I ordered some highpowered led lights/lenses today.
It's roughly $64 for the lights and driver.
I'm going to go with something like this...
except I plan on housing it all inside of that bean can of mine with a piece of plexiglass capped on or something to make sure its all water tight.
I have a ton of rechargable AA's lying around the house that I was going to use for power. We'll see how it goes..