5000k vs 6500k CFL - The Planted Tank Forum
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post #1 of 18 (permalink) Old 08-29-2013, 06:47 AM Thread Starter
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5000k vs 6500k CFL

Whats going to be the difference as far as plants are concerned with these two? i can get 4 of the 5000k cheaper than 3 of the 6500k but wasnt sure on plant difference and cant seem to find much online as far as what it does to plants!

Thanks!
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post #2 of 18 (permalink) Old 08-29-2013, 07:06 AM
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No real difference; plants will be fine with either bulb.

In the end, use whatever is more visually appealing to yourself (or in this case, whatever is cheaper).

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post #3 of 18 (permalink) Old 08-29-2013, 02:29 PM
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5k is considered as morning light. 6.5k is considered noon-ish light. A bit more intensity

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post #4 of 18 (permalink) Old 08-29-2013, 10:56 PM
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I've had no issues with either...unless you're able to get spectral readouts (very unlikely with standard CFLs) to see where the exact peaks are then the only known difference is how it appears to your eyes.
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post #5 of 18 (permalink) Old 08-29-2013, 11:02 PM
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5000k is more warmer....I like 6500k. It renders the color more accurately. It can be a bit washout.


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post #6 of 18 (permalink) Old 08-30-2013, 04:11 AM
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Quote:
Originally Posted by flight50 View Post
5k is considered as morning light. 6.5k is considered noon-ish light. A bit more intensity
Actually 5000k is closer to afternoon sunlight, morning light is actually between 2000k-3500k.



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post #7 of 18 (permalink) Old 08-30-2013, 04:40 AM
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Get the 6500. If you really want to get all crazy about it you'll find out nothing anywho.
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post #8 of 18 (permalink) Old 08-30-2013, 04:48 AM
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Strangely enough, lower K CFLs produce a tiny bit more PAR.

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post #9 of 18 (permalink) Old 08-30-2013, 04:50 AM
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Strangely enough, lower K CFLs produce a tiny bit more PAR.

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Interesting, what's the rationale? Better reds? Or just something that's been measured?
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post #10 of 18 (permalink) Old 08-30-2013, 05:05 AM
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Measured, there is an older post in a sticky under Lighting comparing PAR of CFLs. Gotta hunt for it.

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post #11 of 18 (permalink) Old 08-30-2013, 05:10 AM
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What are their wattage's and what type of fixture will you be putting them in?
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post #12 of 18 (permalink) Old 08-31-2013, 12:25 AM
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I used to use the 6500k ge barnd bulbs all the time on planted tanks but now I cant fing them anywhere!? I bought some 5000k today at wallymart where I used to buy the 6500 k but that's was 10 years ago so I see they haven't got the 6500k anymore?
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post #13 of 18 (permalink) Old 08-31-2013, 05:02 AM Thread Starter
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Went with the 5000k! Thanks!
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post #14 of 18 (permalink) Old 08-31-2013, 06:58 AM
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Quote:
Originally Posted by aquariumplantsplus View Post
I used to use the 6500k ge barnd bulbs all the time on planted tanks but now I cant fing them anywhere!? I bought some 5000k today at wallymart where I used to buy the 6500 k but that's was 10 years ago so I see they haven't got the 6500k anymore?

I just bought a twin pack of 15w 6500k last Saturday night a Wal-Mart.
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post #15 of 18 (permalink) Old 08-31-2013, 04:28 PM
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Originally Posted by Lornek8 View Post
I just bought a twin pack of 15w 6500k last Saturday night a Wal-Mart.

what brand are they? maybe the walmarts here dont sell them anymore I haven't seen them here in years so I figure ill have to order them online from walmart most likely
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