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Old 06-16-2009, 12:42 PM   #11
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so theres really no downside to increasing the ratio of actinic: 10,000 k bulbs? besides it looking bluer...
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Old 06-16-2009, 03:57 PM   #12
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I personally think they are needed in the reef tank. I stated my reason above.
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Old 06-16-2009, 05:02 PM   #13
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Quote:
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so theres really no downside to increasing the ratio of actinic: 10,000 k bulbs? besides it looking bluer...
The down side is actinic bulbs have very little PAR. Replacing 10K's with actinics cuts down on total PAR. Depending on the corals you have, it may or may not make any difference in growth.

There are many reefs run with NO ACTINIC lighting. Here's 1 at PSU.


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Old 06-16-2009, 05:46 PM   #14
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Like Mike stated I to believe some actinics are needed in 420-460 range. Yes they don't have as much PAR as a 10k so it all comes down to the simple fact....Does it look good to you...and are you satisfied with the growth of your corals..
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Old 06-16-2009, 05:59 PM   #15
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And I`m not in no way arguing with Larry. He`s one of the best but this is one of those that we have two different opinions which is good for the hobby. If there was one right way to do things we would all be doing it.
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Old 06-16-2009, 07:02 PM   #16
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I know Mike. Not arguing with you either, but it is a fact that a 10K full spectrum bulb has all the blue light needed for photosynthesis....at least if you believe all the research done by Sanjay and his associates. You can see the size of the corals in that PSU reef. It's run on 10K metal halides only. That being said, I do run actinics for the the color (VHO actinic is the best actinic).
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Old 06-17-2009, 01:51 AM   #17
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So VHO actinics...Make sense. Not worrying about penetration since Actinics go deep anyway...just not as strong. So you use it as "eye appeal"?
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Old 06-17-2009, 08:02 AM   #18
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cCapt is correct and actinics have always been used throughout the hobby mainly for aesthetic reasons (drowns out yellowing); however, I believe according to Sanjay some of the highest par halide bulbs these days are in the 14k-20k range which is aesthetically similar to actinics.
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Old 06-17-2009, 09:47 AM   #19
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That being said, I do run actinics for the the color (VHO actinic is the best actinic).
That might be where we are differing at because I`m talking VHO and I guess you are talking MH`s. I have no experience with MH`s. So is what you are saying Larry the same for all lighting or just MH`s?
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Old 06-17-2009, 10:04 AM   #20
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I just gotta say thanks to the OP for starting this thread and thanks to the major participants. I've learned a ton about lighting in this thread and subsequent curiousity induced reading. Keep up the discussions! I'm sure I'm not the only one getting value out of lurking along.
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