If a single bulb on one of the two parallel circuits has gone bad, it will shut down the one circuit, causing half the set to go dark. That is, if the lights are wired with two parallel circuits, which is the most common type sold.
Most strings of Christmas lights are wired to run on a circuit. Electrical current runs through each bulb on the string, in order to complete the circuit. If even one bulb is faulty, the circuit is broken and the lights will not operate.
If only half of the string will light up, that probably means the set contains two different circuits, each circuit operating one half of the string. One circuit has remained intact, but the other circuit is broken somewhere along the string.
The culprit may be a loose bulb. The string should be checked for any bulbs that are not screwed in tightly. If there are no loose or obviously damaged bulbs, the problem may be a broken filament. Each bulb on the dark half of the string will have to be removed and tested with a voltage tester, to make sure it is capable of passing current. Once the bad bulb is located it can be replaced with a new one.
Another possible culprit is a bad shunt in one of the bulbs. Some string lights contain shunts, which are designed to activate when a filament burns out, and pass the current along the circuit. When a shunt fails to activate, it breaks the circuit.Learn More
It's easy to turn a string of non-blinking Christmas lights into a string of festive twinkling lights. To reduce the risk of shock, Lowes emphasizes always unplugging any string of lights before replacing the bulbs.Full Answer >
To set up a Christmas village, make a plan that incorporates the space available, construct the base for the village, set up the train tracks, place the buildings and other elements, and add "snow" to the scene. Christmas villages, a tradition that began with the Moravian church, can range from small and intimate to extremely grand, including lights and animation.Full Answer >
A standard string of incandescent Christmas lights uses 40 watts of electricity. LED lights are more efficient, so a standard string uses only 4.8 watts.Full Answer >
LED Christmas lights, such as the ones made by the Philips Company, use less electricity and are safer to use than traditional incandescent light strings because they do not get hot. These LED lights can, however, end up costing a consumer more to maintain in the long run.Full Answer >