6700k/10000k VS 6700k/6700k? - The Planted Tank Forum
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post #1 of 25 (permalink) Old 08-19-2009, 07:20 PM Thread Starter
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6700k/10000k VS 6700k/6700k?

Need some idea here..
I am planning to setup a 15 gallon tank with a 2x65w (21" CF Bulb) fixture.

Gonna make it a very standard planted tank with carpet plants and rock or wood scape. Maybe some ember tetra and shrimps.

What bulb should I be using here? I alway thought 10000K would be too bluish color for a planted tank, and 6700K would be more natural and better for plants.

However, I just notice ADA lighting mostly come in 8000K, and their lighting usually looks very nice for planted tank.
So...should I stick with 2x6700K or go 6700K/10000K mix? Any recommendation? Is one clearly better than the other in terms of plant growth or appearance?

What are you guys using and what's your experience?
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post #2 of 25 (permalink) Old 08-19-2009, 07:35 PM
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6700/10,000 .... bring different colors out in your plants..

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post #3 of 25 (permalink) Old 08-19-2009, 08:42 PM
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The 10k will bring out the red more i believe, i usualy go with the GE 9325K 21" 55 watt bulb which would work gret with your fixture. I went from using 6700k bulbs to the GE bulb and i notice MUCH better growth faster, more colorful, my sowrds started to produce flowers when they were not before also. I would go with the GE bulb but that just my .02 cents

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post #4 of 25 (permalink) Old 08-19-2009, 09:02 PM Thread Starter
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Originally Posted by josh1604 View Post
The 10k will bring out the red more i believe, i usualy go with the GE 9325K 21" 55 watt bulb which would work gret with your fixture. I went from using 6700k bulbs to the GE bulb and i notice MUCH better growth faster, more colorful, my sowrds started to produce flowers when they were not before also. I would go with the GE bulb but that just my .02 cents
where can you buy GE 9325K (or any other GE bulb?)
I am from canada, and the only places that carry 21" compact fluorescent bulb here are bigals and LFS (coralife, CurrentUSA brand..etc). They go for around $50 each too..

I've checked Homedepot, lowes, rona, and other and home and hardware store, but none of them carry straight pin CF bulb, except for the 13watts one where they use it for desk lamp.
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post #5 of 25 (permalink) Old 08-19-2009, 10:15 PM
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Here is a link for the correct bulb i believe
http://www.drsfostersmith.com/produc...m?pcatid=15381

i am not sure if they ship to canada but i believe they do... and they are only $25 each

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post #6 of 25 (permalink) Old 08-19-2009, 10:24 PM
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i got alot of black beard algae when i use the 10k/6700k bulb alone. i now mix it with 9325k and havent had any problems.

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post #7 of 25 (permalink) Old 08-19-2009, 11:12 PM
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10000K/8800K right here!!i think that combo bring out the best color.


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post #8 of 25 (permalink) Old 08-20-2009, 01:15 AM
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2 x 6,700 would be my recommendation - I used them on my 45. I also use 6,700s on my 150 (3 x 80w). I find that the 10's seem to contribute to algae growth, especially on the anubias leaves. Not trying to change topic or solicit, but I think I have the fixture you will be using for sale on here - you can see the tank I had it over also. If you haven't already purchased your lighting.

Am I missing something here or are you planning on putting 130 watts over 15 gallons?
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post #9 of 25 (permalink) Old 08-20-2009, 01:22 AM
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If you have your Co2 and your ferts worked out you would be able to run those lights just fine. Taking care of algae is just balancing out your ferts, co2, water movement, and lighting period mainly.

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post #10 of 25 (permalink) Old 08-20-2009, 01:26 AM
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Quote:
Originally Posted by MyEdsul View Post
2 x 6,700 would be my recommendation - I used them on my 45. I also use 6,700s on my 150 (3 x 80w). I find that the 10's seem to contribute to algae growth, especially on the anubias leaves. Not trying to change topic or solicit, but I think I have the fixture you will be using for sale on here - you can see the tank I had it over also. If you haven't already purchased your lighting.
I think it all comes down to aesthetics. 2x6700K, 6700/10000K, 9325K or whatever will all give you good plant growth. It just depends on what looks most natural to your eyes. I have 2 6700/10000Ks on my 20g and it looks white to my eyes, but may look blue or red to someone else.

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Am I missing something here or are you planning on putting 130 watts over 15 gallons?
Hehe I noticed that too. I really hope you have pressurized CO2 on this thing. You're gonna need to keep it seriously jacked up high to keep algae growth under control with that much light.

Is it the Coralife fixture you're using? I'd recommend only running one of those bulbs. That'll still give you plenty of light to grow most anything.

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post #11 of 25 (permalink) Old 08-20-2009, 02:57 AM
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Do you have square pin or straight pin bulbs?

I purchased my 9325K straight pin bulbs from LightBulbsDirect.com for $14.20 each plus shipping. That's a good price.

I have this bulb in a 1x65w Coralife Aqualight fixture over a 15g with pressurized CO2. It does a very good job. There is no algae noticeable in this aquarium. It's like algae doesn't like this bulb.

If you like open top aquariums, you may want to consider the flip-up (adjustable) legs for that fixture.

If you have square pin bulbs, here is an adapter to use straight pin bulbs in square pin fixtures.

The 8800K Colorquest aquarium pins bulbs were mentioned. They are very good bulbs too.

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post #12 of 25 (permalink) Old 08-20-2009, 03:44 AM
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Choco,
IMO a tank with just 6700K bulbs is going to look yellow/tan while a 10,000K bulb is going to look alot whiter. Personally I like both, my 29 gallon low tech tank has 2 -6500k bulbs and it looks fine. My 100, 90 and 54 have both a 6700k and 10,000K


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post #13 of 25 (permalink) Old 08-20-2009, 02:20 PM Thread Starter
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Thanks for all the comment guys..!!
The GE 9325K bulb seems like a good choice, but unfortunately, I don't think I can find that locally, and drsfostersmith.com doesn't really ship to Canada.

So I am probably gonna go with a 6700K/10000K mix from all the comments here..
Can someone also tell me if there is any difference between the 55w bulb and 65w tho
They both come in the 21" CF straight pin that should fit my fixture. (Coralife Aqualight Deluxe)
Should I stick with 65watt since the original bulb is 65w? or it doesn't really matter
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post #14 of 25 (permalink) Old 08-20-2009, 05:39 PM
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I would stick with the original 65w


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post #15 of 25 (permalink) Old 08-20-2009, 06:39 PM
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I typically like a warmer look myself, which is the 6700k but the 10,000k does supposedly make reds pop more. I use one 6700k and one 10,000k in my 72 gal tank (T5HO) and the same combo in my 60P tank (CF). It's a great middle-of-the-road combo. On my 60P with the CF lights and I can turn one off then the other and on their own one does seem a tad too yellow and the other a tad too blue and washed out. Together all at once is great. On the other hand go with just one or the other and walk away, come back 10 minutes later and honestly either on their own, without being quickly compared, look really good. Either will grow freshwater plants just fine so it's a matter of personal choice.....

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