[bodhi_mind]

I get this effect when using a dimmed led headlamp in the rain. I can see the rain drop fall in discrete steps.

[jrockway]

I've definitely noticed that with my bike light. You don't notice the flickering normally, but rain makes it looks like you're playing a video game at 3fps. (I think I measured the flicker and the PWM frequency was like 400Hz, which is not quite as bad as 3fps.)