EN170 - ultraviolet radiation

European standard EN170 specifies the scale numbers and requirements relative to the transmission factor of filters protecting against ultraviolet radiation/sources of artificial light. The protection filters specified in this standard are not suitable for looking directly at bright light sources such as high-pressure xenon arc lamps or looking directly or indirectly at electric welding arcs. In this case a welding filter must be used as specified in standard EN169 with a scale number suitable for the light source.