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.zuanz8t3o5piw3@desktop-ga2mpl8.lan...   
   > On Wed, 19 Dec 2018 23:53:42 -0000, Rod Speed    
   > wrote:   
   >   
   >>   
   >>   
   >> "William Gothberg" <"William Gothberg"@internet.co.is> wrote in message   
   >> news:op.zt920ry6o5piw3@desktop-ga2mpl8.lan...   
   >>> 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?   
   >>   
   >> No point when the only thing that has a problem is videos.   
   >>   
   >> You don't even see a problem with dashcams.   
   >   
   > You should.   
      
   But you don't.   
      
   > Surely they operate in a similar way to movie cameras?   
      
   It must be more complicated than that, most likely with the shutter time.   
      
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