Werma signaltechnik 644 450 55 led multicolour signal light werma signaltechnik 644 450 55 p the werma signaltechnik 644 450 55 is an led multicolour signal light that offers countless combinations of optical and acoustic possibilities of the modular composition of the product the signal lamp is able to produce seven different colours these are triggered via the pins in the terminal element p p modular signal towers provide an important visual signal for example a change in status of