were did you get that mis-information? DJshorts blueberry (the orginal creator of blueberry and the world famous one) is mostly sativa made with a Thai (Sativa) Purple Thai (Sativa), and Afghani Indica (obviously Indica) and Northern Lights used to be a 100% indica, specifically a highly inbreed Afghani. It never became stable like Skunk #1 and around 1978 was crossed multiple times with Skunk #1 and Haze in a attempt to stablize it. So therefore nowadays it isn't a 100% indica, just indica dominant. Northern Lights is primarly used as a crossing partner to provide that furry resin look often associated with potent varieties, but NL tends to have very small resin heads and the length of the stalks. Making it relatively weak compared to other strains.
Also about NL#5 twenty years of selective inbreeding produced this strain. A cross of a Northern Lights male x Thai/ NL female. Meaning that this strain has a little bit more sativa in it.

Theres your history lesson for today kids...any questions?