Grandmaster Level - HLG Quantum Boards vs 1000w HPS side by side (youtube)

[Evil-Mobo]

I think it has a lot to do with the distance if you want to avoid stress. I am thinking of Lukio's Garden as an example. He usually uses a very large distance and gets, as we all know, very good and consistent results. At 800μmol/s/m² signs of stress are already recognizable and it is more difficult to keep the plants healthy(CalMag, more nutes).
Although I have only a lux meter, I have best results with 40-50.000lx,(~40klx canopy, ~50klx main colas) which should be about 550-700μMol/s/m² and there is no need for additional CalMag every week. With higher intensities I needed more CalMag. Now with F-stripes I hope to use less distance, so that I can save some more energy and still get the desired 40-50klx.

I what distance from the canopy are you getting these readings?

 

[Randomblame]

24-28", ~330w, 2x 4' tent..., 8x CXB3590's@1050mA.
Now I have a new light based on F-strips and CRI90 COB's running at low current(525mA).
Due to the better light distribution, I hope to be able to reduce the distance without getting light stress.
But because of the UVB tube in the center I think I will end at best with 16-20 "....

 

[Evil-Mobo]

24-28", ~330w, 2x 4' tent..., 8x CXB3590's@1050mA.
Now I have a new light based on F-strips and CRI90 COB's running at low current(525mA).
Due to the better light distribution, I hope to be able to reduce the distance without getting light stress.
But because of the UVB tube in the center I think I will end at best with 16-20 "....

Yes you will need to be firther away die to the UV light I can tell you that from experience lol.

What are you using to measure your readings? I only ask because at 24" my readings are not that high

 

[Dave455]

Yes you will need to be firther away die to the UV light I can tell you that from experience lol.

What are you using to measure your readings? I only ask because at 24" my readings are not that high

Lux reading at canopy ? PAR numbers ?

 

[Evil-Mobo]

Lux reading at canopy ? PAR numbers ?

Lux reading at canopy 15-18K no par tool too expensive to justify as a regular Joe growing hisnown meds distance to canopy 30" in veg and 24" in flower .

 

[since1991]

You don't have a lux or par light meter but as a general guide you say 20 watts per square foot? Damn that seems awfully low. Granted I havent delved into the led world yet but seems 20 watts psf of any light would just push out larfy airy popcorn. Hell...my mh and t5 veg lights are more than that. Way more. Led is that much of a different ball game???

 

[NanoGadget]

Sounds like it's time for a side by side. Identical rooms, identical lights, clones from the same mother. 1 side using the current 'standard' guidelines for watts per square foot and nutrient application, 1 side using the less is more theory. Wish I had the time and space to try it myself... anybody feeling like an experiment?

 

[Humple]

You don't have a lux or par light meter but as a general guide you say 20 watts per square foot? Damn that seems awfully low. Granted I havent delved into the led world yet but seems 20 watts psf of any light would just push out larfy airy popcorn. Hell...my mh and t5 veg lights are more than that. Way more. Led is that much of a different ball game???

It's more common to run around 30w/sq ft with white light LEDs such as COBs, QBs, and strips. And yes, a very different ball-game. You're quite simply getting more light per watt.

 

[Evil-Mobo]

You don't have a lux or par light meter but as a general guide you say 20 watts per square foot? Damn that seems awfully low. Granted I havent delved into the led world yet but seems 20 watts psf of any light would just push out larfy airy popcorn. Hell...my mh and t5 veg lights are more than that. Way more. Led is that much of a different ball game???

That's what I am currently running. And with lux number you can do the math and get your par brother .This is the info I am looking for and hence why I was specifically looking for the LED conversion factor. And yes coming from HID to LED I can tell you it is definitely a different ball game

I'm not recommending anything I am giving my opinion based off of what is going on in my grow .And I am trying to make sense of what is happening before my eyes with less than half the recommended watts per sq ft and at much greater distance from the canopy.

 

[since1991]

Where did I say that's what I recommend? That's what I am currently running. And with lux number you can do the math and get your par brother .This is the info I am looking for and hence why I was specifically looking for the LED conversion factor. And yes coming from HID to LED I can tell you it is definitely a different ball game

I'm not recommending anything I am giving my opinion based off of what is going on in my grow .And I am trying to make sense of what is happening before my eyes with less than half the recommended watts per day ft and at much greater distance from the canopy.

Didnt mean it like that bro. Simmer. Just saying you said less than 20 watt psf is what you got. And your garden is jamming. "Guide" was the wrong word. Simmer.

 

[Evil-Mobo]

Didnt mean it like that bro. Simmer. Just saying you said less than 20 watt psf is what you got. And your garden is jamming. "Guide" was the wrong word. Simmer.

I am.simmer brother just smoked a nice blunt of Fookies from my recent batch.

Yes if we take the manufacturers dimension for my over sized 4x8 and the total amount of watts I am pulling at the wall the math is under 20 like 19.4 or something like that .If we just go off of the 4x8 area itself (both trays) we are still at like 21 and change. Both numbers way lower than what a lot of folks are doing and being told and I have done in the past .

And sorry man so.many trolls on here lately hard to tell sometimes who's being genuine and who's being a douche lol

 

[nfhiggs]

I think we just misunderstood each other man no biggie I'm not trying to pick a fight lol.


You said that and what I was saying is after the lights are set how would this happen, but I see now you're talking about one grow to the next.

It's all good

No prob, I was just completely confused by what you wrote. It just seemed self contradictory

Its all good.

 

[Randomblame]

Lux reading at canopy 15-18K no par tool too expensive to justify as a regular Joe growing hisnown meds distance to canopy 30" in veg and 24" in flower .

I'm using a cheap 10$ e3ay lux-meter, buddy, which shows quite accurate numbers compared to my calculations.
Twice as much as with smartphone apps, btw! I found an app that had a calibration function, but even with calibration to the e3ay lux-meter numbers, there are no accurate readings. My front sensor(I have a oneplus3) seems to have a limit, because it shows max. 35999lx, no matter how close I get to the light. I think the 10 bucks was well invested!
The sensor is mounted on a rod and the display unit is detachable with Velcro attached so that I can easily get into all corners. At 24" and 20w/sft, your numbers should be twice as high, estimated from my readings at least 30000lx!

You could try these tool to calculate PAR numbers at different heights from lumen and spectrum.

http://dev.edman007.com/~edman007/pub/par-dli-cal.html

 

[BuddyColas]

I'm using a cheap 10$ e3ay lux-meter, buddy, which shows quite accurate numbers compared to my calculations.
Twice as much as with smartphone apps, btw! I found an app that had a calibration function, but even with calibration to the e3ay lux-meter numbers, there are no accurate readings. My front sensor(I have a oneplus3) seems to have a limit, because it shows max. 35999lx, no matter how close I get to the light. I think the 10 bucks was well invested!
The sensor is mounted on a rod and the display unit is detachable with Velcro attached so that I can easily get into all corners. At 24" and 20w/sft, your numbers should be twice as high, estimated from my readings at least 30000lx!

You could try these tool to calculate PAR numbers at different heights from lumen and spectrum.

http://dev.edman007.com/~edman007/pub/par-dli-cal.html

View attachment 4113106 View attachment 4113107

As a fellow LUX meter user, you might enjoy this thread.
https://www.rollitup.org/t/par-multiplier-thread.928907/

 

[Evil-Mobo]

I'm using a cheap 10$ e3ay lux-meter, buddy, which shows quite accurate numbers compared to my calculations.
Twice as much as with smartphone apps, btw! I found an app that had a calibration function, but even with calibration to the e3ay lux-meter numbers, there are no accurate readings. My front sensor(I have a oneplus3) seems to have a limit, because it shows max. 35999lx, no matter how close I get to the light. I think the 10 bucks was well invested!
The sensor is mounted on a rod and the display unit is detachable with Velcro attached so that I can easily get into all corners. At 24" and 20w/sft, your numbers should be twice as high, estimated from my readings at least 30000lx!

You could try these tool to calculate PAR numbers at different heights from lumen and spectrum.

http://dev.edman007.com/~edman007/pub/par-dli-cal.html

View attachment 4113106 View attachment 4113107

Wanted to come back and TY for the info here I will be ordering one of these tonight to start messing with. I had a friend of mine who downloaded a different app take readings too and then thinking his were accurate he decided to do a test and the app would give different readings just between the front and rear cameras being used. I know apps suck for things like this but I just figured with how cheap meters are the apps would need to be pretty on the spot you know. So I will re take some reading when I get my meter and go from there.

 

[Evil-Mobo]

I'm using a cheap 10$ e3ay lux-meter, buddy, which shows quite accurate numbers compared to my calculations.
Twice as much as with smartphone apps, btw! I found an app that had a calibration function, but even with calibration to the e3ay lux-meter numbers, there are no accurate readings. My front sensor(I have a oneplus3) seems to have a limit, because it shows max. 35999lx, no matter how close I get to the light. I think the 10 bucks was well invested!
The sensor is mounted on a rod and the display unit is detachable with Velcro attached so that I can easily get into all corners. At 24" and 20w/sft, your numbers should be twice as high, estimated from my readings at least 30000lx!

You could try these tool to calculate PAR numbers at different heights from lumen and spectrum.

http://dev.edman007.com/~edman007/pub/par-dli-cal.html

View attachment 4113106 View attachment 4113107

So I got my meter in same as yours but the sensor is fixed and doesn't extend out.

The flower tent is giving me readings in the 26K-30K range. Will see if I can mess around in the veg tent .

 

[Warpedpassage]

You don't have a lux or par light meter but as a general guide you say 20 watts per square foot? Damn that seems awfully low. Granted I havent delved into the led world yet but seems 20 watts psf of any light would just push out larfy airy popcorn. Hell...my mh and t5 veg lights are more than that. Way more. Led is that much of a different ball game???

Hope you guys dont mind me chiming in a bit. I have strong feeling that once everything is said and done , its will become clear that certain strains can really produce good to great flowers with really low wattage. I would love for you folks playing with low wattage to give dynasty genetics like moose n lobsta a try. There are phenos in that strain will without a doubt get nice and chunky with 20-25 watts/sqft.

 

[Evil-Mobo]

Hope you guys dont mind me chiming in a bit. I have strong feeling that once everything is said and done , its will become clear that certain strains can really produce good to great flowers with really low wattage. I would love for you folks playing with low wattage to give dynasty genetics like moose n lobsta a try. There are phenos in that strain will without a doubt get nice and chunky with 20-25 watts/sqft.

I'll have a look and see what's up thanks for the info.

 

[ANC]

My LEDs are way less than a foot above the closest colas. maybe 15 to 20cm....
I am running about 51000 lumens of 3k over 2x4

 

[sethimus]

There are phenos in that strain will without a doubt get nice and chunky with 20-25 watts/sqft.

20-25 watts of what light at which efficiency? there's a reason smart people use ppfd to describe that measurement more exactly...