Does anyone manage to get them working satisfactorily? I have a Schmidt dynamo hub on my Brompton. It's brilliant at throwing out light from the front lamp when it's moving, but I can never get it to light up the rear lamp properly. I tried several different lamps, the latest being a Busch & Muller D Toplight with a battery backup. I've given up trying to get a front lamp that stays on when stationary at traffic lights, but I wanted the rear lamp to stay on. Instead all I get is the rear lamp flickering on and off fairly randomly unless I switch it to battery mode, which is defeating the point.