Hey, my name is kaizer59. I'm currently growing Northern Light auto, and I'm in my 3rd week of growth. I wanted to know when I should change my bulb for flowering? Thanks!
as soon as you start seeing the flowers appear, right before the buds start.
with an auto you should start seeing some thing in or around the 4th-5th week, this is when you change to the other bulb.
hope that helps