How many watts do you need to grow a weed plant?

100 watts minimum per plant prox. 2000 lummens is great but can take more,

up to 100.000 lummens too kill the plant. if you have LED grow light then you will need less Watts like 90watts LED is like 400-600watt MH/HPS vise versa. Buy NASA testet LED grow light or wich thay use. Hmm i think that all. Regards