Can you tell me if this is the wrong light for my tank. I recently
bought a Power-Glo 18,000K 30Lux 8W light for a 6gal eclipse tank that
I'd like to grow plants in. As I do more research I've notice that
this might not be the right light for growing plants (or for keeping
the guppies happy either). It look like it has plenty in the blue
spectrum range, but not enough in the red spectrum for any significant
plant growth.

As far as plants, I'm sticking to low light plants because I can only
fit an 8W bulb in the 12" fixture that came with the eclipse unit.
Java Ferns, Crypts (red wentii), and anubais.

I know the 8W is a bit small to grow plants, but I must deal with it as
part of the Eclipse unit.

Do you think I should change to a 5,000K - 6,000K rated bulb? Does the
K even matter for plant growth or is that a rating of lamp color
visible to the human eye. From what I've read, it's more about the red
and blue spectrum that the human eye can't see anyway.

Thanks for any help you can give.