XPost: uk.d-i-y, alt.home.repair   
   From: rod.speed.aaa@gmail.com   
      
   "William Gothberg" <"William Gothberg"@internet.co.is> wrote in message   
   news:op.zubprsfco5piw3@desktop-ga2mpl8.lan...   
   > 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.   
      
   Not necessarily. Its quite possible to do a capacitor dropper powering   
   a current regulator that way. Have a look a Big Clive's teardowns.   
      
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