This 1,024,000 millicandela LED lamp was put together for use on a bicycle. Only cost $100 for the parts. Figuring out the power source was probably the hardest part. I'm thinking it's a good start for building a home projector—not that I've got tons of 16mm movies lying around. What would you make?
How to build a 1,024,000 mcd portable light [Instructables]