G'day BadgerJohn,
I've been using dynamo hubs for about 20 years I guess.
I started with a front Sturmey Archer GH6.
The headlight options in those days were very limited and were really just to be seen by other road users as opposed to seeing anything by.
I now use a Son28 front dynamo hub with an Edelux 1 headlight and utilise a Philips Lumiring tail-light.
My hub also charges my Garmin Edge 800 gps and my cell phone.
It does this via an E-werk with a cache battery.

http://swhs.home.xs4all.nl/fiets/tes.../index_en.html

http://www.peterwhitecycles.com/schmidt-headlights.asp

http://www.peterwhitecycles.com/schmidt.asp

http://www.peterwhitecycles.com/ewerk.asp

http://cyclingtips.com.au/2012/09/ga...00-gps-review/

http://cyclingabout.com/index.php/20...cycle-touring/