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#21
02-04-2008, 01:51 AM
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Light Output of the Phoenix 14,000K DE MH Bulb Over Time
Here's some info for this old thread. I came across this article as I was Googling for Phoenix bulbs. It claims that the MH bulb that is being tested lost around 20% of its output by month 6. By month 12, it has lost 25%. By month 18, it has lost 30% of its output. By month 24, it has lost 34%. By month 27, it has lost 37%.
Light Output of the Phoenix 14,000K DE MH Bulb Over Time http://reefkeeping.com/issues/2007-04/ac/index.php "The light output of the six Phoenix bulbs shows an initial decline over the first three to four months and then levels off at about 75% of their initial output. From these data I raise the question: “If a bulb is not replaced at six months, when it has lost 20% of its output, then why would we replace it at 12 months when its output has fallen only another 6%?” It may be more cost effective to plan the lamp number and placement based on 70-75% of the bulbs' initial output levels. " "this bulb would appear to still maintain 70% of its output at 18 months, 66% at 24 months and 63% at 27 months of use. " Quote:
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#22
02-04-2008, 02:22 AM
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Neal If you ahvea ots of really nice corals then I would switch them out and ensure that you are having the lighting period shorten or have some type of cover like screen to put over the tank with the stronger bulb will bleach some of the tissue in the corals like SPS. I know if you are going to a higher Kelvin bulb then you need to dull the light some how like using screen like I have already stated. If you are going from a lower kelvin bulbs liek 10,000k to a 14,000 or even a 20K then its not as important... HTH but I think that others have posted the same answer or better ones then mine.... 
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180 starfire front, LPS, millipora Doesn't matter how much you have been reading until you take the plunge. You don't know as much as you think.
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#23
02-04-2008, 04:36 AM
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He's using Ice Cap ballasts, this makes for a substantial difference in the bulb's useful life. You may be able to get close to this kind of life with other electronic ballasts but you sure aren't going to get anywhere near it with an HQI. 6 to 9 months with a Pheonix or Aquaconnect on an HQI and it's hosed. They really need to make this point in the article.
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#24
02-05-2008, 03:10 AM
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Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*Some strive to be perfect.... I just strive.
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#25
02-05-2008, 04:11 AM
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So.......I'm running a Giessmann 250W DE fixture with an Icecap ballast and 13K Giessmann bulb and would like it a BIT bluer. I am coming up on the one year mark for the bulbs and am wondering if going to the Giessmann 14.5K is gonna be any noticeable difference or should I go to thier 20K or a different brand completely. I am just kinda scared that the 20K might be TOO blue. There are also 4 actinic T5s in the fixture.
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 38 Gallon Custom Starphire, Remora Pro, 2 Seio 820's, 24" Giesemann Infiniti 1x250W MH + 4x24W T5, 60lbs Live Rock. Last edited by X-Treme; 02-05-2008 at 04:38 AM.
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#26
02-05-2008, 06:02 AM
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Linear Mode
