Re: Ballast resistor for lights?

Posted by Bob M on September 15, 2004 at 09:44:23 from (165.170.128.65):

In Reply to: Re: Ballast resistor for lights? posted by yellowrosefarm on September 15, 2004 at 05:25:55:

Resistance varies not only with lamp design voltage, but also with lamp wattage (higher wattage = lower resistance). Consequently if both the 6 and 12 volt lamps show the same cold resistance means the 12 volt lamp has twice the wattage rating of the 6 volt lamp.

Now as you discovered you can burn a 6 volt lamp on 12 volts. However it WILL have a very short life on 12 volts, either blackening or burning out completely within a minute or two.

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