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Originally Posted by Kuan
I have one MR-11 6v 15 W Halogen bulb running off a 2900 mAh battery overvolted at 7V.
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Add a rectifier diode in series with the 7v power; it will drop the voltage by 1v so that you don't overstress the 6v bulb.
Radio Shack: 276-1141 3amp 'barrel' rectifier diode.
JimH: missed the
same bulb; thought that there were two different bulbs. But the general formula can be used in any case: if the bulb is the same then R2/R1 = 1. You know that but this is just to clarify for other readers.