I think it's poorly thought out, there are a lot of unknown unknowns, what if you get males, what if some shit goes down and people get into your house, fire, burglary, your friend slipping and bringing someone over that doesn't need to know? What if your friend doesn't treat them well, or forgets? Also if you leave it up to normal light and expect to be back in December your plant will have gone over its peak harvest period by then grown with natural light.