I know probably this has been asked before. Please be patient with this newby.
I have a 110 watt Power compact unit with 10,000K bulbs and a 48" strip unit that I can add. I found a 48" NO plant light at lowes to go in the single unit. Will that be enough for my 75 gal? I want med to low light plants that hopefully are fast growers for my first high tech planted tank. Then later maybe I can graduate to more difficult ones.
What you'd have is a low light tank. While there are a number of plants that will do well for you (Crypts, Anubias, Java Fern to name a few) none will grow particularly fast. Even the stem plants that you might be able to keep will grow at a leisurely rate under your 2wpg. Also, unless you have a really good reflector, that 40w NO bulb will contribute very little to your lighting equation.
For fast growth you'll need more light (add another 110w PC fixture), regular fertilization, and CO2 injection. Under these conditions even those plants regarded as slow-pokes can turn into relative speed demons
My concern is algae control. If I heavily plant the tank, I am hoping I can out-compete the algae that will want to grow. My lifestyle would not suit a tank I would have to constantly prune anyway, unless I really get into it. Which has happened in the past.
Who knows, it's a start. Just got to get my hands wet.