Intro to led - feedback

skoomd

Well-Known Member
No its not.

You have never grown under any white leds? How many grows do you have under your belt with hid lighting?
Explain how it's not true then.

I will link a study that proves it...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4559655/

"Plants use diffuse light more efficiently than direct light, which is well established due to diffuse light penetrates deeper into the canopy and photosynthetic rate of a single leaf shows a non-linear response to the light flux density."

Using more spread out lights with the same overall intensity boosts diffusion through the roof.

And also explain how it's not true that a 70w COB at 10" producing 1300PPFD does not let you grow as close to the lights as 33w strips that dont hit 1300PPFD til 1" away from them.
 

Randomblame

Well-Known Member
This is great - thanks everyone. Links to QBS that you recommend? I figured these were junk - this is for a secondary tent, I’m using a 600w HPS now.

respect,
pal

LMFAO! WTF helped you to figured this out..?
The new QB2.0 will be top notch and pretty much the cutting edge in LED technique with the worlds most efficient white LED(up-to 220lm/w). Only a hand full lights can compare to that effiency.
A 600w HPS is ~150lm/w ...new! And you need a new bulb every year...! If you do not plan to use them vertically(to avoid reflector loss), you give away a lot of potential yield. If already HPS in a 4x 4', then vertically and preferably 2x 600w, lol!

Like here:
https://www.rollitup.org/t/strip-leds-in-the-garden-of-paradise.954799/page-14#post-14115147
 

diyled

Well-Known Member
Explain how it's not true then.

I will link a study that proves it...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4559655/

"Plants use diffuse light more efficiently than direct light, which is well established due to diffuse light penetrates deeper into the canopy and photosynthetic rate of a single leaf shows a non-linear response to the light flux density."

Using more spread out lights with the same overall intensity boosts diffusion through the roof.

And also explain how it's not true that a 70w COB at 10" producing 1300PPFD does not let you grow as close to the lights as 33w strips that dont hit 1300PPFD til 1" away from them.
:wall:

What ever the wife is cooking smells very nice, im gonna go eat that and get high rather than carry on with this nonsense.
 

skoomd

Well-Known Member
Wtf No YoYo's Hold Up Your Ton-O-Fluff?? Lmao You Say You Dont Use Cobs What Do I Spy In Da Middle????????
Not my pic. I just wanted to clarify that QBs penetrate actually better than COBs do and a picture would be a good way toat least show it isn't the otherway around.

He used 80% QBs and 20% cobs in terms of wattage.

But you should read the post i made with the 2 pictures above... It's a perfect diagram showing why COBs dont penetrate as well as a larger source like qbs/strips.

Unless you believe that a COB, being an intense small light source, magically causes photons to travel further than a spread out light source of the same overall intensity in a reflective grow space.
 

The Dawg

Well-Known Member
Not my pic. I just wanted to clarify that QBs penetrate actually better than COBs do and a picture would be a good way toat least show it isn't the otherway around.

He used 80% QBs and 20% cobs in terms of wattage.

But you should read the post i made with the 2 pictures above... It's a perfect diagram showing why COBs dont penetrate as well as a larger source like qbs/strips.

Unless you believe that a COB, being an intense small light source, magically causes photons to travel further than a spread out light source of the same overall intensity in a reflective grow space.
 

coreywebster

Well-Known Member
LMFAO! WTF helped you to figured this out..?
The new QB2.0 will be top notch and pretty much the cutting edge in LED technique with the worlds most efficient white LED(up-to 220lm/w). Only a hand full lights can compare to that effiency.
A 600w HPS is ~150lm/w ...new! And you need a new bulb every year...! If you do not plan to use them vertically(to avoid reflector loss), you give away a lot of potential yield. If already HPS in a 4x 4', then vertically and preferably 2x 600w, lol!

Like here:
https://www.rollitup.org/t/strip-leds-in-the-garden-of-paradise.954799/page-14#post-14115147
I think he ment the lights he had mentioned in the first post were junk. Not the QBs were junk :bigjoint:
 

coreywebster

Well-Known Member
Not my pic. I just wanted to clarify that QBs penetrate actually better than COBs do and a picture would be a good way toat least show it isn't the otherway around.

He used 80% QBs and 20% cobs in terms of wattage.

But you should read the post i made with the 2 pictures above... It's a perfect diagram showing why COBs dont penetrate as well as a larger source like qbs/strips.

Unless you believe that a COB, being an intense small light source, magically causes photons to travel further than a spread out light source of the same overall intensity in a reflective grow space.
That diagram is more relevant to a single source light like HID, pretty much no cob guy is running one cob. 9 cobs is going to eliminate shadowing.
 

skoomd

Well-Known Member
That diagram is more relevant to a single source light like HID, pretty much no cob guy is running one cob. 9 cobs is going to eliminate shadowing.
Yeah I know. But you'd be surprised how direct and uneven cobs are compared to more spread light even when you use a good amount. Especially closer up.

It makes a big difference. COBs just act as mini spotlights (with a 120 degree beam lol) even at lower wattages, versus a canopy of diodes that all diffuse together evenly.
 

Aolelon

Well-Known Member
where did you come up with that number? im not sure which voltage or flux bins the 301bs are but when i pick top flux bin for both 561C and 301b and AZ voltage bin for both i see 4% gain which is about in line with cob gens year over year
Stephen explained it in a couple other posts. After thermal dissipation, and other things it comes out to an 8-10% increase.
 
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