how to tell which christmas light is out

To check which Christmas light is out, you can try the following steps: 1. Turn off all other lights in the room and allow your eyes to adjust to the dark. 2. Focus your gaze on the string of lights. 3. Look for any bulbs that are not emitting light. 4. If you're still unsure, you can use a voltage tester to determine which bulb is defective. The tester will indicate whether the light string is receiving power or not. If the tester doesn't light up, that means the bulb is defective and needs to be replaced.