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the difference between a 110v circuit and 220v circuit is determined by the way the brakers in the main box attach to the main busses.
coming into the house are 3 main wires that terminate in the 3 main bussses in the main braker box, 1 is ground and the other 2 are 110-120v wrt the ground but 220v wrt to each other because the AC current is out of phase.
a 110-120v circuit is formed when a breaker bridges a hot buss and ground. A 220v circuit is formed when the breaker bridges the 2 hot busses. The breakers do this automaticly when the are installed.
the wire doesn't care about voltage it only cares about amperage.
So the unused range wire will have plenty of amperage capacity for your lights and can be made into a 110v circuit by just replacing the 220v circuit breaker w/ a 110v breaker and moving the white wire that was connected to a hot on the 220v breaker to the ground buss.
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