The XL 300 Flex concrete installation housing with transformer is used for the installation of LEDs, low-voltage halogen, energy-saving lamps, metal halide lamps and compact fluorescent lamps. The luminaire installation housing enables tool-free and absolutely concrete-tight pipe insertion for pipe sizes M20 and M25 using the Primo membrane technology. The installation housings are nailed to the formwork on the construction site. For maximum flexibility, the Primo boxes can be provided with individual installation openings on customer request, which are simply knocked out on the construction site. The transformer tunnel offers additional space for additional electronic components. The box is closed with a metal plate for increased stability and optimal heat dissipation. In addition, the metal plate offers maximum resistance to impact.