The LightKeeper Pro is a Christmas miracle, especially when you've discovered the Christmas lights you carefully packed away last year aren't working. But before you turn into the Grinch, save the ...

In this setup, if one bulb burns out in the strand, the current won't flow through the entire circuit, which means the entire string of Christmas lights will go out. Some of these could be ...

All it takes is one bad bulb to keep all of the other Christmas lights from lighting up. The trouble is, how do you find that one bad bulb? This gadget is supposed to help you find it. A bad bulb ...