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Results 1 to 6 of 6
  1. #1

    Join Date
    Feb 2010
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    Default dead T5 - normal?


    0 Not allowed!
    One of my coralife dual-T5 light fixtures is not turning on. Not too surprising, since I've been running those bulbs 8 hours a day for 4 years. It when I turn it off (and let it wait for a while) and then back in again, one of the bulbs in the fixture turns on but the other one doesn't. So probably that one's burned out.

    Here's something a bit odd. The coralife fixture has a clear plastic shield below the bulbs. That plastic piece, near one of the ends of the bad bulb, has a bulge in it. This suggests that the dead bulb got so hot that it started to melt the plastic before it died.

    My question is this - Is this a typical behavior for a dying t5 light bulb, or maybe a sign that something is wrong with the fixture itself?
    300 gallon mega tank: sailfin pleco, clown loaches, silver dollars, roseline sharks, congo tetras, new world cichlids
    125 gallon office tank: Africian cichlids, synodontis catfih
    75 gallon community tank: bolivian rams, black skirt tetras, dwarf neon rainbowfish, corys, harlequin rasboras, otos, bristlenose and bulldog plecos, assassin snails, various shrimp
    60 gallon goldfish tank: fancy goldfish

  2. #2

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    Default


    0 Not allowed!
    I had that happen once. The bulb even got black(ish) at the same end

    Not to sure if that is typical or not. It only even happened once to me. After replacing the old bulb with a new one, it never happened again. But then again, I only use that fixture on my 40 gallon when I need a larger QT tank
    If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease.
    "Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony Calfo
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  3. #3

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    Default


    0 Not allowed!
    yup, got some new bulbs for that fixture and it lit right up. And wow, those bulbs are now a LOT brighter than the other fixture. I know there's a lot of debate about how often you should replace them, and there's no question that they've dimmed over time.
    300 gallon mega tank: sailfin pleco, clown loaches, silver dollars, roseline sharks, congo tetras, new world cichlids
    125 gallon office tank: Africian cichlids, synodontis catfih
    75 gallon community tank: bolivian rams, black skirt tetras, dwarf neon rainbowfish, corys, harlequin rasboras, otos, bristlenose and bulldog plecos, assassin snails, various shrimp
    60 gallon goldfish tank: fancy goldfish

  4. #4

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    Default


    0 Not allowed!
    While some people recommend replacing t5s once they burn out, I've definitely noticed a difference in brightness after a single year of use.

  5. #5

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    Default


    0 Not allowed!
    I don't know if you know but t5 bulbs loose their spectrum for growth around 8months, if that for most bulbs. I'm surprised you got 8years. I'm not surprised it burnt plastic, it probably got very hot after a few years... Those old coralife fixtures really nuke the high outputs that are expired.

  6. #6

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    Cancer - Epilepsy - Foster Care - Gynecological Cancer - Rett Syndrome - Brhino   

    Default


    0 Not allowed!
    Quote Originally Posted by James` View Post
    I don't know if you know but t5 bulbs loose their spectrum for growth around 8months
    I've heard that, or variations thereof. I've heard as little as 6 months, or up to twelve months or longer, or some people say they run them until they burn out and don't have problems. I'd be interested to see if anyone's done any actual proper long-term spectroscopy.
    300 gallon mega tank: sailfin pleco, clown loaches, silver dollars, roseline sharks, congo tetras, new world cichlids
    125 gallon office tank: Africian cichlids, synodontis catfih
    75 gallon community tank: bolivian rams, black skirt tetras, dwarf neon rainbowfish, corys, harlequin rasboras, otos, bristlenose and bulldog plecos, assassin snails, various shrimp
    60 gallon goldfish tank: fancy goldfish

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