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High power LEDs from 12vdc

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Howsit guys,
Need some advice from someone with some electrical engineering, LED wiring knowledge.

I have purchased some high power 3w LEDs off the net, they run on between 2.5-3v. I need to know how to wire them up in order to run them from the cigarette lighter point which is 12vdc.

send me a diagram, pointers etc.

If I connect them straight up, they will pop as they cant handle the high current(12vdc), so can I simply wire in a resistor?
I have 6x 3w LEDs, and I need to wire them in 2 "banks"/"clusters", basically 3 and 3, so do I need a resistor between the cigarette plug and the leds or one in between each of the leds?

Can I buy a 12vdc LED driver?

Help guys....please.

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