Rather simplistic of me. You are 100% correct. I was thinking of led's in series running parallel to each other. 3 LED's conected in series, run parallel so that there are a total of nine (for example) three rows three a piece. At the Positive end have all LED's meet and then place a 16 OHM resistor (1 WATT) to a 12V source. n=Negative to ground. You'd pull .9 watts. To keep the voltage in check you could run a POT so the voltage could be controlled. The LED's would be in parallel to the pot but in series to each other. By lowering the voltage you could greatly extend the life of the LED's.