Best time to change feed from veg to bloom?

[tywyn]

Im 6 days into flowering on my 5th crop (White Widow) and have had pretty good results so far but obviously I'm looking to improve my results/yield. I'm using 2 autopots and a 400w HPS in a closet/wardrobe, and usually get enough for about 4 months supply (about 5oz) I started floweing about 5 days ago but have not switched the feed from veg to bloom yet like I usaually do at the start of flowering. When is the best time to switch feed?

[LOC NAR1958]

Most of the time you flush a few days when you change light. Then pump the bloom nutes to them. Go ahead and just switch, I usually do. I have seen no real difference.

[Shallow Hal]

i feed a veg feed untill i actually see the buds starting to form then i change , normally about 14 days into 12/12 at this stage i normally change the light to 11/13 .

[tywyn]

Thanks I'll switch the feed 14 days in this time. Haven't heard about 11/13 before though, are you saying the yield is increased with this cycle?