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Old 12-09-2005, 10:06 PM   #11
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I would change them out ASAP, not sure what kind you have or how many but try and change them out gradually giving the tank a chance to adjust to the new lighting. If you have 5 bulbs change out 2 and a month later change out the other 2 . Something like that. As bulbs get old the color spectrum changes and this can bring on cyno... But you als need to check for phoshphates if you have cyno, it needs fuel.
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Old 12-09-2005, 10:09 PM   #12
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Exactly how does the spectrum change as the bulb gets older? People run everything from 20k bulbs to 6,500 bulbs without issues. How do older bulbs change that makes them cause "problems"
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Old 12-09-2005, 10:14 PM   #13
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That`s a good question but I`ve always been told that also about the spectrum changing. I think it`s got something to do with trhe gas inside of them. I think. We need a lighting expert here.
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Old 12-09-2005, 10:21 PM   #14
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Im no expert , its my understanding that the color that they produce changes to a red spectrum and this helps promote algae growth and is not right color for coral growth.. Maybe Steve S will help out here... Also they lose intensity as they get older. They sell a light meter and it will tell you when you bulbs start to degrade and when its time to change them out. My buddy has one and he says it works out great for him. I have yet to get one. I just go by eye and what the corals look like. You can see when the bulbs get dimmer.... Or maybe it just me...
there is info on line about this I just need to find it again.. My mind is not what it used to be..
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Old 12-09-2005, 10:28 PM   #15
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Let me know more about that meter if you get a chance
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Old 12-09-2005, 10:38 PM   #16
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I about bought a meter a while back. The one I looked at you could submerge the sensor in the tank and a reading at different depths. It was around $300. I just could not justify it for use just on my tank.
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Old 12-09-2005, 10:54 PM   #17
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Found the meter I was looking at.
http://www.apogee-inst.com/pdf_files/qmss.pdf
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Old 12-10-2005, 12:29 AM   #18
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I have PC ligthing and I've started having a problem with cyano that I didn't have before. My tank perameters haven't changed. Is old lighting that much a contributing factor? Could this be my problem?
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