectly maintained by drilling holes. Front parts with a fixed installation diameter are also available as an option; these are opened with a hammer.