18000K power-glo or 6700k life-glo?
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18000K power-glo or 6700k life-glo?

This is a discussion on 18000K power-glo or 6700k life-glo? within the Beginner Planted Aquarium forums, part of the Beginner Freshwater Aquarium category; --> These two bulbs cost the same at my lfs, and I have found conflicting accounts on which is better for plants. I bought the ...

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18000K power-glo or 6700k life-glo?
Old 11-14-2010, 08:57 PM   #1
 
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18000K power-glo or 6700k life-glo?

These two bulbs cost the same at my lfs, and I have found conflicting accounts on which is better for plants. I bought the power-glo because I didn't know what to pick, brought it home and found that my tank gets a rosy hue. I kind of like it, but I'm most concerned about the growth of my plants. I only have room for one bulb in my fixture, so I want to know what I should use. Any experience with the Power-glo? does it make your plants grow?
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Old 11-15-2010, 12:19 AM   #2
 
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lights

i like the power glo and the aqua glow...they have nice spectrums and there light output is much higher than the life glo....you may not need the power glo if you dont have light loving plants or a sufficent clean up crew for algaes....
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Old 11-15-2010, 06:39 AM   #3
 
The k rating does not relate to the power of the bulb but to the spectrum of light that it emits. Most plants require light around 6700k for photosynthesis and optimal growth. The high k bulb is not good for plants and could result in an algae problem

Last edited by sik80; 11-15-2010 at 06:42 AM..
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Old 11-15-2010, 10:54 AM   #4
 
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as i stated it produces more light than the life glow and any addition of light output will add to algaes....and as far as my tanks and experience it does fine over my plants....life glo may be more visualy apealing as well but from my observations i like the power and the aqua...
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Old 11-15-2010, 01:00 PM   #5
 
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I have used both of these, and others in this Hagen series (the "...Glo" tubes) and can say without hesitation the absolute best for a planted freshwater aquarium is the Life-Glo or Life-Glo 2 [the former has increased light output due to a special coating on half the tube, the Life-Glo 2 is standard and thus less expensive]. It has the accented red and blue that plants can use best, plus sufficient green to balance for a true rendition of fish and plant colours.

The Power-Glo I had years ago and moved it to my amphibians. I would not use it over a planted fish tank. While the plants may grow, the difficulty with so much "blue" (the higher Kelvin number as someone mentioned indicates this) is that algae can more easily increase. Also, on a purely aesthetic issue, I do not like the purplish glow this and the "aqua" tubes produce. The plants do not look natural, and while the blues and reds on fish may stand out, it is an artificial rendition and other object in the aquarium such as the gravel and wood can take on strange hues. I admit it took me some effort to get used to full spectrum colour rendition (as in the Life-Glo) but I would never change it now.

If you want to save a lot of money, instead of the Life-Glo go to a hardware store and buy full spectrum daylight tubes with a Kelvin around 6500K [the Life-Glo is 6700K]. GE, Phillips and Sylvania all make them, and they are about 1/5 or 1/6 the cost of Life-Glo. They work as well (I have these on some tanks), they look identical, they last as long. Considering that T8 tubes should be replaced every 2-3 years, long-term you can save a lot of money.

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Old 11-15-2010, 08:18 PM   #6
 
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Thanks everyone.
Also, a question Byron, does the ge bulb work the same for a planted tank? Is it exactly the same thing?
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Old 11-16-2010, 11:21 AM   #7
 
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Thanks everyone.
Also, a question Byron, does the ge bulb work the same for a planted tank? Is it exactly the same thing?
In terms of colour rendition, it is as far as I know. I have not myself used the GE fluorescent tube but I do have their compact fluorescent bulbs on my 20g and this tank sits between my 33g and 90g which have Life-Glo 2 and they are all identical in appearance. The CF bulbs have a rating of 6500K.

In fluorescents I currently have Phillips, and formerly had Sylvania; I only went to Phillips because Home Depot now carries Phillips and not Sylvania. I had the Sylvania tubes for some 10 years, and the Phillips now for 2+. Tanks look the same, plants thriving.

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Old 11-19-2010, 11:18 PM   #8
 
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Update: I bought a GE light (for plants and aquariums) at the hardware store and it is so dim! It makes my tank look orange. It's horrible :( I guess I'll take it back. I don't really know what to use now.
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Old 11-20-2010, 01:22 PM   #9
 
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Update: I bought a GE light (for plants and aquariums) at the hardware store and it is so dim! It makes my tank look orange. It's horrible :( I guess I'll take it back. I don't really know what to use now.
That is not the GE tube I suggested. Any tube made for plants or aquariums will be high in red and blue and the tank takes on a hue that can vary from purplish, reddish or orange. And they are not intense lights so there is usually inadequate light.

What I suggested was the "daylight" with a kelvin rating of 6500K. Full spectrum, daylight, daylight deluxe are some of the common names various manufacturers use. The 6500K (or around that, say 6000K to 7000K max) is what you look for.

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Old 11-20-2010, 03:29 PM   #10
 
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Oh my bad. It was the only one there with a label.
Thanks Byron, I'll take it back and look for the other one.
For the record I wasn't blaming you!
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