XPost: sci.electronics.repair, sci.electronics.design, sci.elect   
   onics.components   
   From: not@home.cow   
      
   On 22 Mar 2016, DaveC wrote   
   (in article<0001HW.1CA25FD300316D8E1132D13CF@news.eternal-september.org>):   
      
   > > 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   
      
      
   > Yikes! Of course you’re right.   
   >   
   > Thanks.   
      
      
   Just measured working light of same model: using power supply @1.5v (measured   
   at flashlight battery terminals), the current from the ps is 400 mA.   
   Estimating 75 percent efficiency that makes about 450 mW.   
      
   So a 1/2W replacement LED might be what I’m looking for.   
      
   Thanks.   
      
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