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Frequently Asked Questions About C7 and C9 Bulbs


What are the main differences between C7 and C9 Christmas light bulbs?

The main differences are size and wattage.

C7 Bulbs     
~1.5” Long (Smaller)
.75” Wide
E12 Candelabra Base 
5 Watts                

     C9 Bulbs
>2” Long (Larger)
1.25” Wide 
E17 Intermediate Base
7 or 10 Watts

Are C7 and C9 light bulbs available in LED?

Yes, they are and use 90% less energy than their incandescent counterparts. Even better is that you can plug them into incandescent light strings.

The smaller C7 LED bulb has 3 LEDs per base, while the larger C9 has 5

c9 Christmas Light Bulb


c7 Christmas Light Bulb


Pro tip: Since LED C7 and C9s burn brighter, they give off more light using fewer bulbs.

Can you plug LED C7 and C9 bulbs into an incandescent light string?

The short answer is yes. But if you place C7 and C9 LED replacements bulbs next to incandescent bulbs, the light string’s colors will glow differently and will appear “off.”

You cannot substitute LED mini lights on an incandescent light string because LEDs require a much lower wattage than incandescent mini lights.

Do C7 and C9 bulbs get hot with use?

The older, incandescent bulbs do get hot, which makes them a fire hazard when used on or near flammable or delicate holiday decorations. However, the LED C7 and C9 bulbs do not get hot to the touch, expanding the creative horizons of where they can be used—anywhere… which leads us to…

Where should C7 and C9 light bulbs be used?

Most commonly, C7 and C9 light strings are used for exterior applications, such as lining drives and buildings, as well as stringing across structures. In other words, any place where you want to make a bright statement.

Pro tip: Order dimmable bulbs if you’re using them in an animated light show.

Do you have any tips for using C7 bulbs for decorating?

The smaller C7 is often associated with luxury residential exterior décor. These bulbs not only work well for holiday applications, but also for year-round decoration of exterior features, such as structure outlines, strung on walkways, decks, patios and gazebos, and stringing across or wrapping trees. For all year use, white is the most used color. Due to their smaller size, C7 bulbs work well in residential projects and historic buildings.

Decorating Tips for c7 Christmas Light Bulbs

What about decorating tips using C9 bulbs?

Going commercial? Go big. C9 bulbs are a go-to for those responsible for larger commercial displays and décor. LED C9 bulbs can be used on indoor trees, so they are good choice for big trees that are over 15’ high, such as those in town squares or corporate campuses.

Decorating Tips for c9 Christmas Light Bulb

Ready to get started on your project with C7 or C9 bulbs?

You’ll find commercial-grade LED C7 and C9 bulbs in faceted or smooth finishes and a wide range of colors, plus experienced support if you have more questions at Creative Displays