XPost: uk.d-i-y, alt.home.repair   
   From: Gothberg"@internet.co.is   
      
   On Thu, 20 Dec 2018 13:19:55 -0000, whisky-dave  wrote:   
      
   > On Thursday, 20 December 2018 13:00:02 UTC, William Gothberg  wrote:   
   >> 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.   
   >>   
   >> I wonder, if I fed the lamps with mains voltage DC, simply a bridge   
   rectifier and a huge capacitor,   
   >   
   > No they'd probbaly blow up, don;t forget a bridge recifir would produce a   
   voltage of at leat 330V and the power dissapated by each LED would also   
   increase .   
      
   I thought about that, and the cheapest one, which seems to be just a bridge   
   rectifier straight to the LEDs, would make them 65% brighter.  But the others   
   should only get 4% brighter.  A switched mode supply fed by DC at the peak   
   voltage of the mains,    
   would still have its bulk capacitor at about the same voltage.  It's already   
   doing what I'm suggesting I do externally.  They're rated at 85-260V, so I   
   assume they're switched mode.   
      
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