I have a K100LT.
I was wondering if I might be able to use a converter to be able to charge my laptop or possibly even run a 400W Flash which can use any AC power source from 90-260VAC?

Assuming the bike is running could I expect to be able to power this light off the bike?

Example: 150W 12DC 110V AC Power Car Inverter Converter USB Port

I charge my laptop using an inverter from the accessory port of my bike when I'm on the road. Stopped and with my feet up, of course.