Thread: Kobold hmi buzzing

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  1. #1 Kobold hmi buzzing 
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    i have a pair of kobold hmi (400w) that are buzzing even after warm up. The buzz is coming from the head/bulb and not the ballast. Is that normal?
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  2. #2  
    Senior Member Bob Gundu's Avatar
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    Yes some brands of HMI bulbs are louder than others. Perhaps ask the manufacturer what they recommend.
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  3. #3  
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    Yeah probably, does it buzz louder when it starts up before the bulb gets up to temperature?
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    Senior Member Bob Gundu's Avatar
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    Quote Originally Posted by RobMNeilson View Post
    Yeah probably, does it buzz louder when it starts up before the bulb gets up to temperature?
    That’s usually the case with most HMI bulbs.
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  5. #5  
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    Quote Originally Posted by RobMNeilson View Post
    Yeah probably, does it buzz louder when it starts up before the bulb gets up to temperature?
    It does start louder and then gets quieter once its warm. I had a chance to compare to a friends with the same model and mine is noticeably louder. Will probably try a new bulb and see what happens
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