XPost: alt.home.repair, uk.d-i-y   
   From: Gothberg"@internet.co.is   
      
   On Tue, 25 Dec 2018 21:55:16 -0000, Rod Speed  wrote:   
      
   >   
   >   
   > "William Gothberg" <"William Gothberg"@internet.co.is> wrote in message   
   > news:op.zulktmp2o5piw3@desktop-ga2mpl8.lan...   
   >> On Tue, 25 Dec 2018 21:00:53 -0000, Rod Speed    
   >> wrote:   
   >>   
   >>>   
   >>>   
   >>> "William Gothberg" <"William Gothberg"@internet.co.is> wrote in message   
   >>> news:op.zulf8qz8o5piw3@desktop-ga2mpl8.lan...   
   >>>> On Tue, 25 Dec 2018 18:33:27 -0000, Rod Speed    
   >>>> wrote:   
   >>>>   
   >>>>>   
   >>>>>   
   >>>>> "William Gothberg" <"William Gothberg"@internet.co.is> wrote in message   
   >>>>> news:op.zulb102po5piw3@desktop-ga2mpl8.lan...   
   >>>>>> On Tue, 25 Dec 2018 17:33:52 -0000, Rod Speed   
   >>>>>>    
   >>>>>> wrote:   
   >>>>>>   
   >>>>>>>   
   >>>>>>>   
   >>>>>>> "William Gothberg" <"William Gothberg"@internet.co.is> wrote in   
   >>>>>>> message   
   >>>>>>> news:op.zukr2cpgo5piw3@desktop-ga2mpl8.lan...   
   >>>>>>>> On Thu, 20 Dec 2018 04:22:39 -0000, Clare Snyder   
   >>>>>>>>    
   >>>>>>>> wrote:   
   >>>>>>>>   
   >>>>>>>>> On Wed, 19 Dec 2018 19:36:51 -0000, "William Gothberg" <"William   
   >>>>>>>>> Gothberg"@internet.co.is> 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.   
   >>>   
   >>> Bullshit.   
   >>   
   >> 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.   
      
   >> 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.  I guess you don't bother with HD TV.  I guess   
   if you play computer games you don't care if the CPU is slow and the frame   
   rate is abysmal.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)