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The Main Difference: Size!

C7 Bulbs are much smaller than the larger C9 Bulb. C-9's are longer, wider, and fit into a bigger socket. As you can see from the photographs above, the C7 Bulb is usually 2-1/8in in length and 7/8in in width. In comparison, the C9 Bulb measures 2-7/8in in length and 1-1/8in in width.

LED varieties

C7 LED light bulbs use 90% less electricity, but are the same size, and can fit into the same size base as incandescent lights. They generally have 3 LEDs per base and come in smooth, faceted, and dimmable finishes. C9 LEDs have the same basic attributes as the C7s but usually have 5 LEDs to the base.Jan 5, 2015

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.

Commercial LED light strings with co-axial connectors are one of the most popular styles of commercial Christmas lights among professional installers due to their exceptional durability.Aug 24, 2021

Short Answer: No, you can't lengthen or shorten standard series-wired incandescent and LED Christmas tree light strings that are made with 2 or 3-wire harnesses. ... If, however, you are installing C7/C9 18 AWG Christmas light cords with sockets and screw in bulbs that are wired in parallel, yes, you can shorten them.Dec 14, 2018

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.

A string of 25 incandescent C9 bulbs — the big plump ones often used outdoors — uses 175 watts of electricity, which works out to a whopping $15.12 to run over a season (assuming 12-hour-a-day operation for 45 days).Nov 24, 2017

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…Sep 5, 2019

For C7 and C9 or larger bulbs, string no more than 50 lights together. Turn lights off when you leave home or when you go to bed. Use surge protectors.Jul 15, 2010

C9 bulbs are Lit Professional Lighting's light of choice. They still maintain the shape of C6, and C7 lights, but are the largest yet. They are 1 ¼” round and 2.5” tall, a full inch taller than the C7. C9 light wattage can be up to twice as powerful as C7 lights.Jan 3, 2020

C7 & C9 LED Bulb Finishes

Smooth Opaque - LED bulbs with this finish mimic the design of traditional incandescent lights and are perfect for an outdoor party or colorful Christmas light display.

Incandescent C9 bulbs can easily be swapped out of your old strands for these energy-saving retrofit LED C9 bulbs. This will save you money! Incandescent bulbs use significantly more power than LED bulbs and are much more fragile than these plastic, sturdy, multifaceted LED bulbs that do not break, chip, or fade.

• Bulb Size and Bases. C7 bulbs are smaller than C9 bulbs by 1 inch. C7 bulbs are 2 inches long and C9 bulbs are 3 inches long.
• Electrical Wattage. The two bulbs' electrical wattage is also different. ...
• Illumination Level. C9 lights shine brighter than C7 lights and are more visible than C7 lights. ...

• Conical 5mm Wide-Angle LEDs are the most durable and brightest Christmas lights available. Almost every professional Christmas light installer uses conical LEDs for their displays. Conical LEDs are waterproof and snowproof because the LED is injected molded into the plastic cordage. Conical LEDs are also 25% brighter than an incandescent indoor Christmas light.

• Running incandescents will set you back about 35 bucks over the course of the season, while switching to full LED will cost just a bit over $4 . The real savings come if you're using the big C9 lights, however. Running four strands of 25 incandescent C9s will cost over 60 bucks for the season.

Use our C9 LED Christmas lights to create bold outdoor Christmas light displays. These energy efficient C9 LED light bulbs are beautiful, super bright, versatile, and will shine for 50,000 hours. Incandescent C9 bulbs can easily be swapped out of your old strands for these energy-saving retrofit LED C9 bulbs.