Like others in this forum I decided to modify Rovio so that it could be used in the dark. The additional headlights are Maglite 4 cell 3 watt LED modules for a total of 6 watts. They turn on automatically when the original headlight turns on. Did not realize how dirty Rovio had gotten until taking these pictures. This mod adds plenty of light to navigate Rovio in total darkness. Got the LED modules from WalMart and the rest of the parts from Radio Shack. The Radio Shack part numbers are on the schematic.
The Maglite 4 cell 3 watt LED modules are pretty cool because they have a built in DC to DC converter to keep the voltage and current at the optimum values for the LEDs.
What it looks like: