Nice thread, I like the '' taking each problem head on as it arises approach '' I'm a couple of grows a year guy myself and Nirvana Northern Lights was my first grow about ten years ago--- '' First cut is the deepest '' and Ive always had a soft spot ever since for this strain. It turned out OK for me although when I look back I done nothing different than sticking a plant under a light in the attic, and it yielded 3 ounces. You seem to be taking a more scientific approach and with attention to detail you should do well with this grow. Now, ten years later I'm growing Nirvana Northern lights again, just at the seedling stage, Good news for you, if you havnt figured it out for yourself is that NL can take a hell of a lot of abuse before it dies of neglect, once the plants get to be six inches high or thereabouts it would be possible to take the plants outside and have a game of football with the pots and it would still survive. Good luck with this one I'll keep an eye out in here and throw in the odd word of encouragement, although I suspect with the care you are showing here to detail it will turn out fine------------I'll try and find the strain report of mines that ended up on the old OVERGROW sites strainguide, you can still find it online--and post it for your perusal. In the meantime, happy trails and good luck.