XPost: uk.d-i-y, alt.home.repair   
   From: Gothberg"@internet.co.is   
      
   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?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)