Auto flower is a winner most of the times, yes. Easy and quick.
I dont know about the light for sure but HPS like light would be better for flowering for sure. You are right about the spectrum they get, has something to say. Its not long from flowering now. Couple of weeks maybe and then i go get some more fertilizer since i dont have more. Im looking at BioBizz right now but lets see what time brings.
Do some savings and buy a tent. Then you can control the environments more, or completly.
You can safe money on Wish.com, for light. Dont buy tents there. If they send you the wrong light or even not as described you can get your money back again for free or make them send you what you ordered, but Wish.com is not the best, i know... But its cheap.
Thank you for your time!