If I have been running my Cfls 24/7 and I'm thinking of flowering in two more weeks, should I go to 18/6 for awhile or switch straight to 12/12? After 24 hours of darkness I guess..
Most people don't bother with a transitional light period, it's just not necessary. Just go with 12/12 after a 24 hour dark period.
I use 18/6 to veg for the most part, but recently, i've been wanting short plants, so i'm 12/12 all the way.