If the nearly invisible itty-bitty shunts come loose due to mfr defect, vibration or other cause, they will not function correctly. NOTE: Super tiny shunt wires that wrap around the base of the two filament support wires inside each bulb are what allow the rest of the string to stay lit when one goes out. The trigger operated 'zapper' that welds loose shunts inside the bulbs. The Light Keeper Pro has many functions but the ones that shine are as follows: In addition, I use dimmers in certain settings and found that 'dimmable' LED mini-lites do not work as well as incandescents when set to very low light levels.) (Note: I have been using more LED based mini-lites in recent years, but I have found the light characteristics of LED strings are so much different that that of incandescent that they do not work as well in many situations.

I have found Light Keeper Pro the best 'as seen on TV' tool ever advertised in that fashion, and it has saved me many countless hours of frustration maintaining the hundred or so seasonal strings and another dozen or so that are more or less permanently installed.

This is a review for the Light Keeper Pro for incandescent mini-lite strings, which I have used for at least 5 years now. I have been using incandescent mini-lite strings for decorating in a commercial setting for over 20 years. Thanksgiving / Fall Lights and Decorations.Commercial Grade Heavy Duty String Lights.String Light Kits - Indoor / Outdoor - Light Bulbs Included.

How does the light keeper pro work