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Will a 150watt hps flower my plant?its 2 months about 2 foot tall.

it should be ok. the lights ideal coverage area is 3 feet of coverage or 50 watts per feet but it depends on if your plant is indica or sativa and the bushiness of it. sativas grow alot more so you could end up with a 6 ft plant technically if dominately sativa.

150 will do it. Just make sure you have the right sized container thats either flat white or lined with mylar