Re: Ballast resistor for lights?

Posted by Doug in OR on September 14, 2004 at 08:00:02 from (159.121.94.198):

In Reply to: Ballast resistor for lights? posted by yellowrosefarm on September 14, 2004 at 06:57:33:

In theory, you can do it. The reality of it is that you'll need a fairly large resistor. If your lights draw 4 amps at 6 volts, you'll need a 24 watt resistor, minimum. Good Practices Techniques says that you should use a resistor rated at twice that size. A 50 watt resistor is quite large. As for resistor value, you'll probably need something around 2 ohms. This is not the resistance value of a common ignition ballast resistor. Do not take my figures as gospel - measure the current draw with 6 volts applied to your lights and recalculate.

One last item to consider: If you burn out one lamp, all your calculations will be wrong for the remaining lamp. It will get a higher voltage at that point, possibly burning out your remaining lamp.

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