Re: Ballast resistor for lights?

Posted by Doug in OR on September 15, 2004 at 11:10:59 from (159.121.94.198):

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

Cold resistance means very little. As the filament heats up, the resistance goes up greatly. The only real way to know how much resistance a lamp has is by measuring the amps going through the lamp with the proper voltage applied. Divide the amp reading into the applied voltage, and you get the resistance value for that particular lamp. Remember that two lamps in parallel will then give you a total resistance value of one-half your single lamp resistance.

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