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Are they ok for the planted aquarium?

Plants use 6000K to 6500K spectrum. I do believe remembering Frank suggesting a 10000K bulb if the tank is really tall, like 24 inches.

Hi,
The short answer is yes, you could use them.

The long answer is that lights 10,000K and above (yes they
do make them) are designed for Salt Water aquariums that
contain corals and other inverterbrates. They need the
higher temperature bulbs to produce the algae and other
organisms that produce their vibrant colors and foods.

Plants prefer light in the red and blue spectrum. But,
we humans are limited. If we view a tank with just red
light it would resemble a zoo exhibit for nocturnal
creatures, you would not see any colors.. Lights that
are at the low end of the spectrum (reds) are generally
thought of from 5000K and down. Red light is absorbed
within the first few inches of water.
Lights at the higher end of the spectrum
(10,000K and up) tend to give off a bluish
light that also washes out colors (in a fresh water tank).
Blue light penetrates deeper into the water, well beyond
where red is eliminated.

Generally speaking, if you want to see your freshwater fish
and plants where greens are green, and reds, red, use lights
between 6000 and say, 8800K.

If you are concerned about cost, do not buy the so called
"plant friendly" bulbs such as those that start with the
words "Grow." Those bulbs tend to give off light that is
pinkish or purple. Instead, go to your nearest hardware
store and purchase a bulb that is labeled DAYLIGHT or
SUNLIGHT. These bulbs are about 6700K and perfect for your
tank. Don't buy those bulbs labeled "Warm" or Soft" those
are designed for reading and are not as "harsh" for your
eyes, and also not designed to imitate the sun.

Some folks will use a blend of light depending upon how
deep the tank is (show, or tall tanks). They will use
a 6700k and a 10,000k bulb.
Leave your lights on for 10 to 12 hours a day.

Frank


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