DIY light ideas
Below are some ideas for some Do It Yourself lights. No, these are probably not what you should build for your bid at the solo 24hr Championships, nor will they fare well when stacked up against $400+ HID units. But these are hell-of-cheap and fun to build, and can give you something to go niteriding with when you got squat.
Go to MTBR and spend some time searching the archives for DIY lights. There is a wealth of info there with pictures, sources, etc.
Go to these links:
Tony Reynolds lights
Lowes, Home Despot, lighting store, online, whatever. DC voltage track lighting is a good place to start
Plumbing section of hardware store
Scavange an old Vista Light setup and adapt it, or use two hose clamps set up perpendicular to each other. One goes around your bar and one goes around your light.
Other sources of fun stuff
This is where I got this Red Xenon strobe that I made a tail light out of.