i use a program based on labor units (labor cost per item installed) and material costs but then that doesn't always work. what i have found effective is to make sure i get at least $35/hour labor plus all the materials costs. this rate is equivelent to approx. $30 to $35 per drop (220v=2 drops) plus $350 for service or about $2/ sqft. it sounds as though most folks are close. you must be carefull on custom homes. i'm doing one now that requires 70 can lights (recessed)and a dozen of them are 20 feet off the ground.
good luck, ken m
