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lightbulb lifespan and issues?

Discussion in 'Lighting' started by ccLansman, Nov 22, 2008.

  1. ccLansman

    ccLansman Guru Class Expert

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    Just wanted to check, i have had a set of CF bulbs for over a year now and they are starting to turn brown on the plastic part and the light is a lot duller then it used to be. As the bulbs get older do they become less effective? Is it bad to have old CF bulbs? I don't really have an algae problem anymore but have heard that old bulbs can lead to increased algae growth, any truth to this?
     
  2. tedr108

    tedr108 Lifetime Charter Member
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    I have read in several places that yearly replacement of bulbs is recommended. A bulb's effectiveness decreases before the bulb burns out completely, so I wouldn't wait for that.

    If the decreased bulb effectiveness hampered plant growth, I guess it's possible that algae could benefit from that.
     
  3. Mooner

    Mooner Lifetime Charter Member
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    I've seen PC's diminish as early as six months (PAR readings)(anyone else tracking their lighting?). I've also ran them for a year and up to complete burn out. IME the tanks adjust to the lower light levels/slower growth. One things for sure, when you replace these old bulbs the system will go through a shock (ie more intense light/new bulbs)
     
  4. Gerryd

    Gerryd Plant Guru Team
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    Hi,

    No matter what type of lighting I used, I replaced my bulbs between 6-12 months old at most.

    When I used normal flouros, every 6 months.

    That way there is not as much variation in the growth due to the diminished light.

    I would definitely replace them and expect to increase c02/nutrients in response to the increased light.
     
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