Lurf,

So, why couldn't your electrician do this? You have a "line" wire
bringing the electricity to the switch. You have the load wire traveling
from the switch to the lights. You have a neutral returning the electricity
from the light to the ground rod. The ground wire is a second wire
connecting to the ground rod for safety reasons.
If you need a neutral (and a ground) at the switch box and lamp box the
electrician can pull new wire. So, why won't he?

Dave M.