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When working with nano tanks, the wpg rule goes out the window. So to answer your question, yes it is considered low lighting. Try to get a bulb around 6500k for the spectrum as it is best for plants (someone please correct me if I'm wrong).
What is your goal for the tank (fast growth/high maintenance, slow growth/low maintenance, or somewhere in between)? Once you have that determined, then you can gauge the amount of watts for the bulb.
What is your goal for the tank (fast growth/high maintenance, slow growth/low maintenance, or somewhere in between)? Once you have that determined, then you can gauge the amount of watts for the bulb.