The XL 300 concrete installation housing without a transformer is used for installing LEDs, low-voltage halogen, energy-saving lamps, metal halide lamps and compact fluorescent lamps. The luminaire installation housing with a diameter of 300 mm enables tool-free and absolutely concrete-tight pipe insertion for pipe sizes M20 and M25 using the Primo membrane technology. In the precast concrete plant or on the construction site, the covers of the installation housing are glued or nailed to the formwork. The use of a cover with a mineral fiber board enables individual drill hole openings so that the alignment line is perfectly maintained even after the concrete has been poured. 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.