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12 v DC 3watt led project Answered

Hello all,

I am looking into an led project for my car.
It involvs using 3w led's and I have no idea on how to "drive" these for 12v dc.
I have looked into led driver's but they are a bit expensive in my opinion so I hope some of you electronic "guru's"
can assist me.
The specs are:
3w yellow led,  forward voltage: 2.9-3.3v,   forward current:  750 mA.
I have a very slight electronic knowledge background (novice at best).
I don't need a heatsink (don't think), as I will have 8 sections with 2 led's per section wired in series and they will be
mounted to an aluminum bar.
The led's will be connect to a chaser light controller circuit.
I just need to know what kind of resistors I need (and/or anything else).
The best way to describe my project is I am making a knight rider light for the front of my car.
I had posted on an electronics forum and got a suggestion to do this. The only problem is it didn't work.

3 Replies

user
gizmo13 (author)2013-04-16

3w yellow led, forward voltage: 2.9-3.3v, forward current: 750 mA.
luxeom star led's I believe

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user
azharz (author)2013-04-15

Can you can give me some more information like how many LED's are and which type of they are.

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user
steveastrouk (author)2013-04-12

Best place for technical answers is here in the community: answers section.

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