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light bulb and tannins

I tried asking these questions before but go no response, so I thought
I would try again..

I have 2 questions.  One is about those twisty fluorescent bulbs that
are said to have the brightness of a 75 watt buld but only use 20
watts.  My question is when you are calculation the watts per gallon,
which number do you use?  Are those bad bulbs to use?

Second question: I have some very yellow tanks from the tannins in the

drigtwood I have in my tanks (I have plecos).  I am assuming these
tannins block the light since they make the tanks look a lot darker.
Does anyone have any ideas about getting rid of the tannins or being
able to have plants survive and get enough light in such a tank?