Do a google search on MR16 Bike light. there are many different homemade ones on line. I made mine with a 20 watt MR16 bulb built into a 11/4 PVC fitting that works great, but it took a lot of battery, I have since changed it to a LED style mr16 bulb and I actually get some battery life. I bought a battery for it online for about 25 bucks, 12 volt 10 amp hour I believe. If you want a lot of light but don't want to spend too much, homemade is the way to go.