Originally Posted by Mr IGH

Forget Schimdt, totally over-priced and the vent has caused issues on some folk's bikes in extreme conditions. SP is OK but unproven. The advantage the Schimdt and SP offer over Shimano is slightly better efficiency and less reliability for higher cost. I own both the SP and a couple Shimanos, I plan to stay with Shimano on my touring/commuter wheelsets.

Supernova lights are expensive and their shaped beamed dyno light isn't really up to market standards. The B&M seems to be the best headlamp solution these days, esp since the Phillips SafeRide is no longer available in the dyno driven model

Here's a great website for dynos and dyno lighting, :
Bicycle lighting, mostly powered via dynamo, and USB power from dynamo