This quick and dirty improvised iPhone flash/video light from Andreas Ã˜degÃ¥rd consists of a 3V battery and a high intensity Cree emitter. Sure, it’s just an LED flashlight with a doc connector mount, but then again it was built in under 10 minutes with electrical tape, spare parts, and a hot glue gun. The result seems to knock the socks off your run-of-the-mill super bright LED mini-array.
A similar hack that pulls power from the iPhone dock connector can be found in the book iPhone Hacks.
In the Maker Shed: