LED Lighting

[Dazbo666]

Is there a simple formula that can be used to work out what resistor(s) are needed for an LED with a 9v or 12v battery...

I know it's considered a bit "chavvy" but I've been considering fitting some white, forward facing LED lighting to the inside of the fairing infill on the GPZ...

I can get LEDs from my local Maplin, and I'm OK with a soldering iron etc, so was planning to wire the LEDs and a switch and a 9v or 12v battery into a plastic enclosure.

The problem I have is that it's so long since I did this type of work, that I've forgotten how to work out the resistance value..
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1st bike (Sept'06 - May'10) : 1991 GPZ500S / Current bike (since Nov 2009) : 2003 Suzuki Bandit 600N
Word of the day : DILLIGAF

[Jamie S]

Why not get some that have them built in ?

https://search.ebay.co.uk/search/search.dll?sofocus=unknown&sbrftog=1&catref=C6&from=R10&_trksid=m37&satitle=12v+led&sacat=-1%26catref%3DC6&sargn=-1%26saslc%3D3&sadis=200&fpos=ch88aw&sabfmts=1&saobfmts=insif&ga10244=10425&ftrt=1&ftrv=1&saprclo=&saprchi=&fsop=1%26fsoo%3D1&coaction=compare&copagenum=1&coentrypage=search&fgtp=

[Dazbo666]

Cheers for the link. I'll seriously consider that

I would like to do it myself though
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1st bike (Sept'06 - May'10) : 1991 GPZ500S / Current bike (since Nov 2009) : 2003 Suzuki Bandit 600N
Word of the day : DILLIGAF

[teabag]

To work out the resistance you need to know the forward voltage and typical current for the LED you have chosen. The value of resistor is then:

R = (Vbat-Vled)/Iled

So, for a 12V battery, a 1.2V LED needing 20mA (0.02A) the equation is:

R = (12 - 1.2) / 0.02

R = 540 Ohms.

Make sure you wire the LED the right way round!!
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NS125R = 2 years > GSX600F = 7 years > XR125L = 3.5 years > SV650S........and a Citroen Synergie HDI for the kids.

[Fr1g1]

Its quite easy! I have installed two blue LEDs on my NSR. These need 30mA each, therefor I use 470 ohm's resistors.

Here is a simple circuit diagram I have made:
https://img187.imageshack.us/img187/6501/enkeltskjemazg7.jpg

Here is what you need. You can also use contuctortape.
https://img169.imageshack.us/img169/1777/lysdioderna9.jpg

here you can see me testing the LED's with a 9V battery.
https://img169.imageshack.us/img169/5084/222su4.jpg

https://img169.imageshack.us/img169/3451/333zm7.jpg


https://img72.imageshack.us/img72/9039/444pn7.jpg

https://img412.imageshack.us/img412/2405/45mq9.jpg

https://img412.imageshack.us/img412/7249/555rk9.jpg
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FP Honda NSR

[Jamie S]

Go away , Chav.

[feef]

someone's going to get arrested soon

a
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Mudskipper wrote: feef, that is such a beautiful post that it gave me a lady tingle
Windchill calculator - London Bike parking
Blog and stuff - PlentyMoreFish dating

[Dazbo666]

Thanks to teasbag and Fr1g1. That's the calculation that I was looking for.

I used to do this type of work for modding computers etc, but lost loads of my plans etc during a house move.
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1st bike (Sept'06 - May'10) : 1991 GPZ500S / Current bike (since Nov 2009) : 2003 Suzuki Bandit 600N
Word of the day : DILLIGAF

[hmmmnz]

jamie didnt your mother ever tell you, "if your not going to say any thing nice, don't say it at all" or at least be a bit more diplomatic.
as long as its not ridden at night and its just for show i think it looks pritty cool. i wouldnt do it to mine
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the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[Fr1g1]

My father is a policeman, and say it's only illegale to drive with them on, but it's 100 percent leagle to use them when the bike stands still.

My girlfriend as a police as neighbour, and almost every night my bike stand next to his car, with the LED's on. He have seen my bike a thousen times, but haven't said anything.

i'm not sure if this is the same in the US and UK.

Sorry for my bad english:P
____________________
FP Honda NSR

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To take the thread off topic then from this earlier thread of mine. According to ACPO guidelines...

[feef]

I looked into the regulations regarding vehicle lights quite extensively as I was confirming a loophole regarding amber flashing lights on vehicles, and their possible eligability for fitment on a bike for filtering.

Blue lights on a non-emergency vehicle,. on the public highway is illegal, end of story.

a
____________________
Mudskipper wrote: feef, that is such a beautiful post that it gave me a lady tingle
Windchill calculator - London Bike parking
Blog and stuff - PlentyMoreFish dating

[Dazbo666]

Just for the record, I edited my original post slightly to clarify my original plan...
to have forward facing white leds inside the fairing infill (so that the glow shows thru the air intake).

(I realise I'll have to put switch(es) in there so that they can be easily switched off should Mr Plod take offence.)
____________________
1st bike (Sept'06 - May'10) : 1991 GPZ500S / Current bike (since Nov 2009) : 2003 Suzuki Bandit 600N
Word of the day : DILLIGAF

[map]