least watts needed?

i was wondering how many watts do i need if i just want to grow one plant.
trying to keep it simple. thnaks

minimum of 50w per square ft of grow area

thanks dude

more is always better

Light Requirements of "High Energy" Plants1000 - 5000 luxMin. necessary for life10000 - 15000 luxMin. necessary for consistent but sparse growth20000 - 25000 luxMin. necessary for robust growth 25000 - 30000 luxMax. Efficiency for Sub Tropical varieties25000 - 50000 luxMax. Efficiency for Equatorial varieties

thort this might help ya out abit