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  1.     
    #11
    Junior Member

    When do you replace your HPS bulbs?

    great thread and very informative i needed to see something like this thanks all.

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  3.     
    #12
    Senior Member

    When do you replace your HPS bulbs?

    I use a high end photo light meter, set on a 4' stick taking reading in several places and after 6 months of use the light out put is

    one half or less than a new bulb reads.

    So I replace all my bulbs every 6 months ,might be a waste but I DON'T THINK SO

    Daddy

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