C9 lights are the larger of the two most traditional Christmas light bulb sizes. They have E17 threaded bases that fit into E17 sockets. This size is what is traditionally used for C9 bulbs. That means that if your cords are in great shape, you can use C9 bulbs as replacements.

What is the difference in C7 and C9 lights?

C7 bulbs are smaller than C9s. They have an E12 candelabra base, the same size as a night light bulb. … C9 bulbs are larger, over 2 inches long, and fit an E17 base. They are usually available in 7 or 10 watts for incandescent bulbs and are generally used in the same ways as a C7 bulb.

What is difference between C6 and C9 lights?

C6 lights are the smallest of the strawberry-shaped lights that many consider the “traditional Christmas bulb” shape. … C9 lights have the same traditional strawberry shape as C6 and C7, but are slightly larger than C7. C9 lights measure 1 1/4 inches in diameter and 2 1/2 inches tall.