how to tell which light is out on christmas lights

There are a few different ways to find the bad light on your Christmas lights. One way is to shine a flashlight on each bulb and look for one that doesn't light up. Another way is to touch the bulbs with your fingers, and the one that feels cold is the bad bulb. If your lights are tangled, you can also use a current sensor to find the bad bulb. If you have any more questions, feel free to ask me.