We would agree if we wanted to put each light on it's own breaker, but the combined load at the breaker is still the peak draw of 9.9 Amps so a 10Amp breaker if we are powering them both on a single breaker. We don't feel comfortable putting a 10Amp breaker on a 20 Ga. conductor, if I'm thinking correctly the wire could overheat and
burn before the 10Amp breaker with trip.