I am building up a winter bike. The front wheel will have a Sturmey-Archer X-FDD (dynamo Drum) hub. It produces 6v, 3w. I am looking for a headlamp. I was going to build an LED light using the diagrams at pilom.com for help, but I was helping at the bike recycler last night, and they had a VistaLite 5W halogen headlamp that showed up in a box of odds and ends. It had no battery pack with it, so I tried it with 6v from some AA batteries, and it lit right up.
I believe halogens will work on either AC or DC, so am I right in thinking this lamp will work fine when driven by a dynohub? Any problems to be aware of?
At worst, I'm only out a buck, and I thought I could always rebuild it with an LED, so no worries if it doesn't work.