Power= volt/current
3=6/2
2 amp
as an led ha to have its current limited to say 10ma then you would need 200 leds
if you used 1 resister to limit the current it would be have to be
a 2.2 ohm 3w resistor and would get hot due to the loading
if you used 1 resistor per led then it would have to be
4400 ohms 1/3w resistor, 200 of these
If you are thinking of using thi idea for a car bulb, then the wattage i different, most led brake bulds say only consume say 80ma, but use high intensity leds.
BUT, if you car is intelligent and has bulb failure indicator, then you may need a ballast resistor to work in parallel to draw more current to fool the car sensor.
regard
j
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