Flowering under low PPFD levels

[Rahz]

Just wondering if anyone has thoughts on the topic. I'm currently rocking a 3x3 with 200w of CXB 3070 4000K AB which comes to an average 520 PPFD. 12/12 started almost 2 weeks ago so no real results to look at yet. Zheol's recent low PAR soil grow was impressive at over 1 GPW. I wonder what the results would be like in hydro? My 3x3 is soil so won't be finding out soon but achieving over 1 GPW would be great.

How low can you go and still achieve GPW gains while maintaining decent quality?

 

[captainmorgan]

My last two grows were in the 2 GPW range at 529 PPFD and it's top shelf.

 

[OneHitDone]

My last two grows were in the 2 GPW range at 529 PPFD and it's top shelf.

Have any pics of that grow?

 

[alesh]

My last two grows were in the 2 GPW range at 529 PPFD and it's top shelf.

And how it comes in terms of yield per area. Do you experience large differences when compared to a higher intensity?

 

[JimmyIndica]

This sounds like? Take yield#s with a grain salt! Its like the weighing your bud 15mins after ya chop Crap! Eye test! Most don't pass!

This also sounds like the "were partly made in USA to We are now made in HongKong B.S.
Nice timing on that too.


Oh yeah and by the way! This is how u don't do it! The smell coming from flower room few days ago alerted me and luckily I was home! 3out6 emitters were cookin off!


Heat dissipation in unused "wups I f-cked up" holes is great!Not! HeavenBright testing done was? Yep it lights up! Send it!
The main problem IMO was the emitter to sink contact.
I will def use the chassis,but all the Meanwell 35 1050s,and artic fans? Straight in the garbage!
Keep one your firefighter buddies on speed dial if you buy a Heavenbright!

 

[Scotch089]

Is there no TIM on there??

 

[Rahz]

Ouch, 3-6?

Word on the street is there will be a new COB lamp on the block in a couple weeks...

 

[tenthirty]

My last two grows were in the 2 GPW range at 529 PPFD and it's top shelf.

Me too at about the same levels, Been doing it for some time now.

 

[JimmyIndica]

Is there no TIM on there??

Yes there was tape,but the sinks that had unused holes? Should have went in the recyclable bucket! Not to the consumer.
Looks to be 3M. There were burs that the emitters were on. Just poor work!

 

[captainmorgan]

Me too at about the same levels, Been doing it for some time now.

My new light will take me from 529 to 740 PPFD with less wattage,really anxious to see how it will affect my yield.

 

[JimmyIndica]

Ouch, 3-6?

Word on the street is there will be a new COB lamp on the block in a couple weeks...

Sorry bout the heavenbright talk, but had to be shared and the V6 was def a low ppfd fixture. Unless your just growing tops!? Low ppfd fixtures are useless.IMO
I don't know? maybe I could have gotten 3g/watt from it

 

[Scotch089]

I'm thinking about softening my center readings (taking a couple 3070s out) so I can drop it closer. The tops down low or off to the side are as large as the ones with the highest readings. (700-1000 vs 350-650)

Wondering if my co2 levels are too low with no fresh air intake for what I'm trying to throw at em. (Always been a problem and looking at seriously correcting it)

I think that's something that's over looked.... what can your space take? Some of us small time growers don't renew our air as well as we should [be able to] so do you really need x amount of photons.

 

[captainmorgan]

I'm thinking about softening my center readings (taking a couple 3070s out) so I can drop it closer. The tops down low or off to the side are as large as the ones with the highest readings. (700-1000 vs 350-650)

Wondering if my co2 levels are too low with no fresh air intake for what I'm trying to throw at em. (Always been a problem and looking at seriously correcting it)

I think that's something that's over looked.... what can your space take? Some of us small time growers don't renew our air as well as we should [be able to] so do you really need x amount of photons.

My new light will have 9 COB's over a 3x3 area and each COB will be centered over each sq/ft for very even coverage.

 

[bicit]

My new light will have 9 COB's over a 3x3 area and each COB will be centered over each sq/ft for very even coverage.

I'm doing something similar. 8 cobs over a 2x4, not perfectly centered over each square foot, but close. Aiming for about 700ppfd after lens losses.

 

[JimmyIndica]

200watts-214g over a 2x2

 

[ttystikk]

I've been running somewhere between 450-600 PPfD with 860W CDM lighting. It's nice, but I'm looking forward to running in the eight hundreds with equivalent wattage of COB LED.

 

[tenthirty]

My new light will take me from 529 to 740 PPFD with less wattage,really anxious to see how it will affect my yield.

What is it going to cost you by the time it is all said and done?
You're on a 3x3 correct?

-Thanks......

 

[captainmorgan]

What is it going to cost you by the time it is all said and done?
You're on a 3x3 correct?

-Thanks......

I've got $709 into it with the drivers,COB's,heatsinks and holders,could have saved $30 on the COB and holder shipping but I wanted them fast and didn't want to wait 20-30 days by China Post.

Here's the thread I started for it.

https://www.rollitup.org/t/another-cree-cxb3590-diy-thread.881691/

 

[tenthirty]

I've got $709 into it with the drivers,COB's,heatsinks and holders,could have saved $30 on the COB and holder shipping but I wanted them fast and didn't want to wait 20-30 days by China Post.

Here's the thread I started for it.

https://www.rollitup.org/t/another-cree-cxb3590-diy-thread.881691/

That would be $2800.00 to upgrade my setup......ouch...

I'm running 20 cxa's now at 30w a sq ft.

 

[Rahz]

Hmm, so for everyone that's ran 450-600 PPFD, if you had unlimited space would you still want to get the PPFD over 800 or chill at 500?