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    Sohaibsoby's Avatar
    Sohaibsoby Posts: 1, Reputation: 1
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    #1

    Sep 11, 2012, 09:08 PM
    how calculate of ballast wattage
    How calculate ballast in 400W bulb? Means that 400W + ballast Watt =?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Sep 12, 2012, 05:23 AM
    Find the manufacturers datasheet of the ballasts you have or want, it will list the total load in watts for both lamp and ballast.
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