DiY LED - Cree CXA3070

Still nothing can get this out of my mind ....
The combo of CXA3070s: 2700°K Z2 and 4000K AB
(The efficiency loss of 2700 is made up by the extra efficient 4000K AB ..
Their spectrums combined !!! I just have to test this combo ,ASAP ... )
 
Those are some sweet bins. Since we got the LER for the CXA2700K, it seems that the 2700K Z2 bin is about equal with the 3000K Z4 bin when you factor in the increase in photosynthetic efficiency. They would make a great pair.
 
SupraSPL said:
Those are some sweet bins. Since we got the LER for the CXA2700K, it seems that the 2700K Z2 bin is about equal with the 3000K Z4 bin when you factor in the increase in photosynthetic efficiency. They would make a great pair.
Click to expand...


One thing that I've noticed -generally - with NWs at about 4000K ,is their amazing ability ,
to increase quality of herb ( taste/ aroma for sure !For trichome production ,there's allready plenty of 'evidence' that
CW/NW leds do increase somewhat the trichome 'density ' / concentration ...
Plus they are not impacting flowering(yield-wise ) ,like blue monos or CWs ...
Combined with the heavy-red 2700 K ( is like a blue-red mono combo,only with ..whites ..) ...
Have to be superb grow spectrum ..From veg ,up till harvest ...
 
Definitely a result of the LEDs. I never got that kind of color with the HPS. The most purple plant I have is the Ace of Spades and it would get purple calyxs under HPS, but under LED it got much darker purple.

The 3000K COBs have only 10% blue, but even that causes the anthocyanins to come out in almost every plant. I assume the plant keys on 450nm blue to infer the presence of UVA and UVB so they protect themselves with antioxidants.

The Cotton Candy actually smells very good and looks like it is a good yielder. Unfortunately it hermed quite a bit in the uppermost buds. It may be a sterile hermy because there were no seeds, but I plucked most of the stamens as soon as I saw them. Im sure if you ran a few beans you would get a winner.
 
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stardustsailor said:
Still the 3000K Z4 is a wild chip !
A single type of led array(COB ) ,that can grow almost anything !
Wild !
Click to expand...

Few hours back I downloaded the datasheet for the 3070 3000k, I see that there is a new (highest) bin for the 3000K: AB that gives 8500-9130 lumens. The Z4 gives 2% less lumens less at 25C than in a older datasheet, now 7945-8534 lumen.

Today I received an offer from mouser to buy 55 cree's 3070. It looks like it is possible to buy less than 100, despite the cancelation of the order of Cannabare.
 

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SupraSPL said:
The 3000K COBs have only 10% blue, but even that causes the anthocyanins to come out in almost every plant. I assume the plant keys on 450nm blue to infer the presence of UVA and UVB so they protect themselves with antioxidants.
Click to expand...

I think we can attribute the anthocyanins present to the green light the CXA emits. Even under the 2700k 3050 I had a completely purple stems and buds Edit: on my Blueberry Gum. It is a wonder how the CXAs bring out the true nature of these plants :)
 
SupraSPL said:
Definitely a result of the LEDs. I never got that kind of color with the HPS. Even the 3000K COBs with only 10% blue cause the anthocyanins to come out. I assume the 450nm blue causes the plants to assume there is UVA and UVB so they protect themselves with antioxidants.
Click to expand...

Hmmm, very interesting. I'll have to keep that in mind. Still trying to track down sandpaper finer than 400 and a palm sander cheaper than $40.
 
I am glad you brought that up Happy75. I noticed the bin number on my new batch is CXA3070-30H-AB-NOH-00002 but kit number says CXA3070-0000-000N00Z430H. The last batch I got said bin number: CXA3070-30H-Z4-NOH-00002 and kit number CXA3070-0000-000N00Z430H.

So something has changed between batches. I will have to do some testing to see if there is any increase in light. The AB bin would give us about 3% bump in efficiency.
 
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Cannabare I was lead to that conclusion by trying to figure out, what is the difference between HPS spectrum and 3000K CXA spectru? The HPS has huge output in the green yellow and orange range but is lacking in the 450nm range. That is why suspect the 450nm to be the reason for the increase in anthocyanins and terpenes. I also notice a huge increase in anthocyanins and terpenes when I use the red/white/blue modules which have much less green output than the 3000Ks.
 
Bicit, I had to order on eBay to get good wet/dry paper. I get the full sheet s and just cut them to fit. The wet/dry works so much better and of course I do not recommend sanding aluminum dry even if you are using dry paper.
 
Yeah I just exhausted my last local source. I can find 600 grit but no higher. Guess I'm ordering online, maybe I'll find a cheap palm sander too.
 
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