I have 960 fps video of some LED bulbs in my house. It's very apparent that some bulbs do not flicker (perceptibly), some flicker at 120Hz, and some flicker at

I have 960 fps video of some LED bulbs in my house. It's very apparent that some bulbs do not flicker (perceptibly), some flicker at 120Hz, and some flicker at 60Hz. At night I can sweep my eyes across the bulbs and see the dashed lines resulting from them turning off and on.