Efficacy is achieved by irradiation of the cone of light of the surfaces. Normally a cone of light radiated by an LED bulb placed at a standard height (2.80-3.00m) covers an area of ​about 8/10 sqm. Therefore, for the effective coverage of a 20 m2 room it is recommended to install at least 2 BIOVITAE Domus, at a distance of 1.5 m from each other.