Voltage on led lighting circuit

[John165]

We just finished a job, large metal garage, & were checking voltage, when something interesting happened. With the lights on the voltage was 124.6v, with the lights off it was 120.8v. The only thing I can think of is the drivers back feeding or something like it. Is this a common or is there something wrong? We have about 1600 watts on the circuit, the other leg is unaffected. Thanks, John

 

[LarryFine]

My first guess would be a neutral issue, which you basically addressed.

Does switching the unaffected line's load affect this line's voltage?

 

[retirede]

Try a different meter. Maybe the LED circuitry is putting out some higher frequency noise that is affecting your meter.