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Nerys · 11-24-2010, 12:25 PM

the problem is by the time you have enough LED's to be bright enough (around 1 watt) the resistor is not sucking down 5 watts IE your taking 6 watts

the incandescent takes 5-8 watts. IE you defeat one of the major reasons to use LED's

I have discovered some stepping regulators (90%+ efficient) that will do what I need but man they are expensive. $15 a pop and I need 1 for EACH LED.

I could gang up LED's till I am near 14v and then use resistors (the voltage drop is what sucks the amps) but now I am consuming FAR more watts than I need to I would need 7 yellow or 7 red led's for each one but now I am using 7 watts. too bright for the need as well and again back into the wattage range of the Incans. the point is to reduce power to reduce alternator load to increase fuel economy :-)

problem is I need 12 bulbs. so with single 1 watt LED's thats 12 watts or just slightly more power than a single nav light and almost HALF the power of a single brake or turn signal bulb. IE huge power reduction.

but they take 2v each :-)

11-24-2010, 12:25 PM	#10 (permalink)
Nerys Grrr :-) Join Date: May 2008 Location: Levittown PA Posts: 800 Cherokee - '88 Jeep Cherokee 90 day: 19.44 mpg (US) Ryo-Ohki - '94 Geo Metro Xfi 90 day: 50.15 mpg (US) Vger 2 - '00 Plymouth Grand Voyager SE Ninja - '89 Geo Tracker 90 day: 30.27 mpg (US) Thanks: 12 Thanked 31 Times in 25 Posts	the problem is by the time you have enough LED's to be bright enough (around 1 watt) the resistor is not sucking down 5 watts IE your taking 6 watts the incandescent takes 5-8 watts. IE you defeat one of the major reasons to use LED's I have discovered some stepping regulators (90%+ efficient) that will do what I need but man they are expensive. $15 a pop and I need 1 for EACH LED. I could gang up LED's till I am near 14v and then use resistors (the voltage drop is what sucks the amps) but now I am consuming FAR more watts than I need to I would need 7 yellow or 7 red led's for each one but now I am using 7 watts. too bright for the need as well and again back into the wattage range of the Incans. the point is to reduce power to reduce alternator load to increase fuel economy :-) problem is I need 12 bulbs. so with single 1 watt LED's thats 12 watts or just slightly more power than a single nav light and almost HALF the power of a single brake or turn signal bulb. IE huge power reduction. but they take 2v each :-)