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Old 08-12-2014, 09:10 PM   #16
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Why not just go to radio shack and grab a couple of the 5 volt regulators for something like $1.00 each.. That drops your 12v down to a regulated 5v.. then hook up a series resistor in front of each bulb as a current limiter.. One regulator is good for 1amp so you should be able to power several bulbs under each regulator.
Now, when your 12 volt battery drops in voltage, the regulator will still put out a steady 5 volts.. Also, when one bulb goes bad, nothing changes.

Cheap and simple..
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Old 08-13-2014, 07:33 AM   #17
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They do make 12 volt version of the bulbs.
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