question is how many weeks of 24 light before giving a 18/6 light schedule ?

they are currently in day 15 and have alot of leaves but are not very tall ? only tap water and some rain water is all they have been fed . they were back filled when they came up leggy . They look healthy to me but just not very tall, ill put some pics up and please give your thoughts about a light schedule and the condition on my seedlings . thanks

There is no rule for this because most growers don't even bother with 24 hours of light. I haven't been able to find any reliable evidence that states there is any benefit to keeping cannabis under 24 hours of light.

What kind of lights you using?
Color temp ?

I use t5 to start seedlings and also for clones, mine run 24/7.

You can run 18/6 when ever you like.

Edit pics?

yes pics coming. the seedlings are pink kush and guerilla glue , im starting them indoors and them planting them outside, right now they are under 8 cfls ( 23w = 1000w 1600 lumens each white light ) with also a phony 1000w amazon light " model NOAH-S " ( 2020 version apparently , true 100 - 125 true watts ) and a 20w grow full sprectrum light from home depot { plants seem to grow nice under it really close , like inches from canopy.} over all added up its 300-330 watt true power, all white light except the home depot light which has some red light in it. they get only tap and rainwater the whole 16 days now from the day they sprouted out of the solo cups. I

TreeFarmerCharlie said:

There is no rule for this because most growers don't even bother with 24 hours of light. I haven't been able to find any reliable evidence that states there is any benefit to keeping cannabis under 24 hours of light.

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Needing the heat from the lamps because you have a constant 52F basement is one very good reason for 24/0 (the excess heat in veg is pumped into my flower tents when they are lights-off)

Mind you, I've always run 24/0. I started out that way, it worked, so I've always stuck with it.

spek9 said:

Needing the heat from the lamps because you have a constant 52F basement is one very good reason for 24/0 (the excess heat in veg is pumped into my flower tents when they are lights-off)

Mind you, I've always run 24/0. I started out that way, it worked, so I've always stuck with it.

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Yes, that would definitely be one benefit. I was more or less talking about no real benefit for growth when all other things are where they should be. I've actually noticed young photo period plants seemed more stressed when I've put them under 24 hours of light when I tried it with some grows last year. I currently have Purple Haze and AK-47 plants in my small tent that have been looking stressed for the last couple of weeks and I realized this weekend that I accidental bumped the switch on the timer so I was stuck on 24/7. My findings are nothing more than a correlation I noticed, though, so there's no scientific basis behind what I'm saying. For all I know it could be that they just wanted more water than I was used to since the light was on all day.