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

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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