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Old 07-19-2002, 01:11 AM   #1
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? on VHO lighting & Clams

I have a 75 gal. reef tank currently I am using 2 48" Super Actinic's and 2 48" Actinic White VHO bulbs with an Ice cap Ballast and end caps. I am considering replacing the Actinic White with the VHO Aquasun bulb.
I am confused with the brightness factor, The Actinic White is 12,000 K and the Aquasun is 10,000 K. Which is brighter the higher or lower number? My second question is also why I am considering the bulb change I would like to place a clam in my tank. My LFS advised me to switch to a stronger VHO bulb or Metal Halide (which I can not afford at this time), Would VHO's be capable of keeping a clam alive, and if so which type of clam would you recommend?

Thanks for any help you can offer
John
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Old 07-19-2002, 07:54 AM   #2
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Quote:
The Actinic White is 12,000 K and the Aquasun is 10,000 K. Which is brighter the higher or lower number?
The K number on the bulbs simply referes to the spectrium that the bulb puts out. The higher the number the whiter the light will be. At some point in the upper Kelvin ratings the bulbs start to appear more blue. I have seen photos of a 20K bulbs and a 10K bulb and the 20 K bulb is much blueer than the 10K bulb. The lower the K rating the more yellow a bulb will appear. A 6700K or a 5500K bulb will appear very yellowish in comparison to a 10K or a 12K bulb.

This does not mean it puts out less or more light but depending on what you want to keep the bulbs Kelvin rating implys the spectrium of the light comming from the bulb concentrates at a specific wave lengh producting more of one color of light vs another. Different items in our reef tanks may act more favorable to specific spectrium of light vs other lights.

We have a photo of a clam on the front page with specifics about how that member lights their tank. Also, there is a rather interesting lighting thread entitled Lighting comparison???
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Old 07-19-2002, 08:25 AM   #3
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This is a link that was given on another lighting thread I thought might be of interest to you. Now this link is comparing MH bulbs but whats important is that you can visually see the different "color" light that different Kelvin rated bulbs produce.

http://www.coralreefecosystems.com/ltg_bulb_color.htm
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Old 07-19-2002, 10:10 AM   #4
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Re: ? on VHO lighting & Clams

Quote:
Originally Posted by EMS503
My second question is also why I am considering the bulb change I would like to place a clam in my tank. My LFS advised me to switch to a stronger VHO bulb or Metal Halide (which I can not afford at this time), Would VHO's be capable of keeping a clam alive, and if so which type of clam would you recommend?

Thanks for any help you can offer
John
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IMO, clams should not be attempted unless you have MH lighting. With this size tank, 2-250 watt MH's would be considered minimum, and most people with experience keeping clams would suggest using 2-400 watt MH's.
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Old 07-19-2002, 02:16 PM   #5
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I think a Squamosa would do well in your tank with either of those lighting configurations as long as the bulbs are not too old. I've found the Actinic/AquaSun combinitation works best for me. The AquaSuns also last twice as long (2 years) as the ActinicWhite (1year). I also replace my actinics every year and I stagger all bulb replacements throughout the year.

As far as color temp... think about heating a piece of Titanium. At 1000 degrees Kelvin (1000K) it looks normal. At 2000K it has a dull red look, 3000K orange, 4000K yellow... etc. Until you get to 12,000K where it's bright white and slowly progresses toward blue above 15,000K.

20,000K is the highest value on this scale. Actinic light is considered to have an Infinate K value.
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Old 07-19-2002, 08:08 PM   #6
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I agree with Guy on this one, I have successfully kept T. Crocea and T. Maxima and T. derasa in tanks with VHO lighting, but I would not recommend those for VHO users. T. squamosa is a clam that is found in deeper waters and doesn't require as much light as the others mentioned above.
As for my success with those clams, I attribute it to the fact that the T. crocea was a small specimen when I aquired it and it was moved to a tank with more VHO lighting within a year. The T. maximas and the T. derasa were placed in the second tank from the beginning.
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Old 07-26-2002, 02:13 AM   #7
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I have to agree with everyone's suggestion of a squamosa. I too have a 75 lit solely by VHO's. I've had mine for over a year and he has easily doubled in size. He sits on the sandbad.

I'd love to have a crocea or maxima, but I just don't think it's a great idea.

HTH,
Stephanie
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Old 07-26-2002, 09:41 AM   #8
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In my curosity as to if I could keep a clam with my lighting in the new 80 gal

I went searching on the net for the squamosa clams. In my search I found this page with a nice photo of a green squamosa. From what I understand there colors will and can range from brown, green, yello and blue.

Plus there is a funny little photo essay on the adventures of "Diver Dan". Its some funny stuff done by obviouslyi a reefaholic.

http://www.usinternet.com/users/dsapp/
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Old 07-26-2002, 11:29 AM   #9
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Look at www.liveaquaria.com and they will have pictures of that type of clam as well.

I have a deresa that did well under 2 65w PC smartlamps in my 75. i forget the exact comparisions, but should be close. i would not try a maxima under anything other than a MH nor would i try croceas.

just my 2 cents
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Old 07-26-2002, 10:04 PM   #10
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Squamosa

These are my two Squamosa. The left has been in the tank for about a year and was tiny when I got it. The right I received in a trade a few months ago. Both are growing rapidly.

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