XPost: uk.d-i-y, alt.home.repair   
   From: Gothberg"@internet.co.is   
      
   On Thu, 20 Dec 2018 18:50:23 -0000, Rod Speed  wrote:   
      
   >   
   >   
   > "William Gothberg" <"William Gothberg"@internet.co.is> wrote in message   
   > news:op.zubl67f1o5piw3@desktop-ga2mpl8.lan...   
   >> On Thu, 20 Dec 2018 09:36:02 -0000, Jon Fairbairn   
   >>  wrote:   
   >>   
   >>> "William Gothberg" <"William Gothberg"@internet.co.is> writes:   
   >>>> Agreed. All I can detect (with my digital camera) is that   
   >>>> one brand of LED light I have flickers about 5 times less   
   >>>> (not sure if it's smother or faster) than the others.   
   >>>   
   >>> Try a longer exposure and move the light rapidly relative to the   
   >>> camera.   
   >>   
   >> Good idea.   
   >>   
   >> I just tried it with the best lamps I have, which show a slight variation   
   >> in brightness at exactly 100Hz, which must be seeping through from the   
   >> mains.  However the LEDs never go off, they just change brightness by 8%.   
   >>   
   >> With the worst lamp, same 100Hz, but they actually go right on and off,   
   >> with a duty cycle of 0.6.   
   >>   
   >> Am I right in thinking these aren't SMPS at all?   
   >   
   > Yep. those will have simple capacitance droppers.   
      
   Correct, although there is a failed smoothing cap on the end, which I still   
   have to get round to replacing.  I've got as far as finding something that   
   will fit in the garage....   
      
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