Idec led module for signalight towers ld6a series idec ld9z 6alw s the idec ld9z 6alw s ld6a is a blue led module for the signalight towers from the ld6a series this led module was specifically created with a modern design and unique lens shape which diffuses light to provide sharper illumination and increased visibility it utilises the latest led technology to provide a bright solution for supervising workstations or indicating the status of a process the modules oval shape with stripe