Approaching a turn or downhill I would pull the dynamo on. The system worked brilliantly. The Union headlight is superior to the Lumotec and I would have used two of them had two fitted on the trike's derailleur post. The Lumotec lamp was designed so that the bulb could be instantly changed without tools though which is an advantage. I used two 5 LED red rear lights.
Duplication is good.
Luckily that and one flat-tyre from the valve hole slicing the valve stem were the only problems I had in total. The ride so far hadn't really seemed all that hilly - certainly less so than I was lead to believe. My legs were having no trouble with them anyway. There was also much interest in the Greenspeed at the controls and en route. Maybe, if there's a next time, I'll be able to speak a little more French and answer ALL the questions I was unable to this time round.