COB spectral research microcab
- Thread starter Positivity
- Start date
Positivity
Well-Known Member
Nothing fancy. Nice thing is it doesn't need to be on long and you don't need to push the leds hard so they can be passive cooled. Just a small driver...aluminum strip...square...or like captain Morgan used a nice floodlight case.I missed this "flower trigger" please point me to information. I can build one.
Just need to dial in how much power you need. A micro box just would need one small 1 - 3w led. A bigger area would probably do better with a bigger 5 - 10w led.
The led in the middle is overkill so I'll be taking that out to make one for my microcab. When I bought the driver I made sure it had the voltage range which would run just run two. In fact...I probably only need one led for this 4 x 2 tent.
10w ledengin 730nm at 700ma. Think it was roughly 7w a led...25w driver actually dimmable..lol. I could trigger the neighborhood...
churchhaze
Well-Known Member
Don't leave it on at night. 
Unless you like stretch. Not sure why anyone would try that anyway....
Unless you like stretch. Not sure why anyone would try that anyway....
Positivity
Well-Known Member
I think it would be a good idea. I'm still feeling all this out but so far I think a small amount is the right amount. Does seem to add extra vigor to plants.
Definitely cree photored or oslon hyper red. I think the better bin cree photored is available mounted on a star...don't have a link on me though.
Positivity
Well-Known Member
Don't leave it on at night.
Unless you like stretch. Not sure why anyone would try that anyway....
I tried to clear that up for you...lol. I said something along the lines of this sh@t is potent and will grow hemp trees
churchhaze
Well-Known Member
SomeGuy
Well-Known Member
so the far reds from 650nm to 730nm help trigger flower onset? Is that your supplemental red? or do you run 650nm as a supplement and then use the 730nm to trigger? I thought red in general is what helped trigger along with the shift in schedule. I did notice a longer time to onset but it seems the vigor makes up for it. HPS is on the red side almost entirely so I figure the high cri and 3000k delayed the onset just a touch compared to normal. Maybe a week more.
Positivity
Well-Known Member
I still haven't memorized the Pf/Pfr thing.
But 730nm at lights out for just a flash...I do a minute now...puts the plants to sleep immediately versus taking 2hrs without any far red exposure. That quicker sleep time ends up making plants show preflowers in 7 days average versus 14 days roughly for me. They also finish at least a week sooner...sometimes more on longer flowering strains
660nm on the other hand triggers the plant to wake up and begin flowering immediately. 660nm stays on the whole time since it is also a Chloro A peak and can grow bud just fine on its own...better than 630nm in my opinion
Manipulating the plants flowering hormones with the light wavelengths they are sensitive too
But 730nm at lights out for just a flash...I do a minute now...puts the plants to sleep immediately versus taking 2hrs without any far red exposure. That quicker sleep time ends up making plants show preflowers in 7 days average versus 14 days roughly for me. They also finish at least a week sooner...sometimes more on longer flowering strains
660nm on the other hand triggers the plant to wake up and begin flowering immediately. 660nm stays on the whole time since it is also a Chloro A peak and can grow bud just fine on its own...better than 630nm in my opinion
Manipulating the plants flowering hormones with the light wavelengths they are sensitive too
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Positivity
Well-Known Member
I think you would be happy with the results... Especially the flower trigger. It would be nice to see someone running white only do a run with a little extra photored
Positivity
Well-Known Member
This is the only photored I know of for sale on a mcpcb..
http://www.cutter.com.au/proddetail.php?prod=cut1866
Good read on the cree photored...
https://www.rollitup.org/t/summer-2014-led-growing-notes.837071/#post-10686231
Positivity
Well-Known Member
Little update.. Not much colas yet. Nice growth though..
Had to get aggressive with the supercropping..resilient little buggers
I just want to see if there's a extra stinky sour diesel of the three...that's the whole point of this cab. Just throw things in and see if any gems pop out without using too much power.
Still need to get better airflow though...I'm not getting the best representation of the genetics with the bad airflow and heat. Although it is better having the watts split between more leds...it's running a bit cooler like this. Just need a extra CPU fan now..
Had to get aggressive with the supercropping..resilient little buggers
I just want to see if there's a extra stinky sour diesel of the three...that's the whole point of this cab. Just throw things in and see if any gems pop out without using too much power.
Still need to get better airflow though...I'm not getting the best representation of the genetics with the bad airflow and heat. Although it is better having the watts split between more leds...it's running a bit cooler like this. Just need a extra CPU fan now..
DonPetro
Well-Known Member
Hey guys how do you all feel about the 5000k cobs? I was thinking two 5000k suplemented with 10- 3w 660nm reds(5 on either side with cobs in middle). Or would i be better off using something in the 4000k range along with the reds? Or maybe 2700-3000k supplemented with 3w 450nm blues? Got a pretty good idea for the design im just a little hung up on spectrum now. Just looking for a full-term seed to harvest friendly spectrum. Thanks!
churchhaze
Well-Known Member
Since white leds are actually just blue leds, it doesn't make sense to get 2700k and supplement with blue, unless the wavelength is different than the underlying blue engine of the whites. (widening the blue) It's also impossible to recreate 3000k using 5000k+660nm as no amount of red will replace the yellows and ambers from the yellow phosphor.
As for how much blue you actually need for flowering, that's sort of a mystery to me. Some say it inhibits flowering and causes wide foliage, while others say it helps with frosting. I honestly have no idea, but I would go with 3000k CREE or 3500k bridgelux as a base just because of the results I've seen. I don't think I've seen results from flowering with 5000k + red yet, just heard people's theory on it.
As for how much blue you actually need for flowering, that's sort of a mystery to me. Some say it inhibits flowering and causes wide foliage, while others say it helps with frosting. I honestly have no idea, but I would go with 3000k CREE or 3500k bridgelux as a base just because of the results I've seen. I don't think I've seen results from flowering with 5000k + red yet, just heard people's theory on it.
Positivity
Well-Known Member
Hard to beat just a 3000k cob. The simplicity, efficiency, amount of successful grows make it the easy winner.
But if your area is smallish and you don't mind experimenting...go for it. I'd make 3k the base though...and just a touch of red...on a switch if you don't want any stretch.
But in a small setup you can make it..change it...adjust it where you want to see it go....
5k with 660nm...might be great together. Apachish...though I think they use closer to 630nm
Mohican
Well-Known Member
Hi Positivity,
You know I totally respect your grow knowledge and LED experience. I am not questioning your talent at all!
I just want to say respectfully that I think LEDs work much better from a greater distance. They are intense like lasers. Maybe try a comparison with one plant far away another midway distance and one close to see.
I have yet to determine the optimal LED distance. I know for vegging I was getting very tight growth during veg from a fairly high distance (3 feet). I have yet to try flowering.
Indicas grow up high in the mountains where there is less atmosphere and the UV and sunlight is more intense. There is so much yet to discover. I am loopy and need sleep...
I just added your Far red info to my grow encyclopedia.
Cheers,
Mo
You know I totally respect your grow knowledge and LED experience. I am not questioning your talent at all!
I just want to say respectfully that I think LEDs work much better from a greater distance. They are intense like lasers. Maybe try a comparison with one plant far away another midway distance and one close to see.
I have yet to determine the optimal LED distance. I know for vegging I was getting very tight growth during veg from a fairly high distance (3 feet). I have yet to try flowering.
Indicas grow up high in the mountains where there is less atmosphere and the UV and sunlight is more intense. There is so much yet to discover. I am loopy and need sleep...
I just added your Far red info to my grow encyclopedia.
Cheers,
Mo
captainmorgan
Well-Known Member
Hey Mo,it depends if your running with lenses or reflectors. I'm running with open COBs and use neither and can get with in 6 to 8 inches. I think POS is running his with reflectors and has to keep more distance. For plants around 4' I like the bare COB but if your doing taller plants the reflectors make more sense for penetration.
It's good to see the 730 nm catching on,I've been using it for two years in Jan.
Positivity
Well-Known Member
Yeah..your absolutely right mo. They are way too close...all the terps are being cooked off. But...it's the only extra space I got and I was trying to make use of it. Things are going a little better now that the power is divided up a bit .
You have me thinking though...full revision. Hate to use the space just for storage
Line the roof with xmls at 350ma with a ventilation upgrade
About time to retire this thread..the space won't let me test these cob spectrums effectively. Maybe I'll revive it if the space grows and I get a cool new led to test out...
