What is the difference between C7 and C9 Christmas Bulbs C7 vs C9 Christmas Lights Difference Between Christmas Light Decorating Ideas: C7 Christmas Lights vs C9 What is the difference between C7 and C9 Christmas Bulbs C7 vs C9 Christmas light bulbs. YouTube What is the difference between C7 and C9 Christmas Bulbs What is the difference between C7 and C9 bulbs? YouTube What is the difference between C7 and C9 Christmas Bulbs C7 vs C9 Christmas light bulbs. YouTube