Werma signaltechnik permanent beacon steady light 219 series werma signaltechnik 21920000 the werma signaltechnik 21920000 is a green permanent beacon steady light that has been designed for tube mounting this beacon produces a visible flashing or permanent light via an electronic signal making the operator and others aware of a specific condition or is instructed to carry out a certain course of actionthe beacon is with a wide input voltage of 12 to 230v acdc it is compact in de