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Discussion Starter · #1 ·
I am planning on starting up a planted tank and have some questions on the lighting.
I think that all plants need light in the wave band of 400nm-700nm and if that is the case then it seem that as long as there is sufficient par then the plants will do good.
I believe that par meters only read the wave bands in the 400nm-700nm range so if that is the case then it shouldnt matter what the color appears to be as long as the par readings are high enough.
I dont like the WPG rule as all the different types of lighting will put out different amounts of useable light.
I would really like to know if what I am thinking is correct or am I way off with my thinking and it wouldnt be the first time :icon_bigg.

Thanks Scott
 

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Discussion Starter · #4 ·
OK then so what I need to keep track of is the par value regardless of the K rating. I say that because I can get almost equal par readings with 14k T-5's as I can with 6.5 K T-5's.
 

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We can select light bulbs by what is most pleasing to look at for each of us, as long as we stay in the general area of 5000-10,000K, and probably even higher. When you first see different color temperature bulbs the aquarium definitely looks different. But, for me, the difference tends to disappear after a few weeks or less. My eyes seem to make all lighted aquariums look about the same, when I see only one tank at a time. I find that odd, and I'm not sure it works that way for everyone, but it does for me.
 

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Discussion Starter · #6 ·
OK thank you everybody. I have been told by a couple people (not here) that anything above 6700 k is useless for plants and I had a hard time believing that. I started doing reef tanks in about 92 and for the last 6-7 years have been trying to learn as much as this simple mind :icon_smil can learn about lighting and when I started thinking about a planted tank I felt if it worked for keeping corals alive and growing good then it should work for a planted tank so thanks for your input.
 

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I do think there's a difference in the wavelengths preferred by SW corals versus FW plants, but in general I think that FW plants can utilize a broader spectrum of light than corals.

I regularly use 18,000k (Hagen Power Glo) bulbs in my fixtures... the more important thing that kelvin rating is what combo of spectrums a bulb provides, and this can be different from brand to brand, even with bulbs of the same K rating.
 
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