"William Gothberg" "William wrote in message
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On Tue, 25 Dec 2018 21:55:16 -0000, Rod Speed
wrote:



"William Gothberg" "William wrote in message
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On Tue, 25 Dec 2018 21:00:53 -0000, Rod Speed
wrote:



"William Gothberg" "William wrote in message
news On Tue, 25 Dec 2018 18:33:27 -0000, Rod Speed

wrote:



"William Gothberg" "William wrote in
message
news On Tue, 25 Dec 2018 17:33:52 -0000, Rod Speed

wrote:



"William Gothberg" "William wrote in
message
news On Thu, 20 Dec 2018 04:22:39 -0000, Clare Snyder

wrote:

On Wed, 19 Dec 2018 19:36:51 -0000, "William Gothberg" "William
wrote:

On Wed, 19 Dec 2018 17:47:17 -0000, trader_4

wrote:

On Wednesday, December 19, 2018 at 11:35:06 AM UTC-5, William
Gothberg
wrote:
On Wed, 19 Dec 2018 16:21:41 -0000, Mark Lloyd

wrote:

On 12/19/18 6:01 AM, William Gothberg wrote:

[snip]

They probably are fairly crude. I know they flicker, for
example
if I
use my cordless drill, the chuck appears to spin the wrong
way
under the
LED lighting.
I remember seeing that with a washing machine (under
fluorescent
lights). As the tub was slowing down, the row of holes
around
the
tub
would appear to reverse direction. Same thing with (spoked)
wagon
wheels
in movies.

It looks absolutely ridiculous with modern cars with LED
headlights
in
films. How hard can it be to put a smoothing capacitor on the
output
of the power supply?

I've never noticed that. Any films come to mind?

A lot of Top Gear programs showing the DRLs of cars fitted with
LEDs.
With a feature film, they might take the time/trouble/money to
do
something to stop it.

It seems especially
weird, since cars have a 12V supply with a big battery to
smooth
anything out. I guess the power supply that reduces that to
whatever
the LED headlights use though might have a switching power
supply
these
days too.

AFAIK it's deliberate, making the LEDs operate brighter than
they
are
capable of, but only 1/4 of the time. Our eyes just see the
brightest
part of the cycle, so we think they're four times brighter than
the
LED
is really capable of, without overheating itself.

That is PWM Overdrive. Peak junction current is over the nominal
rating, but the average power consumption is below nominalmaximum
current - and the peak lumen output is significantly enhanced
without
reducing the junction life appreciably.
THIS would definitely cause flicker as there is a "significant"
dead
period between the "strobe flashes"

Agreed, although Rod thinks only freaks can see it.

Its true with car lights.

You're obviously wrong,

We'll see...

just by the number of articles on the internet about it.

That's just the freaks howling about seeing it.

If it were a small number of freaks, there wouldn't so many articles
and
studies into it.

Bull****.

Tell me, out of interest, when you watch TV at the usual (before HD)
25fps
interlaced, can you see that it's made up of seperate images?

Meaningless question.

It would show us whether our eyes are inferior or not.

Only if it was actually a viable question.

Can you notice that a moving object jumps a few inches at a time across
the screen?

Never seen that happen.

Then your eyesight really sux.

Nope, those doing the movie have enough of
a clue to film it properly so that doesn't happen.

I guess you don't bother with HD TV.

Guess again.

I guess if you play computer games you don't care if the CPU is slow and
the frame rate is abysmal.

The only computer game I bother with is Freecell Pro and it
works fine with any cpu and the frame rate is never a problem.