From the XKCD online comic, which is not usually interactive, I found this interesting concept for a light-control gizmo:
http://xkcd.com/1663/
Grab the small red pointer and drag it around with the mouse. You can control rotation and spread with a single pointer motion. Dragging the light source moves the whole assembly.
Dragging the circle around the ring changes the hue of the light. I could envision an in-out movement of that same circle as an intensity modifier, if someone...
Interesting UI concept found in the wild
http://xkcd.com/1663/
Grab the small red pointer and drag it around with the mouse. You can control rotation and spread with a single pointer motion. Dragging the light source moves the whole assembly.
Dragging the circle around the ring changes the hue of the light. I could envision an in-out movement of that same circle as an intensity modifier, if someone...
Interesting UI concept found in the wild