Most of the conversions give you somewhat higher output in watts, but there are limits to what can be safely delivered from a given dynamo.
But it comes down to draw vs. dynamo output. The 6V 60-watt Lucas E3L was adequate as originally fitted to a Black Prince with a 24W headlamp, so it should be fine if you switch to a 10W LED bulb. Of course if you plan to add turn signals or other accessories, youpower.may need more p
Many thanks to all. This should help.me set direction.