XPost: alt.home.repair, uk.d-i-y   
   From: Gothberg"@internet.co.is   
      
   On Thu, 20 Dec 2018 04:16:35 -0000, Clare Snyder  wrote:   
      
   > On Wed, 19 Dec 2018 10:21:41 -0600, 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.   
   >>   
   >> [snip]   
   > Very obvious with flourescents.   
      
   Fluorescents can operate from DC, but you'd need a resistive ballast, which   
   wastes energy.  But you could use an invertor to make very high frequency AC   
   to stop visible flicker.   
      
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