When I was an Apprentice Electrical Fitter (Air) we learned to wire up a complete imaginary aircraft lighting system - as would be typical on a WWII bomber. Not long after graduating it was my privilege to rewire the Lancaster PA474. Apart from the usual red cockpit lights and ultra-violet instrument lights, it had all the external lights as per the aircraft wiring training phase - Navigation lights, Landing lights, Formation lights and Downward identification lights (operated by a morse key on the instrument panel). There were no Anti-collision lights though.
