A floodlight style fixture, used with gel (often a combination of red, green & blue, sometimes with white or amber) to mix colors on a cyclorama. Uses a "J" or asymmetrical reflector to evenly spread out the light over a cyc. Care should be taken to hang the fixture correctly so that the reflector is properly oriented.
The Runt™ by L&E
Cyc lights may be either hung from a batten at the top, or as cyc footlights or electrics ground row either on the deck or in a cyc trough.
See this thread for some interesting discussion: http://www.controlbooth.com/forums/lighting/12137-cyc-light-product-development.html. And this one: