One of the yardsticks for good LED design is that the electronic circuitry should not produce any perceptible flicker. Flicker is potentially harmful to health and can trigger migraines and epileptic fits – but the difficult word here is ‘perceptible’.
A few years ago I attended a voice workshop near Tara in Ireland; one of those hippy-dippy events that included more than a bit of primal screaming. One of the women there was clearly struggling with the way things were going and I asked her what was going on for her. ‘I am SO bored.’