I have not read one post that tells the true story of what we call the veg cycle! So let me be the one to offer this as old news, You are not in veg cycle until your seedlings are at least 2 weeks or so old from sprout how do you count a a seedling as vegging?
"So here it goes for new and old growers"
Germ the seed: 1 to 6 days
Plant the sed and wait for sprout: 1 to 3 days
Let seedling grow to at least the third true Node! 14 days or so depending on type of growing method this for soil, & to 10 days for dwc hydro and or waterfarm!
So when you say 30 days veg and you are counting from the early seedling stage your actuall veg time is a lot less then you would believe..
At this stage your veg time is more on the 16 day side then it is the 30 day we think...
By the way i cant explain it but i have tried 12/12 from seed as with the same way my man del does and it works very well but as he said not all are golden you will have some that dont pan out for one reason of another but you can get that result even with veg time, different strains Phenos lights heat nutrients etc.etc.
So its all about trial and error one way or another! Iread another thread that swears by the light schedule that more closely resembles the actual sun for lights on and off and he will grow no other way and has great results his way and believe me i will be trying this as i have a loot of other things here that makes some sence to me! so Good luck and happy growing i hope you reach your goals..My next grow ill be doing the sun schedule going 13/11 for the first 45 to 60 days of the plants life and then going 11/13 throughout flowering...