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1Ponders,Ok if the are in series then the ball game has changed and I dont no why you would do this unless you want to reduce the light output or ru it on a higher voltage.Ohms law for resistance in this case is R=ExE/W.Thus R=12x12/20 R=7.2 ohmsIf there are 4 globes then total resistance is 28.8 ohms and total current will be 6.68 amps.Thus to light these to full brilliance ohms law E=IxRThus E=6.68x28.8 E=192.384voltsHope this helps.Regards Brenton.
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