Was leisten Lichtschutzsysteme in der Praxis?

What do light protection systems achieve in practice? Different approaches and results in long-term tests In many monuments and museums, it has been observed in recent years that during construction work on which the windows are being refurbished or renewed, the issue of improved "contemporary" light protection is also assigned an important role. This improvement is increasingly being placed directly in the glass plane. Depending on the requirements, defined portions of the UV and / or IR radiation of the sunlight are reduced. From an architectural point of view, these functional glasses and films are a wonderful way to provide a certain level of light protection while virtually eliminating the need for other light control systems. The visitor can once again look outside without hindrance. This sounds very tempting for planners, architects and users: communication between the museum space and the outside world and yet protection from harmful light components.Is this really the case? Various investigations in objects with such functional glasses show that a certain proportion of harmful light components is still present. Shouldn't one therefore fall back on the tried and tested historical light protection systems? In this publication, current measurements from Saxony are presented and thoughts on how to proceed further are derived.