Quote:
Originally Posted by Christ
So basically, you'd have to ensure a stable 12v signal to the input in order to run enough LED's to not use resistors at all...
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Correct.
If you had a perfectly stable 13.2 volt source you could string six 2.2 volt LED in series with no resistor at all.
The fewer LEDs you have in series and the more resistors you add the wider the input voltage the array can handle without overvolting the LEDs. But you end up consuming more watts with resistors.
4 LEDs in series with one resistor for them will generally offer the best balance between the two.