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Re: [EVDL] LED Taillights - a money saver in gas cars? -rangeextenderin EV's? - an an

I think the greatest virtue of LED lights, after savings in
very energy critical applications like solar-lights, is in
the field of shock-resistance and longevity.
Never needing to replace a burned out light can be a much bigger
issue than saving a few watts in a vehicle that is designed to
produce 100,000+ Watts at the flick of a foot.
I doubt that the LED lamp's energy (gasoline) savings will be
noticeable.
I changed the lights on my bikes to LEDs, because the bulbs
kept rattling the filaments apart.

In an EV, you may increase your range, but calculate in the
order of fractions of a percent.

Cor van de Water
Systems Architect
Proxim Wireless Corporation http://www.proxim.com
Email: [email protected] Private: http://www.cvandewater.com
Skype: cor_van_de_water IM: [email protected]
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-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of (-Phil-)
Sent: Monday, September 24, 2007 10:49 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] LED Taillights - a money saver in gas cars? -rangeextenderin EV's? - an analysis

Or LED:
http://fourtitude.rely.net/cgi-bin/artman/exec/view.cgi/6/1113/printer

-Phil
----- Original Message -----
From: "(-Phil-)" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Monday, September 24, 2007 10:15 PM
Subject: Re: [EVDL] LED Taillights - a money saver in gas cars? - rangeextenderin EV's? - an analysis


> Another interesting one is to switch to Xenon HID for the headlights.
> A HID bulb is 35w versus 55 or 65w, so that's a savings of a minimum
> of 40w!
>
> As an aside, they are brighter and if you won't see brightness
> fluctuate because of 12v voltage fluctuation or sag.
>
> -Phil
> ----- Original Message -----
> From: <[email protected]>
> To: <[email protected]>
> Sent: Monday, September 24, 2007 9:40 PM
> Subject: [EVDL] LED Taillights - a money saver in gas cars? - range
> extenderin EV's? - an analysis
>
>
>> This file is saved at www.herringshaw.com/led.xls Let me know what you
>> think.
>> In building my Electric Car (88 Mazda getting the Solectria treatment) I
>> came across some LED taillight bulbs at Sherco-auto.com. You should
>> check them out - connectors and other stuff for good prices. ANYWAY, So
>> I wanted to see if there's a financial payback on these lights in a
>> ICE vehicle, assuming of course that these could extend the range on
>> an EV at night, which of course there is no price on!
>>
>> My car has 4 taillights, so I bought 4 @ $5 each (combo tail/Brake
>> Light) Check out the file to change numbers and see if you come up
>> with something different - with my analysis, if you drive more than
>> 12.5K miles/year with
>> your taillights on, you'll have a 20% payback. Put that into Gasoline
>> instead of Diesel, it'll do even better. What do you think on the
>> efficiency #'s?
>>
>> If you have to change a bulb anyway, then this is a no-brainer, but
>> fun to
>> analyze anyway. Make sure your Lens color matches the LED color - Make
>> sure your bulb mount faces the bub toward the lens (not always the
>> case, as in my car, so the LEDs are going into the Golf)
>>
>> Assumptions - All in Green can be changed (download the file for
>> changeables)
>>
>> Conventional Taillight Bulbs 100 Watts [email protected] 27W (maybe 27 is the brake
>> light, not the running light....)
>>
>> BTU/KWH 3414
>> BTU/Gallon 130000 Diesel
>>
>> Alternator Efficiency 70.00% [Turning Motion into Electricity]
>> Engine Efficiency 50.00% [Turning BTU's into Motive energy]
>>
>> $/Gallon 3
>> Cost of Bulbs $20.00 4 - 27W Equivalent Bulbs
>>
>>
>>
>> Taillights Used Per Hour
>> Watts used/hour 100
>> Efficiency Reduced Watts 285.71
>> BTU used /hour 975.43
>> Fuel used/hour 0.007503
>> $$/hour 0.022510
>>
>> Overall Vehicle
>> $/hour @ 48MPG (TDI Golf) 3.75
>> % of cost going to Taillights 0.60%
>>
>>
>> Hours needed to drive in 1 yr to reach 20% Rate of Return 177.70
>> Miles Driven @ 75 MPH 12438.98
>>
>>
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>>
>
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