Re: Odd Question

[Jeff Clearwater <clrwater@valinet.com>]

Hi Auf,

I don't have exact numbers but I do know this.  The night lights they 
sell are .04 watts!  That's 1/100 of a 4 watt incandescent night 
light. Of course they don't put out as much light.  I would guess 
they put out about 1/3 - 1/4 of the lumens.  That still makes them 
roughly 25-33 times more efficient!

Who out there has the actual numbers?

jc



>I have a somewhat odd question for all you EV Gurus out there. What 
>is the energy efficiency of high output LEDs vs. Incandescent bulbs? 
>i.e. What is the Lumen per Watt output of each? I was driving home 
>from work a couple of months ago and saw a brand new luxury sedan in 
>front of me, stopped at the light. I realized that it's rear lights 
>were banks of LEDs instead of incandescent lights. I've also know 
>that many postal trucks down here use the same setup. I was 
>wondering if there is an energy advantage to these, or are they just 
>more convenient due to lasting damn near forever? My thinking is 
>this: If there is an advantage, replacing turn indicators, reverse, 
>tail and brake lights with LEDs would lower the drain on a DC/DC or 
>accessory battery. I realize that headlights are the biggest single 
>drain (of the essentials) but any little bit helps, especially if it 
>is draining your primary battery pack. Any thoughts from you guys 
>that actually know what they are doing?
>--
>
>						Auf wiedersehen!
>
>
>	_____________________________________________________________
>"..Um..Something strange happened to me this morning."
>
>"Was it a dream where you see yourself standing in sort of Sun God 
>robes on a pyramid with a thousand naked women screaming and 
>throwing little pickles at you?"
>
>"..No."
>
>"Why am I the only person that has that dream?"
>						-Real Genius
>
>_________________________________________________________
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-- 
~~~~~~~~~~~~~~~~~~~
Jeff Clearwater
Ecovillage Design Associates
Community and Village Scale Renewable Energy Systems
413-259-1900, clrwater@valinet.com

Board Member - Living Routes-Ecovillage Education Consortium 
http://www.LivingRoutes.org
Council Member - Ecovillage Network of the Americas 
http://www.gaia.org/secretariats/ena/
Sirius Community, 72 Baker Rd, Shutesbury, MA  01072
(413) 259-1254, (413) 259-1255 Fax
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