Question about Sunlight Supply 400 Watt Hps Sunsystem I Sun Gro Plant Grow Light

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400 watt HPS

I have a 400 watt hps, now the light just went out so i tried a new bulb, it didn't work in it either so it's def the ballast, I need to find out which part went bad, now a 400 watt MH conversion bulb will light up in it a little but the 400 watt HPS won't come on at all. All I hear when I plug it up is a humming coming from the ballast. I mean its only got three parts in it right? So there should be someway to test it. Oh I have a digital multimeter if you could tell me what the settings should be set to on it to test the transformer, ignitor, resistor. Thank you so much for your time and effort in helping me whatever the outcome. Peace :) Roger.

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  • rogerthebull Oct 13, 2008

    I have a 400 watt hps, now the light just went out so i tried a new
    bulb, it didn't work in it either so it's def the ballast, I need to
    find out which part went bad, now a 400 watt MH conversion bulb will
    light up in it a little but the 400 watt HPS won't come on at all. All
    I hear when I plug it up is a humming coming from the ballast. I mean
    its only got three parts in it right? So there should be someway to
    test it. Oh I have a digital
    multimeter if you could tell me what the settings should be set to on
    it to test the transformer, ignitor, resistor. Thank you so much for
    your time and effort in helping me whatever the outcome. Peace :)
    Roger.


  • jonzjan Nov 20, 2008

    I unplugged my 400 w ballast while it was running. I switched timers on the power strip then plugged back up. Immediately I noticed that my bulb was not firing. I have since found out that it was not the bulb, but my ballast. My ballast hums like it is running but no fire. I am currently looking to get it repaired, but I am having no luck.

    Josh


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The ballast may not be the problem. The problem may be the ignitor (starter). If the fixture humms, then the ballast is most likely working. Ballasts (transformers) do not go bad very often.

Posted on Nov 17, 2008

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Roger last time a ballast stopped working on me i simply replaced it on the grounds i might become a fire hazard do you no what i mean they are not that expensive

Posted on Nov 09, 2008

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