how long to run my light 400 watt MH

in my second stage i am in right now my transplanting stage i am 11 days into it just now showing my first set of leaves which makes four total i am running my lights which is a 400 watt mh bulb for around 15 hours a day is that to long just right not enough alos it is 81 temp 37 humidity fans running co2 going nutes and ph all check perfect

18 on- 6 off for veg!!! seed or just cloned = 24 hrs. a day !!

my plants are about 17 days old how many hours on how many off the seeds r just some homegrown seeds from last year this is my first time indoor growing first grow

pros help

once they are rooted you will notice a huge difference in their growth. This is when you switch them from 24/0 to 18/6

leave light on 24 hours or leave it on 18 pick one and stick to it keep times the same once their a foot or two tall switch to 12 on 12 off

^^^ Yep, agree with above posts, run them at least 18 hours a day until flower. Like beardo said, pick a cycle of on/off and stick to it. Bouncing around the photo period wether in veg or flower will increase your chances of a hermie with feminized seeds.

ok thanks guys where i live is a bad ass place to do this just in the states so gta watch my shit close and what i say but this place is where its at cant thank you all enough iwill switch them to 18 hrs until flowering i have had them on 15 for about 2 weeks now just 15 b/c i get home from work around 520 and leave in the morn at 820 just easy that way like to run my stuff when i am home so if anything happens can take care of it i am super happy with indoor growing way way easyier than outdoor tanks again guys