6,500K Vs 10,000K - The Planted Tank Forum
 
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post #1 of 12 (permalink) Old 03-07-2005, 12:59 AM Thread Starter
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6,500K Vs 10,000K

I recently upgrade my 10,000K 20watt T12s (2 of them) to 6,500K 75watt T12s (2 of them) to convert my 50g FO tank to planted tank. After doing the upgrade, I noticed some increase in tank brightness, but not 4 times as I expected.

Is 6,500K bulb less bright to eyes that 10,000K? Is that the reason why it does not seem much brighter?

Last edited by pk-sd; 03-07-2005 at 09:17 PM.
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post #2 of 12 (permalink) Old 03-07-2005, 01:21 AM
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Quote:
Originally Posted by pk-sd
I recently upgrade my 10,000K 20watt T12s (2 of them) to 65,000K 75watt T12s (2 of them) to convert my 50g FO tank to planted tank. After doing the upgrade, I noticed some increase in tank brightness, but not 4 times as I expected.

Is 65,000K bulb less bright to eyes that 10,000K? Is that the reason why it does not seem much brighter?
yes, it is less bright to the eye. By the way, its 6,500 K.

do you have 2x75 watts on the tank, or 1x75 watts. Im slightly confused. Many people have found that 6,5000 K is better for plant growth.
How did you get 75 watt T12 bulbs! Jeez!

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post #3 of 12 (permalink) Old 03-07-2005, 01:41 AM
 
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I'm using 2 overdriven (2X) 10,00K and my plants seam to like it just fine. All of them are perling except the Glosso. If I switched to 6500 would my glosso start to perl?
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post #4 of 12 (permalink) Old 03-07-2005, 01:48 AM
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I use a mixture of light spectrums and am getting great growth. 65 watt pc (10,000k:6700k), 15 watt NO 2800k, and 40 watts 6500k screw in CF.

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post #5 of 12 (permalink) Old 03-07-2005, 01:50 AM
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what i meant to say was, plants photosynthesize slightly more efficiently with 6,500 k lights. If your plants are healthy, then you're fine.
As far as i know, glosso doesnt pearl, and i think thats a good thing... if i wanted a carpet of silver reflective bubbles, i'd have gotten riccia

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post #6 of 12 (permalink) Old 03-07-2005, 09:11 PM
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Thanks is right...glosso barely pearls....

If your plants are pearling...then you are fine....

When you change the lighting spectrum...it takes the plants a few days to assimilate to the new lighting conditions...so you might notice algae taking advantage of the fact during this time....


I've noticed the best results with a combo of 10,000k and 6500k...
that way its brighter to the eye as well...

currently Im using all 10000k on the 75gal...a total of 260w...and plants growth is explosive...

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post #7 of 12 (permalink) Old 03-08-2005, 04:37 AM
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Quote:
Originally Posted by Thanks
what i meant to say was, plants photosynthesize slightly more efficiently with 6,500 k lights. If your plants are healthy, then you're fine.
As far as i know, glosso doesnt pearl, and i think thats a good thing... if i wanted a carpet of silver reflective bubbles, i'd have gotten riccia

Plants do not photosynthesize better with 6500K. Plants grow better with bulbs with that peak in the red and blue wavelengths. A 6500K bulb may or may not peak in these areas. Actually the best bulbs I have found for plants hands down are GE Plant & Aquarium bullbs.

BTW: Glosso will pearl. I've seen it.

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post #8 of 12 (permalink) Old 03-08-2005, 07:53 AM
 
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Ditto what Bob said. The K rating is just how the light is perceived by the human eye. You have to look at the graph for the light spectrum for each bulb to find out where it peaks to make an appropriate assessment. Now can we bury this myth?
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post #9 of 12 (permalink) Old 03-08-2005, 03:55 PM Thread Starter
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Quote:
Originally Posted by Overfloater
......Actually the best bulbs I have found for plants hands down are GE Plant & Aquarium bullbs........

So where can I find this GE plant & aquarium T12/24” bulb ?
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post #10 of 12 (permalink) Old 03-08-2005, 04:08 PM
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I know that Lowes sells them at 48 inches, I think they sell other sizes not positive about 24 inch though. Also check out Philips Plant and aquarium bulbs, they are sold at Home Depot.

You might not like them because they look dimmer, and the light produced is pink. But if you mix them with other bulbs the color produced is great.
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post #11 of 12 (permalink) Old 03-08-2005, 04:24 PM Thread Starter
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I have room for one more 24” inside my canopy. I was thinking of adding my 10,000K bulb that I have sitting around. But if I could find this GE bulb, that would be nice…….
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post #12 of 12 (permalink) Old 03-08-2005, 05:50 PM
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Quote:
Originally Posted by Urkevitz
I know that Lowes sells them at 48 inches, I think they sell other sizes not positive about 24 inch though. Also check out Philips Plant and aquarium bulbs, they are sold at Home Depot.

You might not like them because they look dimmer, and the light produced is pink. But if you mix them with other bulbs the color produced is great.
Agreed.. I mix mine 50/50 with 6500K to brighten them up.

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