At 12 volts DC, any resistor from 150 ohms or larger would be suitable. Obviously, the 150 ohm resistor would probably result in REALLY bright lighting, so I'd be guessing more along the lines of a 1K or so resistor to tone the amount of light down. The whole idea of the multiple LED's is to spread the light evenly, so each one shouldn't be like a miniature sun.
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