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I have a 2 bulb 4 foot light and it has a 5 wire ballast that needs to be replaced. Can I use an 8 wire ballast? Is this possible?

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  • Jeffery Crow Jul 13, 2010

    this ballast is for an older style t8 bulb so I went ahead and am now looking for a "wired" for 5 wires not 8 any ideas?

  • Jeffery Crow Jul 14, 2010

    YES! I understand. I had not run into a 5 wire before this (just a maintenance MacGyver without a producer) Thanks

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NO you cannot use an 8 Wire to power a 2 bulb, 4 Foot (40 Watts) UNLESS you can configure it to this format below. Each, Output wire should "Drive" one Tube if wired as below, You can drive a 4' from a 8 'or a 6' ballast, but not the converse, the Tube, will only "Draw" as much as it needs. Any unused can simply be taped up and made safe.

I have a 2 bulb - afd2e3b.gif A 5 wire ballast, has One IN, and 4 OUT. an 8 way has One IN and 7 OUT. It is NOT the amount of outputs it is the TYPE of Tube the Ballast can "Drive" For every Foot of Tube, that's 10 Watts, so a 4" Tube is 40 Watts, a 6" Tube, 60 Watts, 8" Tube is 80 Watts. That;s what is critical.
As you can see each tube really has only ONE "Hot" wire, and the Neutral, or return, With the other legs of the Tubes "Filaments" are, connected to the "Starter".

Posted on Jul 13, 2010

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Should not be a problem. The additional wires are for light units with more bulbs. Just make sure the new ballast has the same voltage rating as the old one.

Posted on Jul 12, 2010

  • Bob Korsu
    Bob Korsu Jul 14, 2010

    Make double sure the ballast you plan to use is not for a 240v line. The label on the ballast should indicate this.

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