"William Gothberg" "William wrote in message
news
On Thu, 20 Dec 2018 09:36:02 -0000, Jon Fairbairn
wrote:

"William Gothberg" "William writes:
Agreed. All I can detect (with my digital camera) is that
one brand of LED light I have flickers about 5 times less
(not sure if it's smother or faster) than the others.

Try a longer exposure and move the light rapidly relative to the
camera.

I wonder, if I fed the lamps with mains voltage DC, simply a bridge
rectifier and a huge capacitor, they'd reduce their flicker.

Wont work at all if they use capacitor droppers and
they very likely do because those are the only cheap
droppers for dropping such a large voltage.

Very easy to try tho and see if it works.

The cheap **** LED lamp I have that actually flashes at 100Hz would most
likely get much brighter and burn out, so I'd have to adjust that, but the
others which only flicker 8% would just get 4% brighter.