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Thread: Why has my bulb exploded!?

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    Exclamation Answered: Why has my bulb exploded!?

    This is my first ever grow, im 3 weeks in and my 250 watt mh bulb seems to have exploded on the inside leaving a massive bulge on the outer shell!!!

    ive ordered a new one but can someone please tell me why this has happend i cleaned the bulb with a cloth before applying and have pretty much done everything by the book.

    also, ive had to replace it with my 250 watt hps until the new one arrives so ive raised the reflector a few inches and now giving the plant 6 hours of darkness instead of 4. the bottom leaves have already gone almost completely yellow and other leaves are beginning to look crispy on the edges as well..

    please help me?

  2. "You shouldnt use a cloth of any kind you should pull the bulb out a few inches by the fixing and then use the cardboard to screw it into the fitting no need to touch the bulb at all"


  3. Default

    Quote Originally Posted by Chronic the Hedgehog View Post
    This is my first ever grow, im 3 weeks in and my 250 watt mh bulb seems to have exploded on the inside leaving a massive bulge on the outer shell!!!

    ive ordered a new one but can someone please tell me why this has happend i cleaned the bulb with a cloth before applying and have pretty much done everything by the book.

    also, ive had to replace it with my 250 watt hps until the new one arrives so ive raised the reflector a few inches and now giving the plant 6 hours of darkness instead of 4. the bottom leaves have already gone almost completely yellow and other leaves are beginning to look crispy on the edges as well..

    please help me?
    dont no what could of happend your light, it may have been damage in the post or something.
    there should'nt be any real diffrents with heat from a mh and hps, your leafs going yellow sounds like they need more food.
    you could maybe put up a few pics.
    good luck

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    Could any moisture have reached it ie; from misting your plants? Moisture and HID don't mix
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    yeah could have been a slight knock on the bulb and the yellowing as LBN says could be lack of nutes..
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  7. #5
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    You shouldnt use a cloth of any kind you should pull the bulb out a few inches by the fixing and then use the cardboard to screw it into the fitting no need to touch the bulb at all

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    Adambomb (19-04-12), babybud3232 (19-04-12), TheDukeof420 (24-04-12)

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    Quote Originally Posted by Icon View Post
    You shouldnt use a cloth of any kind you should pull the bulb out a few inches by the fixing and then use the cardboard to screw it into the fitting no need to touch the bulb at all
    You learn something new everyday

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  11. #7
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    Could it be that it thought you were working for the US/UK government and it was a Islamist light?

    Does the ballast match the bulb - 250w bulb but you don't mention the ballast.

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  13. #8
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    Not sure why you have moved it away either the MH is hotter then the HPS w for w so it should be fine where it is

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    I am not sure of the specifics but heard if an HPS bulb breaks, it releases Mercury. Certainly this is in gas form but may also be in liquid/solid form. You may want to use caution and investigate this further?

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    It don't sound good.I clean mine with alchol after I put it in to be safe. Oil what so ever gets on it and that the end of it shortly after you turn it on

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    Mabe somebody touched it while you not looking

  17. #12
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    I have used a few that have had finger prints on and not had a problem so i think its just a case of bad luck in this instance.
    I have touched a few with sweaty heads as well without incident so although im not encouraging any one to be anything then clinical with them i wouldnt want everyone panicking at the slightest little thing
    They are generally quite resilient things.

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    bulbs blow, if the next one is ok, its just one of these things,

    if you havent splashed water on it that is, they dont like a drop of cold water on them one bit!

    or so they say, left finger prints on it many say that can damage them as well, although ive fingered them with no bad results

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    Quote Originally Posted by Chronic the Hedgehog View Post
    This is my first ever grow, im 3 weeks in and my 250 watt mh bulb seems to have exploded on the inside leaving a massive bulge on the outer shell!!!

    ive ordered a new one but can someone please tell me why this has happend i cleaned the bulb with a cloth before applying and have pretty much done everything by the book.

    also, ive had to replace it with my 250 watt hps until the new one arrives so ive raised the reflector a few inches and now giving the plant 6 hours of darkness instead of 4. the bottom leaves have already gone almost completely yellow and other leaves are beginning to look crispy on the edges as well..

    please help me?


    Silly question have you used the same ballast? Does your ballast not only run 250w only but does it run both mh and hps assuming your using the same ballast?
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    ok, ive just received my new mh bulb and it broke after about 18 hours!! i was extra careful this time and didnt even touch the bulb during application (i used a dish cloth).
    Im pretty sure no moisture is reaching the bulb and yes its a 400 watt ballast and fits both mh and hps. I asked charlie at charlies hydro before purchasing the ballast and he sed this setup should work perfectly aswell as leave a little room if i decide to switch to 400 watt bulbs.
    ive sent the bulb back and should be receiving a new one in a few days so i will keep all updated.
    and yes the yellowing of the leaves was due to lack of nutrients.. ive applied the required amount of canna nutes to my res but was wondering how often i should add fresh nutes as my EC meter hasnt arrived yet (thats what i get for buying from hong kong) also, i only want to be replacing my res water after every harvest so have gone and bought myself a 3.5 watt air pump to keep the water fresh and oxygen charged.
    sorry if i sound a bit noobish any help would be wickedd

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    400 watt ballast
    and,

    250 watt bulb

    bells are ringing!
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  24. #17

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    +1 for Katy

    400W Ballast needs a 400W Bulb

    Unless it's a digital dimmable ballast then you could possibly just about get away with using the wrong bulb
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    Quote Originally Posted by ><{{{*>MiK<*}}}>< View Post
    +1 for Katy

    400W Ballast needs a 400W Bulb

    Unless it's a digital dimmable ballast then you could possibly just about get away with using the wrong bulb
    Even with a dimmable ballast, I would still not use a lower rated bulb with it, I feel it is just asking for trouble.
    Use 400W bulbs fella.
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  26. #19
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    Bulbs fail and when they do they do it it's not a good thing, I was looking for a bulb not long ago and it was showing how bulbs explode and fail, as long as the out side glass doesn't brake your ok, but if a bulb brakes all the way then the grow room needs to be vented and cleaned after it's vented and is some what to clean it.

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    you need a new ballast, and let me guess the guy at the grow shop said "its a little more expensive, but its better and you can go to a better bulb" he's either incompetent or screwed you for a few extra quid

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