Rule of thumb:
I split rooms up by recept circuits. Might double up small rooms.
Put lighting on it's own so Mrs. Homeowner doesn't get caught in the dark if the sweeper and/or other device trips the breaker...
No more than 10 fixtures per 15A lighting circuit. 13 Recepts on 20A.
I don't use #14 wire, so in a pinch I'll put lighting on a 20A if 11 through 13 fixtures are more convenient in a given situation.
Any upgrades to AFCI in the houses I have wired would be a piece of cake.
