Thats some good work from one plant. I love Northern Lights, first tried it on a trip to Amsterdam about 20 years back, really good stuff. Definetly on my list to grow.
Not bad! 75 days is hella long for an autoflower! My first girl went for 66 days and I got 3.7oz dried, have a second one about to be done that should yield a little more. With some LST and topping you should be able to get a considerable amount more. Lights are probably the number 1 factor in yield. Good job none the less!