Yes, you can measure voltage fluctuations with a multimeter. To measure voltage fluctuations, you need to set the multimeter to measure AC voltage and connect the probes to the AC power source or the outlet in question. The display of the multimeter will show the voltage level, and you can use this to measure any fluctuations or variations in voltage.

As for LED lights, fluctuations in voltage could affect the brightness or color of the lights. It's always a good idea to check the voltage levels and ensure they are within the appropriate range for the LED lights to function properly. You can use a multimeter to measure the voltage across the LED itself or the resistor that is connected to the LED to ensure that the voltage is within the recommended range. If the voltage is too high or too low, you may need to adjust the circuit to ensure that the LED is getting the correct voltage.
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