XPost: sci.electronics.repair, sci.electronics.design, sci.elect   
   onics.components   
   From: gnuarm@gmail.com   
      
   On 3/22/2016 10:00 PM, DaveC wrote:   
   > On 22 Mar 2016, rickman wrote   
   > (in article ):   
   >   
   >> Didn't you say it used a *single* 1.5 volt AA cell? I think that would   
   >> make it 412 milliwatts not counting the conversion efficiency, so more   
   >> likely a 1/2 watt LED.   
   >   
   > 1.5v boosted to 4v (measured) output from the converter. 275 mA (measured) at   
   > the battery terminals. I make that to be 1100 mW. If presume 75 percent   
   > efficiency, 825 mW.   
   >   
   > No?   
      
   Perhaps I am missing something.  The battery terminals will be at the   
   battery voltage, no?  So why would you use 4 volts which is at the   
   output?  It would be 4 volts times the LED current or the battery   
   voltage times the input current.   
      
   --   
      
   Rick   
      
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