XPost: alt.home.repair, uk.d-i-y   
   From: rod.speed.aaa@gmail.com   
      
   "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.   
      
   > Can you notice that a moving object jumps a few inches at a time across   
   > the screen?   
      
   Never seen that happen.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)