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PostPosted: Tue Mar 03, 2009 2:33 pm 
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If I use a T-5, 4 bulbs X 39 watts fixture, what would be the best bulb combination over a 30gallon planted tank? I'm assuming actinics don't do anything for the plants except maybe give the tankl some color. Would I want all 6700K bulbs or is it best to mix them up with, perhaps, a T-5 "plant grow fluorescent," bulb, which I understand accentuates blue and red. Appreciate your input.


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PostPosted: Wed Mar 04, 2009 12:19 pm 
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You've got plenty of watts per gallon, so that's good (in fact, pretty high). You are right that actinics wouldn't do much. They're more for reef systems, whereas chlorophyll doesn't much use those wavelengths. At lower K values, a lot of it is aesthetics, rather than what the plants care about. It's important to have full-spectrum bulbs, though. In my opinion, the plant-grow types look unattractive, because they make everything look an unnatural pink-purple. (I'm one of those people who also dislike brightly colored gravel.) The 6700 K type look like New England sunlight, and are fine. (6500 K is widely available, and pretty similar, but very slightly yellower and less attractive, in my opinion.) A little bit of bluer light tends to make the tank look cleaner, in my opinion. Personally, I use a 50-50 power compact, with half 6700 K and half 10000 K. If you combine some 10000 K with the 6700's, that will work well and look very nice, in my opinion.

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PostPosted: Wed Mar 04, 2009 11:35 pm 
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Location: Boston
DocJonathan wrote:
You've got plenty of watts per gallon, so that's good (in fact, pretty high). You are right that actinics wouldn't do much. They're more for reef systems, whereas chlorophyll doesn't much use those wavelengths. At lower K values, a lot of it is aesthetics, rather than what the plants care about. It's important to have full-spectrum bulbs, though. In my opinion, the plant-grow types look unattractive, because they make everything look an unnatural pink-purple. (I'm one of those people who also dislike brightly colored gravel.) The 6700 K type look like New England sunlight, and are fine. (6500 K is widely available, and pretty similar, but very slightly yellower and less attractive, in my opinion.) A little bit of bluer light tends to make the tank look cleaner, in my opinion. Personally, I use a 50-50 power compact, with half 6700 K and half 10000 K. If you combine some 10000 K with the 6700's, that will work well and look very nice, in my opinion.


Ditto

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Rich
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Part-time fishguy at Uncle Ned's Fish Factory (saturdays)
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Species I am currently keeping/breeding include :
Copadichromis borleyi "redfin"
Labidochromis caeruleus yellow labs
Aulonocara sp. "Lwanda"
Ancistrus cf. cirrhosus "Super Red Ancistris"
Xiphophorus montezumae Montezuma Swordtails
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(I'm in the middle of resetting and redesigning my fishroom - so things are kinda quiet)


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PostPosted: Thu Mar 05, 2009 10:53 am 
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Thank-you. I was thinking alonmg those same lines.


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PostPosted: Thu Mar 05, 2009 12:18 pm 
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With that much light you may want to consider some CO2 injection.

-- Dave

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PostPosted: Thu Mar 05, 2009 4:42 pm 
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Dave,

I have some Co2 going in. One of those fermentation (with power head) jobs. Hoping its enough.


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