Minnesota aquatic plants
Posted 05 April 2016 - 08:25 PM
That's not what K means at all. The K value describes the color. Technically, it's the color of light that would be emitted as blackbody radiation by an object of that temperature on the Kelvin scale (Celsius temperature plus 273.15 degrees).
Posted 05 April 2016 - 09:09 PM
15 watts is related to energy use. You are better off paying attention to lumens (if it is listed) for the light output and realize that the light output scale is different from the light color scale. Both the amount of light output (lumens) and the color of the light (Kelvin) are important to growing plants. Like others have mentioned 6700k (kelvin) is your target for freshwater plant growth (for comparison the warm or yellow lights that you may have in your home is probably closer to 3200 - 4000k and the blue-ish lights that you will often see in a saltwater tank often ranges from 10000k to 14000k or even 20000k).
The bulb from Amazon is marked as an Aqueon "full-spectrum daylight" in the title, but the image shows an Aqueon "floramax" so that makes answering your question a challenge. The specs on these bulbs are listed in nm (or nanometer) instead of k (or Kelvin) so it makes the answer to your question a little bit more complicated. The nm and kelvin scales are two different but very loosely related scales. My understanding is the 650nm is roughly comparable to 4000k and 500nm is closer to 6000k (yes, the number in the two scales go opposite directions). It has been suggested that 6000-7000k is best for plant growth and 4000k is better for flowering.
Based on the specs from the Aqueon website the Floramax is strongest around 450nm and has a separate spike at about 640nm (this bulb appears to focus on plant growth with a spike in the flowering zone) as opposed to the Aqueon full spectrum bulb that has a broad range and is strongest toward the 600nm (or more toward the yellow).
Summary: Between those two bulbs, go with the floramax. If both bulbs are the full spectrum daylight the decision is even easier until you can replace it with a 6700k bulb.
Posted 06 April 2016 - 12:24 PM
Posted 21 April 2016 - 12:36 PM
Posted 24 April 2016 - 07:44 AM
Posted 24 April 2016 - 08:14 AM
Water milfoil is easy to distinguish from coontail if you look closely.
Typical water milfoil leaves: http://www.mainevlmp...icatumWhorl.jpg
Each "whorl" has four very regular leaves with a central stem and "fingers" coming off to either side.
Each "whorl" has irregular numbers of irregularly-forking leaves.
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