XPost: alt.home.repair, uk.d-i-y
From: Gothberg"@internet.co.is
On Thu, 20 Dec 2018 21:52:55 -0000, % wrote:
> On 2018-12-20 2:48 p.m., William Gothberg wrote:
>> On Thu, 20 Dec 2018 21:40:48 -0000, % wrote:
>>
>>> On 2018-12-20 2:38 p.m., William Gothberg wrote:
>>>> On Thu, 20 Dec 2018 21:04:01 -0000, Rod Speed
>>>> wrote:
>>>>
>>>>>
>>>>>
>>>>> "William Gothberg" <"William Gothberg"@internet.co.is> wrote in message
>>>>> news:op.zub0oriqo5piw3@desktop-ga2mpl8.lan...
>>>>>> On Thu, 20 Dec 2018 17:13:52 -0000, trader_4
>>>>>> wrote:
>>>>>>
>>>>>>> On Thursday, December 20, 2018 at 12:07:40 PM UTC-5, William Gothberg
>>>>>>> wrote:
>>>>>>>> On Thu, 20 Dec 2018 16:25:22 -0000, trader_4
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>> > On Thursday, December 20, 2018 at 7:29:53 AM UTC-5, William
>>>>>>>> Gothberg
>>>>>>>> > wrote:
>>>>>>>> >> On Thu, 20 Dec 2018 11:57:01 -0000, whisky-dave
>>>>>>>> >> wrote:
>>>>>>>> >>
>>>>>>>> >> > On Wednesday, 19 December 2018 16:35:05 UTC, 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?
>>>>>>>> >> >
>>>>>>>> >> > It's easy but that isn't the point. The most efficient way of
>>>>>>>> >> > driving to make maximium power into the LED means yuo have to
>>>>>>>> >> > pulse the LED's. Using a capcitor to smooth out the DC is yet
>>>>>>>> >> > another mode of inefficincy as it would get warm due to current
>>>>>>>> >> > flow. Indictors in series might be better but then you run the
>>>>>>>> risk
>>>>>>>> >> > of 'radio' interference.
>>>>>>>> >>
>>>>>>>> >> Being inefficient would presumably make it impossible to get
>>>>>>>> enough
>>>>>>>> >> brightness out of LEDs that fit into the lamp holder. The LEDs
>>>>>>>> would
>>>>>>>> >> get too hot trying to give out enough brightness for a car
>>>>>>>> headlight.
>>>>>>>> >>
>>>>>>>> >> However cars vary a lot, some are easy to detect flickering, some
>>>>>>>> >> difficult, and some impossible (with the naked eye). Perhaps
>>>>>>>> they
>>>>>>>> >> just use a higher frequency?
>>>>>>>> >>
>>>>>>>> >> Taillights are pretty bad on a lot of cars, as they dim the
>>>>>>>> >> brakelights by deliberately flickering them.
>>>>>>>> >
>>>>>>>> > Either you have eyes that are way more sensitive to this or
>>>>>>>> you're in
>>>>>>>> > a
>>>>>>>> > country that uses different car lights than here in the USA.
>>>>>>>> There
>>>>>>>> > are a lot of cars with LED lighting, headlights and rear
>>>>>>>> lights, and
>>>>>>>> > I've never noticed this flickering, nor have I ever heard it
>>>>>>>> mentioned
>>>>>>>> > before this thread. I haven't noticed flickering from any LED
>>>>>>>> lights
>>>>>>>> > I've used either.
>>>>>>>>
>>>>>>>> I can see flicker on a 60Hz CRT monitor, but not on a 90Hz one, so
>>>>>>>> that'll give you an idea on how good my eyes are.
>>>>>>>>
>>>>>>>> Can you see flicker on tailliights if you scan your eyes across the
>>>>>>>> scene?
>>>>>>>
>>>>>>> Like I said, I haven't noticed it in the driving I've done. Nor
>>>>>>> have I
>>>>>>> heard anyone else mention it. Next time I come across a car that has
>>>>>>> LEDs I'll look more closely and see if I can see anything. If just
>>>>>>> scanning reveals it, you;d think a lot of people would be noticing
>>>>>>> it.
>>>>>>> Scanning is a part of driving.
>>>>>>
>>>>>> I'd estimate about 1 in 5 people can see it,
>>>>>
>>>>> Its nothing like that high and we know that because nothing
>>>>> like that many saw any flickering with fluorescent lights.
>>>>
>>>> Er.... most people I know can see fluorescent flicker. It doesn't annoy
>>>> most of them, but they can detect it. One in five people I know could
>>>> see 60Hz monitor flickering. And about the same can see car lights
>>>> flickering.
>>>>
>>>>>> similar to how many can see flicker on a 60Hz CRT computer monitor.
>>>>>
>>>>> Nothing even remotely like 1 in 5 can see that.
>>>>
>>>> You must know some people with really shitty eyesight. I noticed that
>>>> more people who were younger and/or didn't wear specs could see the
>>>> flicker.
>>>>
>>>>>> Don't most cars have LEDs now? Or does your area have a lot of older
>>>>>> cars? People (stupidly) around here seem to like cars that are no
>>>>>> more
>>>>>> than 10 years old. I don't think many cars after 2008 had bulbs.
>>>>>
>>>>>> Searching for "LED tail light flicker" without the quotes in google
>>>>>> produces 4.5 million results!
>>>
>>> the same thing happens when i type your name and add the words gutless
>>> idgit
>>
>> Cite link.
>
> you don't know how to type your name , come off it
Your name is not %
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