Originally Posted by
cyccommute
Dynamo units aren't easily transferred from bike to bike so you have to pay $200 to $300 per bike. That adds up quickly if, like me, you have many more than one bike that you use on a regular basis for commuting and riding.
Umm... not necessarily. There's no need to have the light itself fixed permanently. I have dynohubs on several bikes, but a single light with plug-in connectors for wiring and QR mount on the handlebar. The light I have is a Supernova E3, and I certainly could not justify the cost of buying one of those for each bike.