New Grower lighting schedule for seedlings

[krissuk]

can anyone help how much light do i give my seedlings they just popped out of soil today thanx

 

[Trichome farmer]

can anyone help how much light do i give my seedlings they just popped out of soil today thanx

18hrs on and 6 off is pretty standard but you can also give them 24hrs lighting good luck

 

[AutoWonders]

What kind of light?

 

[Simplicio]

I've seen charts that claim to give the correct number of Lux for plants at all stages of growth, but does that really make sense?
Plants that come up outdoors in the spring are subjected to about 12 hrs of very powerful sunlight, often exceeding 100,000 lux, at least for some of the day.
Closer to dawn and dusk, the light will be dimmer, but still very powerful
But I've seen recommendations to give seedlings about 6,000 lux.

It makes sense that you can't suddenly bombard sprouts with too much energy, but maybe if they are given full LED light before they sprout, they'll be able to handle it when they do sprout.
That seems to be what happened to me recently when I decided to start new seeds under full veg+bloom lights.
It was a Platinum p-600 (~325 actual watts) in a 2 x 4 ft tent, and the instructions say not to turn on the bloom switch until late flower.
The seedlings were slow at first, but are now thriving.

In the future I'll plant seeds right in Rapid Rooters already put into the hydro system under 12 hours of full light, and slowly increase hours of light to 18 or 20.

I also suspect that the hydro reservoir can have full strength nutes, and the seedling roots will learn how to deal with it when they arrive.
My late planted seedlings were also subjected to that, but I did hedge my bet by hand watering around the sprout stems for a few days to dilute what the new roots were subject to.

 

[Death The Cultivator]

I've seen charts that claim to give the correct number of Lux for plants at all stages of growth, but does that really make sense?
Plants that come up outdoors in the spring are subjected to about 12 hrs of very powerful sunlight, often exceeding 100,000 lux, at least for some of the day.
Closer to dawn and dusk, the light will be dimmer, but still very powerful
But I've seen recommendations to give seedlings about 6,000 lux.

It makes sense that you can't suddenly bombard sprouts with too much energy, but maybe if they are given full LED light before they sprout, they'll be able to handle it when they do sprout.
That seems to be what happened to me recently when I decided to start new seeds under full veg+bloom lights.
It was a Platinum p-600 (~325 actual watts) in a 2 x 4 ft tent, and the instructions say not to turn on the bloom switch until late flower.
The seedlings were slow at first, but are now thriving.

In the future I'll plant seeds right in Rapid Rooters already put into the hydro system under 12 hours of full light, and slowly increase hours of light to 18 or 20.

I also suspect that the hydro reservoir can have full strength nutes, and the seedling roots will learn how to deal with it when they arrive.
My late planted seedlings were also subjected to that, but I did hedge my bet by hand watering around the sprout stems for a few days to dilute what the new roots were subject to.

Plants have a DLI of how much light they need before c02 becomes necessary and even that has a limit. A better option would be starting your seedlings at 14/10 and if you have lights with which PPFD then you could stay at 14/0 for veg and 12/12 for flower. The less efficient the light the more light in a given schedule you would need.

Lux isn't the most efficient way to measure but PPFD.

https://smartgrow.systems/sgs-original-research-on-the-importance-of-daily-light-integral-dli/

@krissuk clones and seedlings very little light until the vegetative period starts and it helps with root development and expansion. More roots more plant

 

[Simplicio]

Plants have a DLI of how much light they need before c02 becomes necessary and even that has a limit. A better option would be starting your seedlings at 14/10 and if you have lights with which PPFD then you could stay at 14/0 for veg and 12/12 for flower. The less efficient the light the more light in a given schedule you would need.
Lux isn't the most efficient way to measure but PPFD.
https://smartgrow.systems/sgs-original-research-on-the-importance-of-daily-light-integral-dli/
@krissuk clones and seedlings very little light until the vegetative period starts and it helps with root development and expansion. More roots more plant

I only grow autoflowers, so 12-12 would only be done to simulate nature for about-to-sprout seeds.

Lux is pretty much proportional to ppfd, which makes lux good for comparison purposes.
Whether ppfd is the best method to rate lights is debatable.
From https://www.google.com/search?q=def...me..69i57j0.8764j1j8&sourceid=chrome&ie=UTF-8
"An abbreviation for photosynthetic photon flux density, PPFD is a measure of the number of photons in the 400-700nm range of the visible light spectrum (photosynthetic active radiation or PAR) that fall on a square meter of target area per second."

If I were in charge of rating lights, I'd penalize them for not matching the sun's spectrum.
The general principle that nature has figured out the best way to use sunlight probably applies.

For example, if two imaginary lights put out the same ppfd, but one of them is far red (700 nm), and the other is far violet (400 nm), the purple light emits 7/4 = 1.75 times as much power, even tho they emit the same number of photons each second.
I'm certain that a lower ppfd full spectrum light would out perform either.

 

[Death The Cultivator]

I only grow autoflowers, so 12-12 would only be done to simulate nature for about-to-sprout seeds.

Lux is pretty much proportional to ppfd, which makes lux good for comparison purposes.
Whether ppfd is the best method to rate lights is debatable.
From https://www.google.com/search?q=def...me..69i57j0.8764j1j8&sourceid=chrome&ie=UTF-8
"An abbreviation for photosynthetic photon flux density, PPFD is a measure of the number of photons in the 400-700nm range of the visible light spectrum (photosynthetic active radiation or PAR) that fall on a square meter of target area per second."

If I were in charge of rating lights, I'd penalize them for not matching the sun's spectrum.
The general principle that nature has figured out the best way to use sunlight probably applies.

For example, if two imaginary lights put out the same ppfd, but one of them is far red (700 nm), and the other is far violet (400 nm), the purple light emits 7/4 = 1.75 times as much power, even tho they emit the same number of photons each second.
I'm certain that a lower ppfd full spectrum light would out perform either.

A lower PPFD is going to be less photons hitting your plants requiring longer lighting periods to satisfy DLI. Then do the cobs have reflectors, lenses, light spread, cri, color temperature, how the cobs are arranged? Lux doesn't give any indication of how much light is hitting the plant that is effective for photosynthesis just how much is visible to the human eye.

https://www.ledgrowlightsdepot.com/pages/par-ppf-ppfd-and-dli-uncovered



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[Eephus]

My week old under a 3500k autocob seems to be loving the 20/4 cycle I have her on right now

 

[krissuk]

What kind of light?

its a viparspectra led 300 actual draw from wall 135 watts

 

[krissuk]

thanx everyone for your help im new to all this and there is so much to learn just 1 more question if anyone can help the watering ive put my seed in final container its sprouted its under a humidity dome do I just spray it or water soil don't want to drown it ty