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

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]xx>
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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