This Harmony XVB spare protected LED bulb is supplied with 24V AC/DC and provides a steady blue light.This spare integral LED bulb is a lighting accessory for beacon and indicator bank.It provides a steady blue light thanks to its high endurance LED.It is compatible with Harmony XVD, Harmony XVP, and Harmony XVB.Its simple and modular design allows easy installation.It features high brightness for easy identification of function and operation mode, even in brightly lit environments.It also features high endurance LED lighting for less replacement and process downtimes.