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.

On the other hand, C9 lights are best used for outdoor Christmas decorations. They're also great for string lights because they produce a bright, white light. You can also use them for accent lights or spotlights.

By combining a red, blue, and green LED, each of which is controlled simultaneously by the controller unit, the color-changing LED is able to create every color in the rainbow. For example, if the red and green LED are turned off but the blue LED is turned on, the LED unit will give off a blue light.

While LED lights are estimated to last 10 times longer than traditional light bulbs, C9 LED Christmas Lights are guaranteed to last a lifetime. This means no more buying replacement bulbs or new strings of lights every year.

C9 LED Bulbs 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. This will save you money!

25 Pack of Multi Colored Ceramic C9 LED Plastic Bulbs Unlike their incandescent counter-parts, these bulbs will not get hot, giving you more options for indoor and outdoor applications, and they are plastic so they won't break!

For an incandescent bulb, we recommend the C9 bulbs from Opticore; that company makes LED bulbs that are comparable to the Pro-Christmas bulbs, too.

Then the metal ends of the lights are cut and shaped. Like the string the led light bulbs are also dipped in flux. The bulbs are then finally soldered with the wire.

LED Christmas lights provide light by using light-emitting diodes rather than filaments. LED lights are thus more efficient, robust, and long-lasting than fluorescent incandescent lights. They don't burn out like conventional bulbs, and they don't become hot to the touch, making them safer.

LED strings will generally last for 35,000 to 50,000 hours, or six years of continuous use, before they diminish to 70 percent of their original output. Blast them all night if you need. They'll stand the test of time - at least, for a while.

Indeed, some LED light creations will stress that they can be only used outdoors for up to 90 days – leaving them exposed to the weather over a longer period may lead to the bulbs cracking or the cables drying out and breaking to expose the wires.

LEDs often have a lifespan of 5, 10, 17 or even 20 years printed on their packaging.

Even the best LED light bulbs will lightly warm up because of the internal components that create the light. The base of the LED bulb acts as a heat sink and allows the surface of the bulb to maintain a safe temperature. However, if these components are not adequately ventilated, it will produce more heat output.