Ever buy bulbs, get home, and realize they don’t fit your cords? The most common mix-up is between E17 and E12 sockets — and it’s easier to solve than you think.
What the Numbers Mean
- E12 = 12mm base (smaller, often called “candelabra”)
- E17 = 17mm base (slightly larger, called “intermediate”)
That’s it — just the width of the screw base. But the choice affects how bright your display looks, how much space it fills, and how many cords you’ll need.
E12 Sockets
Think of E12 sockets as the smaller cousins to the classic staples. They're perfect for those who are weary of the "over-Christmas" look and prefer a more humble design.
✅ Bulbs that fit:
💡 Homeowner Tip: Because E12 bulbs are smaller, they'll look more discrete when strung up on your roofline.
E17 Sockets: Bigger, Brighter, Bolder
E17 sockets handle larger bulbs, which means more light and more impact. These are the ones you’ll see outlining rooftops in bold holiday displays.
✅ Bulbs that fit:
💡 Homeowner Tip: E17 bulbs are brighter, so you can cover more space with fewer bulbs — which means fewer cords to run along your roof.
Side-by-Side Comparison
| Feature | E12 Socket | E17 Socket |
|---|---|---|
| Base Size | 12mm (candelabra) | 17mm (intermediate) |
| Bulb Types | C7, G20 | C9, G30, G50 |
| Look | Subtle twinkle, smaller scale | Bold, visible from the street |
| Best Locations | Indoor trees, railings, bushes | Rooflines, patios, big outdoor trees |
| Cost per Bulb | Slightly lower | Slightly higher, but fewer needed |
Which Should You Choose?
Whether you choose between the bigger bulbs or the smaller cousins, it comes down entirely to personal preference. Both options (E17 and E12) will look awesome on any roofline, so chat with your family about what option you want for your home.
FAQs
Q: Can I mix E12 and E17 in the same setup?
Yes, just not on the same cord. Many homeowners mix them across different areas.
Q: Which is cheaper?
E12 bulbs cost a bit less. E17 costs more per bulb but shines brighter.
Quick Takeaway
-
E12 = smaller bulbs, cozy glow, best indoors.
-
E17 = larger bulbs, bold impact, best outdoors.
Both are great — it just depends where you’re using them. With the right size, you’ll avoid frustration and get the look you want the first time.