The returns from supplemental lighting installations decrease over time. How fast this happens depends on various factors. The light output from lamps decreases as does reflector efficiency. Decreased returns such as this often remain hidden because they generally cannot be observed with the naked eye. Raymax can measure the decreased returns objectively based on various light measurements. Raymax has its own metering laboratory available for this purpose that has an Ulbricht Sphere, for measuring lamps, and a Goniomobiel, which is a mobile unit for measuring reflectors. Raymax offers the option of having these measurements taken annually so that you are up to date regarding the efficiency of your supplemental lighting installation. They offer a Supplemental Lighting Contract (SLC) (Groeilichtcontract (GLC)), for this purpose, which takes the responsibility for optimum performance of the supplemental lighting installation of your shoulders.