It will light up 1.5x1.5 - 2x2 in flower. SO yeah its enough for one plant if you try and keep it within that footprint.
I would train it to best suit those dimensions.
GPW is a bit of a daft metric but 1.2-1.7 is fairly common, lots claim 2gpw but rare I see one that's legit 2gpw, it is possible though.