Mike, his wording is confusing, less than 5 volts and less than 10? There are a lot of values bellow 5 and 10 that you can get relays rated for. They're rated for a specific switching voltage not 'less than'
He doesn't want to load the originating relay, hence my suggestion of using a single transistor to drive the second relay, all that's need is a base resistor from the relay signal to the second relay, that switches his light's which can be any voltage. Just value the base resistor to allow the transistor to saturate at the rated load required for the second relay, or don't even bother with the second relay and just use a transistor that is rated for the load of the lights.