C series describes the shape of a light bulb that is also known as candle, candelabra or cone. It is considered a vintage, retro upside down conical shape popularly used in Christmas lighting.
![Christmas Lights Guide Logo](https://christmaslightsguide.com/wp-content/uploads/2023/01/christmas-lights-guide-logo.png)
Christmas Lights Guide
Your Guide to Christmas Lights
![Christmas Lights Guide Logo](https://christmaslightsguide.com/wp-content/uploads/2023/01/christmas-lights-guide-logo.png)
Christmas Lights Guide
Your Guide to Christmas Lights