Best coverage for 6 COBS in a 3 x 3?

[Trippyness]

Greetings,

What would the ideal spacing be for 6 COBS in a 3 x 3 under 2100ma
( was sent the wrong drivers, 320H C1400 was what they were supposed to be)
Paid too much for customs etc to send them back, shitty I wont get 1 COB per SQ/f, but shit happens.

PPFD seems high enough.

Using the 3000k 80CRI version.

Please let me know

Trippy

 

[freemanjack]

Greetings,

What would the ideal spacing be for 6 COBS in a 3 x 3 under 2100ma
( was sent the wrong drivers, 320H C1400 was what they were supposed to be)
Paid too much for customs etc to send them back, shitty I wont get 1 COB per SQ/f, but shit happens.

PPFD seems high enough.

Using the 3000k 80CRI version.

Please let me know

Trippy

We aim for 250mm (12") spacing for 40w CoBs and 400mm (16") for 80w, the 'cone of light' (think upside down ice cream cone) is usually around 115-120 deg and 80% (ish) of the emitted light will fall in this area. We have not seen any real problem from wider spacings but too close can cause the canopy to dome in the middle. Our findings have been that watts/lumens is really the big issue, everything else is simply icing on the cake.

 

[Trippyness]

We aim for 250mm (12") spacing for 40w CoBs and 400mm (16") for 80w, the 'cone of light' (think upside down ice cream cone) is usually around 115-120 deg and 80% (ish) of the emitted light will fall in this area. We have not seen any real problem from wider spacings but too close can cause the canopy to dome in the middle. Our findings have been that watts/lumens is really the big issue, everything else is simply icing on the cake.

What do you mean watts/lumens?
You mean lumen per watt or just high lumens and wattage to get good PPFD of around 900?
I am also using this reflector:
http://ca.mouser.com/ProductDetail/Ledil/F13381_ANGELA-W/?qs=ZP3UR5XsUoea4OFSE2Jvcw==
With my calculations I am over 900PPFD at 2.1A with 6 COBS.

Would spacing change with that reflector. I mainly got them to reduce light hitting the sides of the tent and more at the plants.
Thanks for the reply.

Trippy

 

[jeepster1993]

I am running 6 crees in a 3x3 tent.
Running the cobs at 53 watts each, I put them in a kind of circle.

 

[Trippyness]

I am running 6 crees in a 3x3 tent.
Running the cobs at 53 watts each, I put them in a kind of circle.

Nice light.
Your running 1.4A I assume?
that was my plan but to run 9 to get a PPFD of 900+.
6 is around 670 PPFD.
Really nice light though.
Ill be running 6 at 2.1 due to getting wrong drivers, but still 950+ PPFD is fine by me.
I plan of running some tests on 25 vs 50 w a sq/f this year.

How are your temps?
Running a chiller?

I usuialy run 9 3 gallon Coco plants in a 3 x 3.
Wonder how much of an increase in yield this should be even with my fantastic yield results.
Are those 3500k or 4000k?

 

[sixstring2112]

What do you mean watts/lumens?
You mean lumen per watt or just high lumens and wattage to get good PPFD of around 900?
I am also using this reflector:
http://ca.mouser.com/ProductDetail/Ledil/F13381_ANGELA-W/?qs=ZP3UR5XsUoea4OFSE2Jvcw==
With my calculations I am over 900PPFD at 2.1A with 6 COBS.

Would spacing change with that reflector. I mainly got them to reduce light hitting the sides of the tent and more at the plants.
Thanks for the reply.

Trippy

i would skip those reflectors and just run bare cobs.or if you are set on those make sure you have 24inches of space between plants and cobs.

 

[Trippyness]

i would skip those reflectors and just run bare cobs.or if you are set on those make sure you have 24inches of space between plants and cobs.

Would I not increase My penitration?
I plan to keep them 18-24 just like my current blurple.
However, if I can run them closer bare and get deeper I will.
Any proof here onnthe forums bare vs non/
I assume @Rahz or @alesh or @SupraSPL has done something I recall just dont remember where.

 

[freemanjack]

What do you mean watts/lumens?
You mean lumen per watt or just high lumens and wattage to get good PPFD of around 900?
I am also using this reflector:
http://ca.mouser.com/ProductDetail/Ledil/F13381_ANGELA-W/?qs=ZP3UR5XsUoea4OFSE2Jvcw==
With my calculations I am over 900PPFD at 2.1A with 6 COBS.

Would spacing change with that reflector. I mainly got them to reduce light hitting the sides of the tent and more at the plants.
Thanks for the reply.

Trippy

Hey dood, glad to help all I can, those reflectors look to be approx 120 deg and will confine the output from the light to a definite cone with very definite margins, we actually prefer the results from bare cob's. As to light 'hitting the sides' with led's we are actually seeing a difference in plant growth between plants against the walls (covered in mylar) and those next to the door which is only painted white, the point being that with these firehoze's of light it don't matter fer shit what you do with it as long as there is plenty of it and its pointing roughly at the lights, I saw a vid of a dood doing a side by side test with a variety of diff growlights and ALL the plants were leaning towards the led's!! some that were yards away too! If you are new to led's try to unlearn everything you learnt about light with hps' as it seems much of it simply does not apply. Oh and yeah watts or lumens, and plenty of em. dunno bout fancy PPFD coz I only got a basic lux meter but it gives enough data to judge relative intensity.

 

[freemanjack]

i would skip those reflectors and just run bare cobs.or if you are set on those make sure you have 24inches of space between plants and cobs.

agreed 6 m8, we found most optics focus the light too intensely and the plants tended to 'follow a beam' rather than put out general spread of canopy.

 

[Trippyness]

Hey dood, glad to help all I can, those reflectors look to be approx 120 deg and will confine the output from the light to a definite cone with very definite margins, we actually prefer the results from bare cob's. As to light 'hitting the sides' with led's we are actually seeing a difference in plant growth between plants against the walls (covered in mylar) and those next to the door which is only painted white, the point being that with these firehoze's of light it don't matter fer shit what you do with it as long as there is plenty of it and its pointing roughly at the lights, I saw a vid of a dood doing a side by side test with a variety of diff growlights and ALL the plants were leaning towards the led's!! some that were yards away too! If you are new to led's try to unlearn everything you learnt about light with hps' as it seems much of it simply does not apply. Oh and yeah watts or lumens, and plenty of em. dunno bout fancy PPFD coz I only got a basic lux meter but it gives enough data to judge relative intensity.

There is a good COB calculator to calculate PPFD.
I have been running LED for a year now.
I have learned tons.
I still have a 400 HPS that I will never be using again.
My main question is why do people like @Growmau5 use the reflectors over bare if it is better bare?
Still learning optics.

 

[jeepster1993]

I have no clue what my ppfd or any of that is?
The leds are 3500K and they are running at 1.4 amps(53 watts each), decided to stay at 50 watts just for cooling, also have the cobs mounted on 140mm heatsinks. Temps are not an issue. I do chill my reservoir down.
This 320 watt led replaced a 400 watt HPS.

Yield wise...increased about 25%. I need to be careful with that...I only have 1 harvest and in process of another with the led, where I have lots of grows with the 400 HPS. And I changed my genetics.

 

[Trippyness]

I have no clue what my ppfd or any of that is?
The leds are 3500K and they are running at 1.4 amps(53 watts each), decided to stay at 50 watts just for cooling, also have the cobs mounted on 140mm heatsinks. Temps are not an issue. I do chill my reservoir down.
This 320 watt led replaced a 400 watt HPS.

Yield wise...increased about 25%. I need to be careful with that...I only have 1 harvest and in process of another with the led, where I have lots of grows with the 400 HPS. And I changed my genetics.

Im super suprised you learned about COBS without PPFD.
here if you wanna learn: https://www.rollitup.org/t/photosynthesis-per-100-ppfd.880834/
900 is ideal.
25% is quite good!
From what i can tell currently 3000k gives better yields.
3000k 90CRI, results from tests grows are what I am waiting for.
Nice damm grow though!
What genetics you running?

 

[sixstring2112]

There is a good COB calculator to calculate PPFD.
I have been running LED for a year now.
I have learned tons.
I still have a 400 HPS that I will never be using again.
My main question is why do people like @Growmau5 use the reflectors over bare if it is better bare?
Still learning optics.

because none of us really knew how much light got lost on optics/reflectors untill we saw the sphere #'s from @PSUAGRO. tests.it showed like 8% losses for angelinas.since that test i have removed all but 4 of mine from 40 cobs lol.i got a bunch i will sell cheap hahaha

 

[jeepster1993]

Im super suprised you learned about COBS without PPFD.
here if you wanna learn: https://www.rollitup.org/t/photosynthesis-per-100-ppfd.880834/
900 is ideal.
25% is quite good!
From what i can tell currently 3000k gives better yields.
3000k 90CRI, results from tests grows are what I am waiting for.
Nice damm grow though!
What genetics you running?

Was getting seeds from Europe, Herbies. Super lemon haze from HSO is a true treat. 14 cup winnings. One of the great strains.
I live in a legal state, Colorado, but seeds fell in the legal cracks, and non local seeds are really NOT legal, just clones, clones...with all the growing around here, there are cannabis related "crap" bugs and funguses all over, hell the state uses spider mites to control vegetation on the highways.
Seeds.
Oregon. Oregon seeds are available. OES.

 

[Trippyness]

because none of us really knew how much light got lost on optics/reflectors untill we saw the sphere #'s from @PSUAGRO. tests.it showed like 8% losses for angelinas.since that test i have removed all but 4 of mine from 40 cobs lol.i got a bunch i will sell cheap hahaha

I am well aware of reflector loss.
Thats why I want a high PPFD, because penatration is worth the small loss. High PPFD will make the loss not matter much at all if your well over 900 and closer to 1000PPFD.
There is a comparision on PPFD with and without reflectors. They work.

 

[Trippyness]

Was getting seeds from Europe, Herbies. Super lemon haze from HSO is a true treat. 14 cup winnings. One of the great strains.
I live in a legal state, Colorado, but seeds fell in the legal cracks, and non local seeds are really NOT legal, just clones, clones...with all the growing around here, there are cannabis related "crap" bugs and funguses all over, hell the state uses spider mites to control vegetation on the highways.
Seeds.
Oregon. Oregon seeds are available. OES.

I dont buy into the cup winning. Seems rigged in my OP.
Yeah seeds are they way. I never have had a bug probelm and hope I never will.

 

[jeepster1993]

I dont buy into the cup winning. Seems rigged in my OP.
Yeah seeds are they way. I never have had a bug probelm and hope I never will.

The thing about winning a cup is you can guess what others think about the strain. It is rigged. Rigged to pro growers. Some of us personal growers are doing fantastic things.
I really don't think anyone smokes better cannabis than I do.

 

[Trippyness]

The thing about winning a cup is you can guess what others think about the strain. It is rigged. Rigged to pro growers. Some of us personal growers are doing fantastic things.
I really don't think anyone smokes better cannabis than I do.

Exactly, most of us here grow elite genetics and cross our own and do the best possible with lights and new tech to grow the best dank on this earth.
At a cup you get a nice name that people see who then get excited and buy your seeds.
Growing is Botany and a bit of bro science. Some shit works that can be proven.
What is a pro grower theses days. Likely a pro grower on every block.
In the next 10 years there will be some much legal weed that prices will be so low the black market wont be able to thrive. Yet most of us growers who love the hobby more than the $ will continue regardless.
Just by 0.02.

 

[jeepster1993]

I don't necessarily grow to save money. There are shops selling legal for $100 an ounce.
I started growing when the recalls started. The state started testing shop pot and found...things...in it. Dead bugs, insecticides, fungicides, and WTF stuff.

 

[Trippyness]

I don't necessarily grow to save money. There are shops selling legal for $100 an ounce.
I started growing when the recalls started. The state started testing shop pot and found...things...in it. Dead bugs, insecticides, fungicides, and WTF stuff.

Happening in Canada right now with the LP's.
Grow your own, you know whats in it.