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   sci.electronics.basics      Elementary questions about electronics      72,318 messages   

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   Message 71,046 of 72,318   
   AK to default   
   Re: Run time for leds   
   24 Apr 19 09:03:45   
   
   From: scientist77017@gmail.com   
      
   On Tuesday, April 23, 2019 at 5:26:24 PM UTC-5, default wrote:   
   > On Tue, 23 Apr 2019 12:09:43 -0700 (PDT), Andy   
   >  wrote:   
   >   
   > >.24 watts X 3 = .72 watts. Is that current or light output?   
   >   
   > The original post:   
   >   
   > I have (8) 5 watt LEDs that are run from a 12VDC source.   
   >   
   > (3 18650 batteries at 3000 Ma hrs each.   
   >   
   > I want to know the approx run time.   
   >   
   > 40 watts dissipated by LEDs with maybe 33 amp-hours of battery.   
   >   
   > I looked at the link and don't see where he gets 5 watts per bulb   
   > though...   The incandescent 158 lamp they are intended to replace   
   > only dissipates 3.4 watts at 14 volts.   
      
   Current used is 87 milliamps for one led.   
      
   Andy   
      
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