what you can do it take a old beatup servo appart, where you only have the curcit board/motor and that funkey thing that u can turn (box or cylinder with little spinny thing. i cant remember the name...... [:@]

anywho plug the servo into the reciever and turn that thing, as you notice the motor will spin or stop depending on where it is, set your switch (on tx) to off and turn it so the motor stops turning (its very touchy be as precice as possible)
then once the motor isnt turning ca the turny thing in place, unsolder the motor and solder your light wires where the motor used to be. when you flip the switch the lights should come on. (make sure you have + - right)