On a Brompton L-type, the light could be partially hidden (for distant viewers) by the mudguard - it needs to have the emitter high enough up to peek over the top, so I fitted a Spanninga Arcus 180 (with LED at the top) rather than the official Brompton (Spanninga Eclipse) lamp:
My dynamo Arcuss' were/are OK (apart from each standlight cap needing resoldered) but I may have discovered why Brompton didn't choose the (Battery) Arcus as the official lamp:
my L's battery Arcus fractured around the backplate: the plastic was too thin to cope with the weight of 2AA cells:
a spare backplate and some reinforcing shall be needed.....
