856 = All versions starts with these numbers followed by:
1 = 6 Volt
2 = 12 Volt
3 = 24 Volt
.1 = First version permanent mount
.2 = First version DDR pipe mount
.5 = Second version permanent mount
.6 = Second version DDR pipe mount
(.3 and .4 are not in any of my FER catalogues)
Without a / = Blue
/1 = Red
/2 = Amber
/3 = Green
/42 = Blue DIN pipe mount
/52 = Red DIN pipe mount
/62 = Amber DIN pipe mount
/72 = Green DIN pipe mount
Examples:
8562.1 = Blue 12 Volt First version.
8562.5 = Blue 12 Volt Second version.
8563.1/2 = Amber 24 Volt First version.
8561.1/1 = Red 6 Volt First version.
8563.2/2 = Amber 24 Volt DDR pipe mount First version.
8562.6/1 = Red 12 Volt Second version DDR pipe mount.
8562.6/42 = Blue 12 Volt DIN pipe mount.
I think you will get hang on it.
There are many German sites on the Internet that says that the blue light’s number is 8563.1 in 12 Volt but that is wrong.
All these numbers are from several original catalogues and brochures that I have.
Michael