High School LED light and guitar string (strobe light effect)

[nmsurobert]

I've trying to explain this to myself but I know I'm missing something.
I tuned the low E string to B. The frequency of that note is about 62 Hz. When I play that note under the led lights in my backyard I can see the string oscillate back and forth.
After doing some reading, the LED light flickers about twice that of what the house is putting out. So the led light is flickering at 120 Hz. Is that why I see the string in two opposing positions and not in a stationary position? If the string oscillated at 120 Hz would it appear stationary?
Here is a video of what I'm talking about...
https://1drv.ms/v/s!AgZi6Wn97aMQg235QWqKNXhVGwwy

 

[kuruman]

You are correct. You might be able to tune your guitar using the LED, at least one string.

 

[nmsurobert]

You are correct. You might be able to tune your guitar using the LED, at least one string.

Awesome! Thank you.