The low-power requirements of LEDs have made them a popular choice for many battery-operated devices and a number of LED-based products for video production have appeared in recent years. Commercial vendors such as LitePanels and VidLED have produced a variety of useful LED video products.
If you'd like to harness the power of LEDs in your projects and want an inexpensive alternative to commercial solutions, just whip out your soldering iron and visit the links below, introducing you to the work of LED Hacking.
DIY LED Bike Lamp
DIY LED Video Lights - The Digital Video Information Network
LEDTronics