metal halide wattage question have 175 w fixture, can i use less wattage bulb?

Discussion in 'Reef Fishes' started by john private smith, Nov 16, 2003.

  1. hi folks, i have a fixture thats rated for a 175 watt metal halide
    bulb, but i am wondering if i may place a metal halide bulb of less
    wattage in it, it seems that that would be ok, as long as i didnot go
    in the other direction, say installing a higher wattage bulb. it uses
    a mogul base, and i have seen 70 watt and 100 and 150 watt bulbs, i
    wonder if they will not harm the ballast or themselves,

    thanks
    jack
     
    john private smith, Nov 16, 2003
    #1
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  2. john private smith

    jriegle Guest

    Absolutely not!

    The ballast is designed to deliver a voltage and current for that wattage of
    bulb. You can damage the bulb and/or the ballast.
    John

    "john private smith" <jackofalltrades2001@hotmail.com> wrote in message
    news:b6ef7950.0311151647.2cfa10bb@posting.google.com...
    > hi folks, i have a fixture thats rated for a 175 watt metal halide
    > bulb, but i am wondering if i may place a metal halide bulb of less
    > wattage in it, it seems that that would be ok, as long as i didnot go
    > in the other direction, say installing a higher wattage bulb. it uses
    > a mogul base, and i have seen 70 watt and 100 and 150 watt bulbs, i
    > wonder if they will not harm the ballast or themselves,
    >
    > thanks
    > jack
     
    jriegle, Nov 16, 2003
    #2
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  3. john private smith

    Steve Sells Guest

    If you use a lower rated bulb it will light. Then it will shut off when it
    overheats, then it will re light again, and restart the cycle... after a
    while it will burn out the ballast and the bulb more than likely, I never
    let one run that way for long enough to see first hand.

    Once had an apprentice replace a burned out 175w MH in the warehouse with a
    150 watt bulb, it was funny to watch him try to figure out what was wrong.
    I don't know where the 150w came from, as I had only 175 and 250 fixtures
    in there.

    Steve Sells
    IBEW 305 Electrician, and fish nut


    "john private smith" <jackofalltrades2001@hotmail.com> wrote in message
    news:b6ef7950.0311151647.2cfa10bb@posting.google.com...
    > hi folks, i have a fixture thats rated for a 175 watt metal halide
    > bulb, but i am wondering if i may place a metal halide bulb of less
    > wattage in it, it seems that that would be ok, as long as i didnot go
    > in the other direction, say installing a higher wattage bulb. it uses
    > a mogul base, and i have seen 70 watt and 100 and 150 watt bulbs, i
    > wonder if they will not harm the ballast or themselves,
    >
    > thanks
    > jack
     
    Steve Sells, Nov 16, 2003
    #3
  4. On Sun, 16 Nov 2003 02:45:01 GMT, "Steve Sells" <kyoto@ctlnet.com>
    wrote:

    >If you use a lower rated bulb it will light. Then it will shut off when it
    >overheats, then it will re light again, and restart the cycle... after a
    >while it will burn out the ballast and the bulb more than likely, I never
    >let one run that way for long enough to see first hand.


    Using a MH lamp that is rated for less power than the ballast can lead
    to lamp explosion, fire and perhaps personal injury. DO NOT DO THIS.

    --
    Vic Roberts
    http://www.RobertsResearchInc.com
     
    Victor Roberts, Nov 16, 2003
    #4
  5. On 15 Nov 2003 16:47:13 -0800, jackofalltrades2001@hotmail.com (john
    private smith) wrote:

    >hi folks, i have a fixture thats rated for a 175 watt metal halide
    >bulb, but i am wondering if i may place a metal halide bulb of less
    >wattage in it, it seems that that would be ok, as long as i didnot go
    >in the other direction, say installing a higher wattage bulb. it uses
    >a mogul base, and i have seen 70 watt and 100 and 150 watt bulbs, i
    >wonder if they will not harm the ballast or themselves,


    DO NOT use a lower rated metal halide lamp with your 175 watt metal
    halide ballast. The ballast will try to push the rated current for a
    175 watt MH lamp through the lower rated lamp and, in most cases, will
    overheat the lamp and cause it to explode!

    --
    Vic Roberts
    http://www.RobertsResearchInc.com
     
    Victor Roberts, Nov 16, 2003
    #5
  6. On Sun, 16 Nov 2003 03:44:09 GMT, Victor Roberts
    <Vic@Lighting-Research.com> wrote:

    >On 15 Nov 2003 16:47:13 -0800, jackofalltrades2001@hotmail.com (john
    >private smith) wrote:
    >
    >>hi folks, i have a fixture thats rated for a 175 watt metal halide
    >>bulb, but i am wondering if i may place a metal halide bulb of less
    >>wattage in it, it seems that that would be ok, as long as i didnot go
    >>in the other direction, say installing a higher wattage bulb. it uses
    >>a mogul base, and i have seen 70 watt and 100 and 150 watt bulbs, i
    >>wonder if they will not harm the ballast or themselves,

    >
    >DO NOT use a lower rated metal halide lamp with your 175 watt metal
    >halide ballast. The ballast will try to push the rated current for a
    >175 watt MH lamp through the lower rated lamp and, in most cases, will
    >overheat the lamp and cause it to explode!


    Here is some data on the rated current and voltage of a few MH lamps.

    Lamp Rated Current Nominal Voltage
    175-watt MH 1.5 Amps 132 Volts
    100-watt MH 1.1 Amps 100 Volts
    70-watt MH 0.9 Amps 85 Volts

    Pushing 1.5 Amps through a 100-watt or 70-watt MH lamp will cause
    serious overheating.

    --
    Vic Roberts
    http://www.RobertsResearchInc.com
     
    Victor Roberts, Nov 16, 2003
    #6
  7. john private smith

    Jackson Guest

    Come on people... can you say troll?

    Gotcha!!!

    "Victor Roberts" <Vic@Lighting-Research.com> wrote in message
    news:svtdrv4k1t158q8dehjs7pfqefri0lg1bg@4ax.com...
    On Sun, 16 Nov 2003 03:44:09 GMT, Victor Roberts
    <Vic@Lighting-Research.com> wrote:

    >On 15 Nov 2003 16:47:13 -0800, jackofalltrades2001@hotmail.com (john
    >private smith) wrote:
    >
    >>hi folks, i have a fixture thats rated for a 175 watt metal halide
    >>bulb, but i am wondering if i may place a metal halide bulb of less
    >>wattage in it, it seems that that would be ok, as long as i didnot go
    >>in the other direction, say installing a higher wattage bulb. it uses
    >>a mogul base, and i have seen 70 watt and 100 and 150 watt bulbs, i
    >>wonder if they will not harm the ballast or themselves,

    >
    >DO NOT use a lower rated metal halide lamp with your 175 watt metal
    >halide ballast. The ballast will try to push the rated current for a
    >175 watt MH lamp through the lower rated lamp and, in most cases, will
    >overheat the lamp and cause it to explode!


    Here is some data on the rated current and voltage of a few MH lamps.

    Lamp Rated Current Nominal Voltage
    175-watt MH 1.5 Amps 132 Volts
    100-watt MH 1.1 Amps 100 Volts
    70-watt MH 0.9 Amps 85 Volts

    Pushing 1.5 Amps through a 100-watt or 70-watt MH lamp will cause
    serious overheating.

    --
    Vic Roberts
    http://www.RobertsResearchInc.com
     
    Jackson, Nov 16, 2003
    #7
  8. WOW GUYS THANKS FOR THE EDUCATION!
    i can tell its a bad idea, and i understand why.
    thanks for all your help, i will be replacing the bulb with the same!

    BTW (by the way) what is "TROLL"?

    thanks
    jack
     
    john private smith, Nov 16, 2003
    #8
  9. > BTW (by the way) what is "TROLL"?
    >
    > thanks
    > jack


    A troll is someone who comes in to a messageboard or newsgroup with the sole
    intention of causing trouble. Some trolls make a racist comment and then sit
    back and watch a massive row break out amongst the regular members of the
    group
     
    Grainne Gillespie, Nov 16, 2003
    #9
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