I've used Hps bulbs from start to finish... What I'm sayin' is I used them during veg as well as flowering.. Just something I was curious about,and I'm sure there are several others that wonder if it were possible... I know it is....
I'm trying some conversion bulbs now.... Just vegging with them to get my cuts stable.. Then after a week I'll swap to the HPS and veg 2 more weeks and then 12/12 here I come..
Ga Grown!