It is the self contained 18ACR style.
Been very weird on the way home. Light was on entire journey - about 30% illuminated on start up. Sidelights on, and it went to about 60%. When I gave the windscreen a wash and wipe, went to about 80%. However, when I got to about 3000rpm, it started pulsating/flashing between 60% and 30%. and then would stop when the revs dropped.
Charging was consistent throughout journey, and didn't fluctuate when the lamp was flashing!
