Ya might want to start here:
http://trailtech.net/lights.html
And if you are really serious:
http://www.touratech-usa.com/
I know some people that swear
by a single helmet light. They
do not ride fast open stuff, but,
tight single track and putting
around camp and to the outhouse.
They set up a connector like a headphone
jack with a coiled up strechie cord like on a
phone. Wire it into the bikes electrical
system with the plug up between the bars.
And mount the light on their helmet with
hi-strength velcro. If they fall the cord
detaches at the headphone jack so they
don't get choked by the wire.
I have been wanting one of these for some time:
http://trailtech.net/helmet_light_kits.html
I have an '02 XC300 converted to an EC300. Like you
I installed the 2K3 ingition. I also did the DC conversion
and added a sealed lead acid battery with a rectifier.
It now powers all the lights, signals and horn without
having the motor running. I may get one of the bar
mount halogen units one of these days.
Kind of like this one:
http://www.trailtech.net/3152-FX.html
Let us know what you come up with.
Good luck. Jeff So. Cal.