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Old 07-20-2006, 10:06 PM   #1
Robert95z
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Question Wiring LEDs, help!

Trying to wire 6 leds in series. Basically i cant figure out how to wire a running light and brake light. I can do one or the other but i cant figure out both. How does running lights work on a bike, is there a resistor that makes the voltage less making the lights dimmer? Then the brake like is straight power making them brighter again?

Cant figure this out. If I ground the LEDs and put the power wire on the running lights wire, the LEDs are lit. But when i put them on the brake power wire, they light but they are no brighter than the running light power wire. Get it? Need help! My bikes stuck in the garage because of no brake lights, help me geebus!
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Old 07-20-2006, 10:07 PM   #2
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run them in parralell...
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Old 07-20-2006, 10:12 PM   #3
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How is that going to work refering to running and brake lights? explain a little please
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Old 07-20-2006, 10:16 PM   #4
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What makes a running light run at low intensity and what makes a brake light work at high intensity?
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Old 07-20-2006, 11:44 PM   #5
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you may need a resistor or new relay so that the power received to the LED's is regulated. what bike is this? did you buy a kit with the relays already included or are you making one yourself?
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Old 07-21-2006, 12:05 AM   #6
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im making one myself, i finished soldering and went to test it on my bike, f4i. Guess i need some kind of voltage regulator. I tested the LEDs on the running light wires, and tested the LEDs on the brake light wires, Both illumante at the same intensity. I cant figure out what size resistor i will need. Specs for the LEDs im using http://www.superbrightleds.com/specs/r3_specs.htm
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Old 07-21-2006, 12:24 AM   #7
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check out the kits on ebay and look at what size resistor/relay/fuse they use in the kit they sell. LED's arent like lightbulbs where you can make anything to your liking and have it work, but maybe if you look on some f4i forums or honda oriented boards you can get a better answer and sooner.
good luck!
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Old 07-21-2006, 12:54 AM   #8
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do you have the wiring diagram for it? im probably just dumb ( dont even say anything ricky) but if you have a power wire for the allways on and one for when you pull in the brake, shouldnt you just have to set 3 of the lights to allways on then have the other 3 turn on when use the brake?
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Old 07-21-2006, 07:39 AM   #9
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It sounds like you are trying to make an L.E.D. be both a running light and a brake light. Taillights are typically dual filament, 1 wattage for running and one for brake.
Most L.E.D.'s are single filament. Although you could wire in a resistor and diode to make them dimmer while they are running lights, they would be pretty dim. Without knowing the specs on your L.E.D's it's hard to suggest what ohm resistance you'll need.
If you're just trying to rig up something, buy 2 L.E.D. strips and wire one as a brake light and the other as a running light.
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Old 07-21-2006, 08:29 AM   #10
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Patrick, here are the specs of the LEDs im using. http://www.superbrightleds.com/specs/r3_specs.htm

I have 6 LEDs in series on a 12v power source, so thats 2v each right? What would it take for the LEDs to run at 1.5v?
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Old 07-21-2006, 11:03 AM   #11
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I&EE here (Instrument and Electrical Engineer)
First off, you need to run those LEDs in parallel. IE + to + and - to - not + to - (Series). Think of it as a ladder. The two sides of the ladder are the battery voltage and the rungs of the ladder are the LEDs. You start pushing the current higher through each LED and you will shorten the life span of the LED. Also if one LED goes south, then the others will go out as well. Remember trying to find out which bulb went out on the xmas lights? Same problem. Also the LEDs will get progressively dimmer the more you put in series cause they will drop the voltage.

So now on the the resistor idea that you have floating around.
Pat is right, Bikes use what they call a dual filament bulb. In that bulb, one filament has a higher resistance and glows brighter when voltage is applied to it. But LEDs have a turn on voltage and an off voltage...they turn on at ~5volts. So dimming them is not a proper way of dealing with them. You have to play a trick with LEDs and this is my suggestion. Put regular LEDs staggered with the superbright LEDs. Hook the Superbright LEDs to the brake lead and the running light to the normal LEDs. Like this:
Code:
   oooooooooo
    oooooooo
      oooooo
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