Christmas lights bokeh - a question

This is a video (about 2 min. long). I placing it here for my bokeh photo. While I was taking some photos of the bokeh, I noticed in the live screen that the lights seemed to be fading and coming back in. The lights were not blinking to the visible eye. So I shot this video. Any idea what was going on? My DH speculated that the power to the lights was cycling 60 times per second, causing the lights to dim and come on fully. Obviously if this is happening, it's not really visible to my naked eye. The camera was on a tripod and I did not touch any of the settings during the making of this video.

Just a suggestion. Try increasing the speed (in settings "gear") to 2 to watch it double time.
It probably is down to the slight difference between the cycles of the lights and the sensor, with one of them being slightly faster. So the sensor is catching it at progressively different stages and eventually getting to the down cycle of different lights. It's a nice effect!
November 25th, 2017  
they are toying with you
November 25th, 2017  
Fascinating. Well done!
November 25th, 2017  
Interesting effect.Like the car wheels going backwards or forward or standing still depending on the speed they are turning.the frequency of your power supply 60 hertz (or cps) the frequency your camera is operating at ????
November 25th, 2017  
Interesting and well done for noticing!
November 25th, 2017  
No idea, but it's really cool to watch!
November 25th, 2017  
Great video. Like it.
Thank you for you so nice comment. You`re very kind.
November 25th, 2017  
Don't know, I am not technical enough, but really nice to watch.
November 25th, 2017  
@miseria @kali66 @s4sayer @peterlgrave @craftymeg @jamibann @pyrrhula @overalvandaan Thanks for viewing and for speculating on what is going on. It was fascinating to see when I sat here with the camera on. I guess it's like my 8th grade science teacher used to say, "It's magic!"
November 25th, 2017  
How interesting! Great bokeh, with a bonus!
November 26th, 2017  
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