The SOLA IC downlights make it easier to comply with building regulations. For example, installation is even possible in a ceiling that requires a fire protection of 90 minutes. They also improve the acoustic properties of ceiling constructions by reducing air permeability. Another unusual feature is that these downlights can be installed directly below mineral-fibre insulating material. These improvements and the large selection of energy-saving LEDs and compact fluorescent lamps that can be fitted give the design of these recessed spots their distinctive character.