Light and and lux confusion ?

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Smokeytit90

Active Member
The general consensus for hanging your light is furthest away In seedling closest in veg and then raised by a few inches during flowering .

but if you read in lux

Seedling about 15k
veg 15-45k
flowering 45-75k

doesnt make a whole lot of sense slightly contradictory.


(Edit forget i posted this if mod can delete )

30-36" from seedling 12-24" veg 18-24" flower

Guess it's just a guideline
 
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MidnightSun72

MidnightSun72

Well-Known Member
Smokeytit90 said:
The general consensus for hanging your light is furthest away In seedling closest in veg and then raised by a few inches during flowering .

but if you read in lux

Seedling about 15k
veg 15-45k
flowering 45-75k

doesnt make a whole lot of sense slightly contradictory.


(Edit forget i posted this if mod can delete )

30-36" from seedling 12-24" veg 18-24" flower

Guess it's just a guideline
Click to expand...
That's not the "general consensus".

You can have the light 2" from the tops and dimmed or you can have it 4ft up and full bright. It's about the intensity the plant receives.

those lux values you posted seem ok. Get a lux meter and check your intensity (unless you got blurple, won't work).

but in general if you put a light over the plant if it makes them droop, it's too much. If they are leaves pointing up looking for more then you can give a little more.
 
twentyeight.threefive

twentyeight.threefive

Well-Known Member
Smokeytit90 said:
The general consensus for hanging your light is furthest away In seedling closest in veg and then raised by a few inches during flowering .

but if you read in lux

Seedling about 15k
veg 15-45k
flowering 45-75k

doesnt make a whole lot of sense slightly contradictory.


(Edit forget i posted this if mod can delete )

30-36" from seedling 12-24" veg 18-24" flower

Guess it's just a guideline
Click to expand...
Where did you come up with those hanging heights?
 
C

ComfortCreator

Well-Known Member
Smokeytit90 said:
The general consensus for hanging your light is furthest away In seedling closest in veg and then raised by a few inches during flowering .

but if you read in lux

Seedling about 15k
veg 15-45k
flowering 45-75k

doesnt make a whole lot of sense slightly contradictory.


(Edit forget i posted this if mod can delete )

30-36" from seedling 12-24" veg 18-24" flower

Guess it's just a guideline
Click to expand...
Outside the sun is millions of miles away, it has huge intensity and all the distances outside are irrelevant.

Indoors it's a matter of lighting type -- how HOT do the lights get, how CONCENTRATED is the light...is it for example a HID light or an LED with lots of diodes...and then how INTENSE the light is.

You must control heat, and how close the tops get to certain types of lighting. Once that is handled, it is merely a matter of how intense the lighting is, which is easy to measure on most apps as lux. Plants use PAR and PPFD measurements, but we get a close approximation using lux.
 
Wastei

Wastei

Well-Known Member
Smokeytit90 said:
First quick online search

bioslighting.com

LED Grow Lights Distance for Cannabis & Other Plants - BIOS Lighting

When setting up grow light fixures, the lamp distance is crutial. At Bios, we've documented & charted everything to help you set up correctly.
bioslighting.com bioslighting.com
Click to expand...
I would toss that piece of garbage. You should only use LUX/ppfd readers to be able to create repeatable values in your own environment. If you've never grown with said strain and light it's impossible to tell the correct numbers.

Manufacturers like higher and greater numbers for "better" advertisment and more profit. People naturally think more and higher is better. New growers only look at the highest numbers without understanding if the data is even usable or not.

People should learn by doing but all the young guys seem to think that a simple Google search tell them what is. Theoretical and practical knowledge is to completely separate things.
 
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Wastei

Wastei

Well-Known Member
Smokeytit90 said:
Because there are tonnes saying the same
Click to expand...
Most people have never even grown Cannabis and use Google as their only point of reference.

While google is great for getting information in general it's very important to check your sources, what they sell to understand their marketing strategies and intentions.
 
S

Smokeytit90

Active Member
twentyeight.threefive said:
"Tonnes" of places don't actually grow cannabis. You might want to consult your light manufacturer over some random google search.

Is there another google link saying the same numbers that you could provide?
Click to expand...
There are many
Even a sub
www.thcfarmer.com

Led Height

Hey guys I'm using a 450 full spectrum led and was wondering how far from the plants should they hang right now I got them about 14 inches or so but my friend told me with led full spectrum u should hang them about 2 inches away what is your thoughts
www.thcfarmer.com www.thcfarmer.com

Plenty of links throwing out distances in inches
 
twentyeight.threefive

twentyeight.threefive

Well-Known Member
Smokeytit90 said:
There are many
Even a sub
www.thcfarmer.com

Led Height

Hey guys I'm using a 450 full spectrum led and was wondering how far from the plants should they hang right now I got them about 14 inches or so but my friend told me with led full spectrum u should hang them about 2 inches away what is your thoughts
www.thcfarmer.com www.thcfarmer.com

Plenty of links throwing out distances in inches
Click to expand...
You linked another growing forum. If you read the responses you'll noticed that they state closer in flower than in veg. Good luck with future Google searches.
 
Moflow

Moflow

Well-Known Member
Smokeytit90 said:
The general consensus for hanging your light is furthest away In seedling closest in veg and then raised by a few inches during flowering .

but if you read in lux

Seedling about 15k
veg 15-45k
flowering 45-75k

doesnt make a whole lot of sense slightly contradictory.


(Edit forget i posted this if mod can delete )

30-36" from seedling 12-24" veg 18-24" flower

Guess it's just a guideline
Click to expand...
What light are you using?
 
E

elgatonegro420

Well-Known Member
Your phone has good light sensors. Download a lux app. However I like around 4000 lux for my seedlings. Keep in mind distance and intensity are used for more then just photosynthesis. Temperature, light bleaching, coverage...blah
 
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C

ComfortCreator

Well-Known Member
Ok, so it is a Kingbrite design mirroring the HLG 4 board fixture.

Ideal starting heights
30+ inches in seedling stage
24+ inches in veg
18+ inches in flower

Now, that is my general guideline. Just because those are my suggested distances, doesnt mean it runs full power.

Watsei told you the most important part. You start by making sure if anything, lights are further away than you expect. You watch and observe their response and want to understand how plants look when they get too much light, the right amount, and too little.

Environment, medium, water and feed must all be right...then you might make light your limiting factor.

Lights CAN be close...some lights 12", some even 6". But as Watsei said, it is very dependent upon what light, and who is doing the growing.

A common strategy is to set lighting height in flower and let the plants stretch towards the lights...others raise the lights as they go. Lots of ways to make it work.
 
S

Smokeytit90

Active Member
ComfortCreator said:
Ok, so it is a Kingbrite design mirroring the HLG 4 board fixture.

Ideal starting heights
30+ inches in seedling stage
24+ inches in veg
18+ inches in flower

Now, that is my general guideline. Just because those are my suggested distances, doesnt mean it runs full power.

Watsei told you the most important part. You start by making sure if anything, lights are further away than you expect. You watch and observe their response and want to understand how plants look when they get too much light, the right amount, and too little.

Environment, medium, water and feed must all be right...then you might make light your limiting factor.

Lights CAN be close...some lights 12", some even 6". But as Watsei said, it is very dependent upon what light, and who is doing the growing.

A common strategy is to set lighting height in flower and let the plants stretch towards the lights...others raise the lights as they go. Lots of ways to make it work.
Click to expand...
Think I've got it sussed maybe a few degrees too hot but only slightly through the day. Going to need a kilowatt meter to dial it in though

Finally got it to flower

light is currently 30" from canopy using about 250 watts seems to be fairly happy .

WIth more ventilation I could probably move closer the canopy

one oscillating fan and a few of fans cooling the qb . Need a quiet inline fan at some point .
 

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