Originally Posted by
MichaelW
You can't repair a puncture by dynamo light, you need an auxilliary battery lamp. I carry a small LED watch battery backup.
The new Luxos U is an exception -- its standlight stays on for 10+ minutes, and is easily bright enough for changing a flat. It has a much brighter standlight than most on the market, using an actual battery instead of a supercapacitor.