XPost: uk.d-i-y, alt.home.repair, alt.sci.physics   
   From: CFKinsey@military.org.jp   
      
   On Fri, 04 Oct 2019 20:32:33 +0100, Mark Lloyd  wrote:   
      
   > On 10/3/19 1:29 PM, Robert wrote:   
   >> On 03/10/2019 14:29, Commander Kinsey wrote:   
   >>> Why do LEDs generate heat? I want a technical answer not "because   
   >>> they're inefficient". And will we ever make them more efficient?   
   >> Besides the inefficiencies in the LED itself which other posters have   
   >> covered, LED lamps have some current regulation or power supply built-in   
   >> which will not be 100% efficient and thus generates heat.   
   >   
   > I have a LED   
      
   That irritates me, why don't you write "an LED"?  How do you say "LED"?  I say   
   "Ell Eee Dee", not "Light Emitting Diode".  So it needs an "an", not an "a".   
      
   > bulb (60W equivalent) in a lamp here.   
      
   60W?  Are you a Klingon and love darkness?  I use 100W and 150W bulbs only.    
   And lots of them.  My living room (7 metres by 4 metres) contains 13 90W bulbs.   
      
   > The bulb itself   
   > doesn't get hot like an incandescent bulb does. What gets hot is an area   
   > around the base.   
      
   Through the heatsink probably, most of the heat is generated by the LEDs, not   
   the far more efficient power supply.   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)