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oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: August 30, 2010 at 5:10 AM / IP Logged  
For additional light?
What sort of LEDs? What sort of light - warning lights or headlights etc?
For 12V you could might be able to connect 4 LEDs in series without a resistor depending on the LED voltages.
Otherwise connect a resistor in series where the resistance R (Ohms) is V/I where I is the LED current, and V is the voltage you need to drop (say 10-12V for a single 2-4V LED).   (Probably a 1/2W resistor.)
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