Holiday Tree Lights

How to Maintenance your Christmas Lights Part II

  • October 16, 2010

Click here for Part I of this article

Power Setup

You don’t need to read your electric bill to know that outdoor Christmas lights can draw a huge amount of power. 100 feet of incandescent C9 bulbs, for instance, draw 3 and half times more power than most televisons! Needless to say, if you plug too many light strings into one plug, you will quickly overload that circuit.

Most homes have a 16 amp plug in the front and back yard; however, that circuit is usually shared with a room in the home, so not all 16 amps are usable. If you are planning a large Christmas light display, it is wise to calculate the number of amps your Christmas lights and decorations draw to make sure it is far less than 16 amps.

Amperage is usually posted on the UL tag at one end of your light string. If it is not, use this formula to determine the amperage of your light strings:

Number of Feet x Number of Watts Per Bulb / 125 Volts = Number of Amps

Using the example above:

100 Feet of C9 Bulbs x 7 Watts per Bulb / 125 Volts = 5.6 Amps.

Assuming other electrical devices are not using this circuit, you could plug additional lights or decorations into your outdoor plug. However, you should check the UL tag for maximum connections (usually 3) before plugging additional lights in end-to-end.

Note: Most Mini Light strings are not rated in watts, but amps, so the math is done for you.


Please note: This information is just a general guideline to assist you in your project. With any electrical product or situation there is a risk of electrical shock. DFW Christmas Lights and it’s parent company, Dallas Curb Appeal accepts no liability for the content of this article, or for the consequences of any actions taken on the basis of the information provided, unless that information is subsequently confirmed in writing. Any views or opinions presented in this e-mail are solely those of the author and do not necessarily represent those of the company-

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