XPost: alt.home.repair, uk.d-i-y   
   From: Gothberg"@internet.co.is   
      
   On Thu, 20 Dec 2018 23:57:18 -0000, %  wrote:   
      
   > On 2018-12-20 4:16 p.m., William Gothberg wrote:   
   >> 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 %   
   >   
   > yes it is but that's off topic right now ,   
      
   No, it's part of a nym you made up.   
      
   > right now we're talking about your admission you can't spell yours   
      
   I have not misspelt it.  I used a fake one.   
      
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