hello,
This is my first grow, and i have planted AK47 Autoflower's.
I have followed the 20/4 light cycle, but have been using a 600W MH. i believe they have just pre-flowered and are ready for the flower stage. i have a 600W HPS bulb that i will switch to. based on your comment about a 600s Sodium lamp for 18/6, should i have been using a HPS lamp all along?

thanks in advance.
jason