It's a simple string of miniature light bulbs, with some wiring inside that ... they're finally ready to be hung up on a Christmas tree.

From tangled lights to that inevitable burnt-out bulb that plunges the ... with both incandescent and LED lights, making it a versatile tool for any Christmas tree setup. While it might take ...

Test the Christmas light bulbs with an inexpensive tester. A Christmas tree light tester is an essential ... depending on your usage. Newer style LED (light-emitting diode) lights are the exception.

When Edison patented the light bulb in 1880, its exact value was hard ... had introduced Britain to the Teutonic tannenbaum—the Christmas tree—and the idea spread. In the States, President ...