I'm using 6500K bulbs. The higher the K rating the more "Blue" is in the
light. 10000k is usually considered marine lighting. I think that most
green plants do fine in 6500K

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ups.com...
I thought that 5000K or 5500K were the proper spectrum for plant tanks.
I've been checking out people's tanks online and they are using
spectrums from 6700K all the way to 9300K. Is there an optimum
spectrum? Right now I'm running a 27 watt 5500K and a 9 watt 5000K
bulbs on my 12 gallon.