C9 vs. C7 Christmas Lights – 3 Key Differences
N’ key physical differences between C7 and C9 bulbs There are 5 key physical differences between C7 and C9 lights: C9 vs. C7 size C9 bulbs are typically 2 ¼” in length, with varying widths depending on the manufacturer. C7 bulbs are typically 1 ½” in length, again with varying widths depending on the manufacturer. ...