Thanks to high product quality and excellent luminous flux maintenance, ERCO luminaires provide a high level of investment security. There is an indication that also reflects the quality of luminaires in figures: the L90/B10 value. It specified the assured behaviour of a luminaire in the first 50,000 hours of its service life. At 9 hours of daily operation over 15 years, this means excellent photometric properties. The luminaire is fully functional even after this time. Please note that you may then have to consider the brightness level of the luminaires separately in your lighting calculations.