Lights
The Grin Tech ebike lights are designed explicitly for use on electric bicycles. They will operate efficiently with anywhere from 15V to 100V on the input. Not only can they be directly connected to your battery pack, they'll continue to work fine even if you upgrade or change your battery voltage in the future. All lights are available with 5.5x2.1mm DC input jack so they can be powered directly from a Cycle Analyst (V2.3 or newer) but some custom wiring options are available as well.
For more information, see:
Cycle Lumenator Page (now discontinued) and the
Electrolights Info Page.