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Thread: Metal halide wiring

  1. #17

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    Is there any certain Voltage the timer needs to be?

    Where does the timer go? If before the ballast, and the ballast is 120, then the timer will also need to be the same. Most timers you buy are 24 volts, so in that case, it wont work.

  2. #18

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    If you are referring to the cheap rotary timers that you can buy at walmart to plug lights into then that is fine. Most anything you plug into the wall and has a plug recepticle for your light will work.

    As tim mentioned if it is a specialized timer that you have to wire it may not be compatible.

    keep it simple

    and yes, place the green wire right on the aluminum housing using a small screw or grounding lug.
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  3. #19
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    No, it's not a special timer, just an Ingraham "heavy duty"dial timer. It's just got a 3 prong outlet/inlet (as is needed for the MH powercord). I also have one by GE that accepts grounded 3 prong cords. Here's the details on the back of the Ingraham (which I ran my AC with last summer):

    CAPACITY: 15 Amps; 120 VAC; 60 Hz; 1875 Watts, 1/3 HP Motor; 15 Amps Tungsten

    The GE one is probably the same.

    Do you think this will be OK?

  4. #20
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    Amps is what you need to be concerned with regarding the timer. The ballast will pull alot of amps especially when it is firing the light up. There should be a rating somewhere on the ballast listing how many amps it draws during lighting the bulb and normal running (operating line amps @120v). The timer rating needs to be equal to this or higher. Otherwise you risk burning up the timer and a fire.

    Most likely the 15 amp rating on the timer is fine for a single metal halide ballast. A quick look at the specs on some metal halide ballasts shows 400watt units using about 3.5-4 operating line amps.
    Is that a Nepenthes in your pocket or you just happy to see me?

  5. #21

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    It's good swords.
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  6. #22
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    I just checked, there's nothing on the ballast that mentions Amperage or Volts or anything at all except a label that says Hamilton Technologies and a warning sticker about turning it off before you reach into your aquarium.

    Here's another question, how hot do ballasts run? Are they just warm like a flourescent ballast or way hotter? Since this is the lowland tank a little heat from the ballast and bulb will give me a higher temp (currently it's only 75*Fd/70*Fn) and the old terrarium was 20*F hotter (and twice as bright) during the day and the plants loved it, oozing with nectar. Now no nectar and the latest pitchers are slightly less impressive as compared to the furious growth they had just days before moving them.

  7. #23

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    The more modern, the more effecient, so the less warm. Check this out

    http://www.kalyx.com/store....ile.htm

  8. #24

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    Joachim Danz you are confusing a MH with an HPS, and only a 1000w HPS uses a 4.5kv pulse to ignite the lamp
    400w HPS use a 2.5kv pulse.
    Hes got a 400w MH which only needs an open current of 600v.

    Peace [img]http://www.**********.com/iB_html/non-cgi/emoticons/wink.gif[/img]
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