You don't need
You don't need any lights of any kind for day VFR. Lots of Piper cubs fly with out lights or even a battery, alternator or starter........ If fact you almost don't NEED an electrical system, almost.
A lot or RV's get full tilt electrical systems with all kinds of lights, not to mention a full IFR panel, when the pilot/builder fly VFR day almost exclusively. Think of all the weight, money and build time if you built a true Day VFR RV (lights and instruments). Of course today we need a radio and transponder mode C to go anywhere. Also larger high compression engines need a starter, and with low wing fuel tanks, we also need an electric fuel pump. So a no electrical system RV is not likely, but a few RV-3's have be built without electrical systems (no boost pump with firewall header tank).
Think light Steve. You can always lay the wires for future light expansion.
Cheers George