Northern Lights cannabis strain can yield an average of 18 ounces per square meter in a healthy indoor environment. Outdoor Flowering Time, When kept in its preferred West Coast sunny climate, this strain can give a generous harvest. Northern lights have pretty high yields for both indoor and outdoor options. The outdoors yield usually comes out to about 2 to 3 ounces (550 g) per plant While the indoor comes out to about 1 to 2 Ounces per square foot. Is Northern Lights Easy To Grow? With an indoor yield of 18 ounces per square meter and outdoor yield of 22+ ounces per plant, you can get a pretty good amount of bud out of this strain. If growing outdoors, Northern Lights prefers a fairly dry, warm climate and is usually harvested around mid October. Popular Indica Strains: Afghani, Blueberry Kush, Bubba Kush, Death Star.