Can anyone give me advice on meauring Led brightness and distance, so on

[Ph 007]

Dam is their anything else to learn init lol, in 2 years if learned so much off this forum it's crazy..

In the past before going into growing with a Bit more science
I would just use hps and all I knew was water temp, room temp and humidit and Google for Hps light distance and e.c and ph
All above was all I new lol ,now i know so much my head hurts

 

[steamroller]

Lux is just another form of light measurement .
PAR rules for plants .
The VPD is part of how the plant survives .
The charts represent levels to keep your plant happiest .
DLI is like a rain gauge for light . It measures how much per daylight cycle .

 

[Ph 007]

Lux is just another form of light measurement .
PAR rules for plants .
The VPD is part of how the plant survives .
The charts represent levels to keep your plant happiest .
DLI is like a rain gauge for light . It measures how much per daylight cycle .

You lost me on DLI , it measures how much per day ligh cycle. I don't under stand that lol.
I know you can pick the hours of lights that your or on 12 or 18
But don't get what you mean or how to use it

 

[steamroller]

Daily Light Integral Daily light integral (DLI) is the amount of PAR received each day as a function of light intensity (instantaneous light: μmol·m-2·s-1) and duration (day). It is expressed as moles of light (mol) per square meter (m-2) per day (d-1), or: mol·m-2·d-1 (moles per day). The DLI concept is like a rain gauge. Just as a rain gauge collects the total rain in a particular location over a period of time, so DLI measures the total amount of PAR received in a day. Greenhouse growers can use light meters to measure the number of light photons that accumulate in a square meter over a 24-hour period.

Taken from ; https://www.extension.purdue.edu/ex...mental lighting or retractable shade curtains.

 

[Shaded_One]

Lux and Par are just measurements of the amount of light per second.

DLI is your daily average of how much light your plant will get in a 24 hour period. You can run 1000 umol/s for 12 hours a day and your DLI would be the same as running 500 umol/s for 24 hours.

This becomes a problem when people don't pay attention to it. For example: person running their lights at 80% throughout veg and then leaves them at 80% when they drop their lights from 18/6 or 24/0 to 12/12. Significant drop in DLI without reducing the intensity of the light.

 

[Peat_Phreak]

You can do a LUX to PAR conversion if your light matches one of the presets

https://sativauniversity.com/lux-to-par-calculator/

But I think you are wasting your time chasing this with a 240W LED light. You can go full blast at 18 inches for 18 hours a day during veg. 12-18 inches for a 12 hours during bloom.

 

[growsince79]

You can do a LUX to PAR conversion if your light matches one of the presets

https://sativauniversity.com/lux-to-par-calculator/

But I think you are wasting your time chasing this with a 240W LED light. You can go full blast at 18 inches for 18 hours a day during veg. 12-18 inches for a 12 hours during bloom.

Always best to learn the light without a meter. Meters are best used to even distribution.

 

[Ph 007]

Daily Light Integral Daily light integral (DLI) is the amount of PAR received each day as a function of light intensity (instantaneous light: μmol·m-2·s-1) and duration (day). It is expressed as moles of light (mol) per square meter (m-2) per day (d-1), or: mol·m-2·d-1 (moles per day). The DLI concept is like a rain gauge. Just as a rain gauge collects the total rain in a particular location over a period of time, so DLI measures the total amount of PAR received in a day. Greenhouse growers can use light meters to measure the number of light photons that accumulate in a square meter over a 24-hour period.

Taken from ; https://www.extension.purdue.edu/extmedia/HO/HO-238-W.pdf#:~:text=DLI is an important variable to measure in,they need supplemental lighting or retractable shade curtains.

Ok Thanks I'll read into this now lol

 

[Ph 007]

You can do a LUX to PAR conversion if your light matches one of the presets

https://sativauniversity.com/lux-to-par-calculator/

But I think you are wasting your time chasing this with a 240W LED light. You can go full blast at 18 inches for 18 hours a day during veg. 12-18 inches for a 12 hours during bloom.

I do have 4 of them, 240x4 leds over 8 plants

 

[Ph 007]

I'll be honest guys I'm fucking lost
This is total new to me, I got some reading to do

I'm getting some of it not all yet

 

[jguit]

Get a proper quantum meter (par). Dont guess.

unrooted clones: - barely any light
seedlings: - 100 - 250 ppfd
early veg: - 200 - 400 ppfd
late veg: 350 - 600 ppfd
beginning of flower: 550 - 700 ppfd
height of flower: 650 - 1000 ppfd

These are all approx ppfd values, no CO2.

 

[Habosabin]

Right now I’m running about 35DLI at the canopy with my auto. And I think 500ppfd. Your plants look good.

 

[Peat_Phreak]

I do have 4 of them, 240x4 leds over 8 plants

How big is the tent?

 

[Ph 007]

How big is the tent?

2m tall, 2m wide left to right ,
1.2 deep


Pretty much 2 4x4 tent stuck together

I use 2 leds to replace a 600w hps, i would normally have 2 x 600 hps in their
Now I have 4x240w led

 

[Peat_Phreak]

Then you have exactly the right amount of lights to run them at 100% all the time except for seedling.