How much LED light can a plant handle?

We adjust up to about 45w/SF about halfway in flower and drop the COBs quite close in the last 2 weeks or so.

With standard HPS the cutoff for when CO2 becomes usefull is about 1000W. So, say around 700umol/m2 I would venture.

1850 is below the canopy, 20k on outer branches, 65k~ in center at canopy below lights, 86k 2 inches above canopy

ANC said:

We adjust up to about 45w/SF about halfway in flower and drop the COBs quite close in the last 2 weeks or so.

With standard HPS the cutoff for when CO2 becomes usefull is about 1000W. So, say around 700umol/m2 I would venture.

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That's awesome, and I know all light systems are different I'm running Vero cobs and meanwell drivers and right where your running at is where I saw my results maximized.
Sure I could of pushed more by increasing nutes, raising temp and co2 and we could probably see gains just past the 50w per square ft with high quality cobs. So far though a year and a half since I built my first led cob system and Ill never go back to running 1970s street lamp technology lol

Hey what are you running your veros at? Iv just got my light up and running 6x 52v with 2x 1750ma drivers total 546 led watts in a 4x4.

Shawndeadhead said:

That's awesome, and I know all light systems are different I'm running Vero cobs and meanwell drivers and right where your running at is where I saw my results maximized.
Sure I could of pushed more by increasing nutes, raising temp and co2 and we could probably see gains just past the 50w per square ft with high quality cobs. So far though a year and a half since I built my first led cob system and Ill never go back to running 1970s street lamp technology lol

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Shawndeadhead said:

View attachment 4043351 View attachment 4043353 View attachment 4043354 View attachment 4043355 View attachment 4043356 View attachment 4043359 View attachment 4043362 View attachment 4043366 Another friendly reminder of 31.5 watts per square ft cob system I made. Only thing I would change would be going to 600w per 4x4 or 37.5 per cob instead of the 500w I'm using but as you can see. Tons of weight, amazing colors, crystals exploding. No bleaching no burning.

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Just curious...
From center to center how far apart do you have your cobs on one bar or row?

Seconds floor said:

Hey what are you running your veros at? Iv just got my light up and running 6x 52v with 2x 1750ma drivers total 546 led watts in a 4x4.

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I'm running my flower lights at 1050 mAh. Though I'm getting ready to expand and go to 600w at 1400 mAh per 4x4.

Gquebed said:

Just curious...
From center to center how far apart do you have your cobs on one bar or row?

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What I did was knew I wanted 1 cob per square ft. So I laid out a 4'x4' grid on the floor with tape, grided off each 1'x1' section and placed my Cob heatsink in the middle of that 1'x1' square. Once all my cobs were laid out I cut my frames and built the frames around where I wanted to place my lights, ie 1 cob per sq ft close to center as I care to get them!!!!

Lite said:

View attachment 4045135

1850 is below the canopy, 20k on outer branches, 65k~ in center at canopy below lights, 86k 2 inches above canopy

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Is that what your getting off your Vipraspectra LEDs?

Looking shit hot pal. Plants handling them very close! im worried about bleaching mine with the intensity so keeping between 19/21 inches from tops

Shawndeadhead said:

What I did was knew I wanted 1 cob per square ft. So I laid out a 4'x4' grid on the floor with tape, grided off each 1'x1' section and placed my Cob heatsink in the middle of that 1'x1' square. Once all my cobs were laid out I cut my frames and built the frames around where I wanted to place my lights, ie 1 cob per sq ft close to center as I care to get them!!!! View attachment 4046986 View attachment 4046987 View attachment 4046988 View attachment 4046989 View attachment 4046990 View attachment 4046991

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Seconds floor said:

Looking shit hot pal. Plants handling them very close! im worried about bleaching mine with the intensity so keeping between 19/21 inches from tops

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I'm only pushing them at 1050mAh
At canopy on my lux meter I'm getting 45,000-50,000 thats 8" under the cob where I try to keep my canopy but the reality is a handful are at 8" and the rest and majority fall 10-12" range. Never had bleaching problems never burned and leaves or flowers. Mine breaks down to about 31.5 watts per cob so you can get them closer.

Seconds floor said:

Looking shit hot pal. Plants handling them very close! im worried about bleaching mine with the intensity so keeping between 19/21 inches from tops

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Btw which Veros are you running I used Vero 18s @ 1050mAh for my flower lights and Vero 13s @ 700mAh for veg and Vero 10s@ 500 mAh for my mom's and clones while they are in aeroponic cloner. that maybe why I can get mine down close. Here are the readings I get on lux meter as I run the dongle along my canopy level I'm getting a fairly even spread

Shawndeadhead said:

Btw which Veros are you running I used Vero 18s @ 1050mAh for my flower lights and Vero 13s @ 700mAh for veg and Vero 10s@ 500 mAh for my mom's and clones while they are in aeroponic cloner. that maybe why I can get mine down close. Here are the readings I get on lux meter as I run the dongle along my canopy level I'm getting a fairly even spread View attachment 4047006 View attachment 4047007 View attachment 4047008 View attachment 4047009 View attachment 4047010

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Using the Vero29 gen7 B 52v on
7 inch pin heatsinks
Can you convert the lux into effeciancy and ppfd/umol just interested.

Yeah the Vero 29s you could never run that close to canopy, I would say that 1.5-1.75' from canopy that your running is close to ideal.
Here is a discussion on light conversion factors, along with links to multiple formulas and conversion calculations.
It's a lot of work (math and science knowledge) but if you want to know what your light is putting out in ppfd or umols over your area this will be a good place to start. Several valuable links on the following page
www.researchgate.net/post/how_can_I_convert_light_intensity_in_lux_to_micro_moles_per_square_meter_per_second_of_PAR

Thanks for all the help mate much appreciated
Downloaded a lux app to get a rough idea!

Shawndeadhead said:

Yeah the Vero 29s you could never run that close to canopy, I would say that 1.5-1.75' from canopy that your running is close to ideal.
Here is a discussion on light conversion factors, along with links to multiple formulas and conversion calculations.
It's a lot of work (math and science knowledge) but if you want to know what your light is putting out in ppfd or umols over your area this will be a good place to start. Several valuable links on the following page
www.researchgate.net/post/how_can_I_convert_light_intensity_in_lux_to_micro_moles_per_square_meter_per_second_of_PAR

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Seconds floor said:

Thanks for all the help mate much appreciated
Downloaded a lux app to get a rough idea!

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That will get you in the ballpark of brightness, the Vero 29s will probably peg the meter think most of them go up to about 60,000.
Fairly accurate I have a hand held lux meter also and tested them against app meter and then a app meter hardware combo all 3 within a couple percent of each other

Seconds floor said:

Using the Vero29 gen7 B 52v on
7 inch pin heatsinks
Can you convert the lux into effeciancy and ppfd/umol just interested.

Click to expand...

That's Awesome what a very clean professional looking build, that's where I wish I would of slowed down when building my lights, I took all that time measuring and laying out my ideal placement, took my time soldering everything up, but when I built my frames I just slammed them together, and it clearly shows whawhawannnnnn lol
No problem with the help I notice there is a fair amount of disinformation and just plain bad advice flowing around on some of these sites.
I try my best to post my real world experiences with tangible documentation to show what I'm trying to say. Growing has just been years of reading, reading, testing, testing and more reading lol. Just make sure we can filter the bs that's out there.
It's kinda like watching the media now days. Here are a ton of huge lies to absorb, but somewhere in there we sprinkled some truth if we can't see through those kinda things we are done. Why people decide to post bad or wrong information here I really don't have a clue, some people can be very petty and jealous and they don't like to be wrong about things, and they hate seeing someone other than themselves doing good, I'll never understand it but I've watched it play out my entire life.
There are a few on here that really got me pointed in the right direction with COB based Led technology, mostly Growmau5 the amount of free knowledge he has shared is huge.
I didn't know crap about lighting except that I was really burnt out (haha) on hps and mh technology. Building was easy if you have diy mindset it's just taking the time to understand how dangerous electricity is and taking the proper steps to build a safe unit.

Shawndeadhead said:

That's Awesome what a very clean professional looking build, that's where I wish I would of slowed down when building my lights, I took all that time measuring and laying out my ideal placement, took my time soldering everything up, but when I built my frames I just slammed them together, and it clearly shows whawhawannnnnn lol
No problem with the help I notice there is a fair amount of disinformation and just plain bad advice flowing around on some of these sites.
I try my best to post my real world experiences with tangible documentation to show what I'm trying to say. Growing has just been years of reading, reading, testing, testing and more reading lol. Just make sure we can filter the bs that's out there.
It's kinda like watching the media now days. Here are a ton of huge lies to absorb, but somewhere in there we sprinkled some truth if we can't see through those kinda things we are done. Why people decide to post bad or wrong information here I really don't have a clue, some people can be very petty and jealous and they don't like to be wrong about things, and they hate seeing someone other than themselves doing good, I'll never understand it but I've watched it play out my entire life.
There are a few on here that really got me pointed in the right direction with COB based Led technology, mostly Growmau5 the amount of free knowledge he has shared is huge.
I didn't know crap about lighting except that I was really burnt out (haha) on hps and mh technology. Building was easy if you have diy mindset it's just taking the time to understand how dangerous electricity is and taking the proper steps to build a safe unit.

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good words there is a lot of good info here for the most part but there are a few misinformed individuals lol...

Shawndeadhead said:

That's Awesome what a very clean professional looking build, that's where I wish I would of slowed down when building my lights, I took all that time measuring and laying out my ideal placement, took my time soldering everything up, but when I built my frames I just slammed them together, and it clearly shows whawhawannnnnn lol
No problem with the help I notice there is a fair amount of disinformation and just plain bad advice flowing around on some of these sites.
I try my best to post my real world experiences with tangible documentation to show what I'm trying to say. Growing has just been years of reading, reading, testing, testing and more reading lol. Just make sure we can filter the bs that's out there.
It's kinda like watching the media now days. Here are a ton of huge lies to absorb, but somewhere in there we sprinkled some truth if we can't see through those kinda things we are done. Why people decide to post bad or wrong information here I really don't have a clue, some people can be very petty and jealous and they don't like to be wrong about things, and they hate seeing someone other than themselves doing good, I'll never understand it but I've watched it play out my entire life.
There are a few on here that really got me pointed in the right direction with COB based Led technology, mostly Growmau5 the amount of free knowledge he has shared is huge.
I didn't know crap about lighting except that I was really burnt out (haha) on hps and mh technology. Building was easy if you have diy mindset it's just taking the time to understand how dangerous electricity is and taking the proper steps to build a safe unit.

Click to expand...

i have the drivers mounted separately also but i can't take credit for the build i know the basics and could probably get one built but the time hassle and effort put me off especially working nearly 60 hour weeks with family etc
I went halfa with partner so cost wasn't to bad.

Your definitely right about the media whatever side you lean both feed fuel on the fire to divide and conquer.

Seconds floor said:

i have the drivers mounted separately also but i can't take credit for the build i know the basics and could probably get one built but the time hassle and effort put me off especially working nearly 60 hour weeks with family etc
I went halfa with partner so cost wasn't to bad.

Your definitely right about the media whatever side you lean both feed fuel on the fire to divide and conquer.

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No doubt I hope more and more people can wake up to that fact and start ignoring the fake division narratives they push on us all.