You're looking for the right answer but you're asking the wrong question. Like "Homie" said, it's all about sq. ft. A "plant" can be any size from 1/4 sq. ft. to the size of a dining table. It all depends on the "way" you grow it!can anybody please tell me how many light lumens does it take to grow one plant, i know space with light can be an issue but how much does 1 plant need to absorb to grow good quality weed here is a pic of my first grow.