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Thread: MH lamp in MV luminaire

  1. #1
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    MH lamp in MV luminaire

    I replaced a barn light with a LED luminare at my grandaughers home. When I took the old luminare down, it had a 400 watt MH lamp in a 175 W MV barn light.
    Was working though.
    Works way better now.
    Moderator-Washington State
    Ancora Imparo

  2. #2
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    How do you know it was a 400 watt MH? I can't see that striking, at least not when the lamp ages.

  3. #3
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    It is possible that some bulbs will work with some ballasts.

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    you can put a MH lamp in a MV fixture--wattage for wattage--just don't go the other way--bad things happen
    RichB N7NEC

  5. #5
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    Quote Originally Posted by RichB View Post
    you can put a MH lamp in a MV fixture--wattage for wattage--just don't go the other way--bad things happen

    It depends- most MH probe start ballasts are listed for driving MV or at least were listed so up until the MV ballasts ban.


    Now with pulse start the 4kv pulse might cause some issues though not to bad provided the bulb has not hit end of life.


    MH in a MV will either not strike, strike and extinguish during warm up or one of the two as the lamp ages.

  6. #6
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    mbrooke,

    That's what we saw using MH in our MV fixtures for sign lighting on the hiway--gave a better softer( not as harsh) light that MH and got around the MV lamps--They worked but would start to cycle at about the rated life
    RichB N7NEC

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    Quote Originally Posted by RichB View Post
    mbrooke,

    That's what we saw using MH in our MV fixtures for sign lighting on the hiway--gave a better softer( not as harsh) light that MH and got around the MV lamps--They worked but would start to cycle at about the rated life
    I believe you- CWA ballast by chance?

  8. #8
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    Quote Originally Posted by mbrooke View Post
    I believe you- CWA ballast by chance?
    Dont remember the ballast but they were Holophane fixtures--Sorry bout the long delay in answering!
    RichB N7NEC

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