No it will not work at all. It only has about 400 lumens, that would only be good for seedlings and clones in less that a one square foot area, and at only a few inches above the plants. I have no idea where the 18 sq feet figure comes from, it isn’t really even 14 watts, probably only really 13.8 watts.
Seedlings and clones require about 400-1000 lumens per square foot.
Vegetative growth requires about a minimum of 2,000 to 3,000 lumens per square foot.
Flowering requires about 5,000 to 10,000 lumens per square foot, ideally, and can take possibly much more.
10,000 lumens is supposed to be about the average power of the sun at sea level on a clear day at high noon, or something like that, lol. 8,000 - 12,000 lumens is supposed to be about the average power of the full sun without any overcast or no clouds depending on altitude and potentially other factors.
It’s not ideal, but you can make do with 2,000 lumens for an entire grow if necessary.