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Building a COB style LED


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#61 kcmoxtractor

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Posted 14 August 2016 - 08:12 PM

round 3, today makes 7 days flowering. i will let them get to 14 days

then strip off everything inside and below the trellis. 

 

 

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#62 Hash_Man

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Posted 18 August 2016 - 05:54 AM

That is what I was after. Thanks kcmoxtractor. Learning a lot on this, as I think these COB LED's are really going to be the future of growing. Hell, the efficiency alone is making me debate skipping over buying some 600w HIDs for significantly cheaper just because I know in a years time, they'll save their cost alone, not to mention the revenue that can be generated.
 
Here's to hoping you win that contest! Good luck!
 
Aside from digikey, are there any other suppliers available for the COB LEDs? Google offered very little aside from a bunch of electrical specs.

Right now digikey has 3500k's for 32.00

#63 kcmoxtractor

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Posted 10 January 2017 - 04:38 PM

Been a while, but these fixtures are still killin' it with zero maintenance

or extra costs beyond the initial build. 

 

i've greatly simplified my routine as well, by switching to jack's tomato feED.

 

for months i tried to figure out a soil mixture that would supply the plant with 

enough nutrition so that i could just add RO water, and i couldn't find such 

a mix. now i'm just doing coco coir, growstones, worm castings, a mineral

powder mix, kelp, alfalfa, and bone meal, and using water solubles. i went over to

a local plant nursery and checked out their dry fertilizer salts section, and they

had some jack's tomato feED, $10 for 1.5 lbs. picked up a tub and i have to say,

it's the best fertilizer i've ever used, hands down. here's the recipe i use for it-

 

3 gallons distilled or RO water

1 gallon of hot tap water (360ppm)

1 pint hot tap water (360 ppm)

1 tbsp tomato feed

1 tsp epsom salt

 

dump 3 gallons of distilled or RO into a bucket

 

dissolve 1 tsp of epsom salt into the pint of hot water, dump the pint of dissolved

epsom into the bucket

 

dissolve the tbsp of tomato feed into the gallon of hot water, then dump into

the bucket. it's best to add the nutrients to the hot water, give it a good shake,

then come back after 5 minutes and shake again before mixing into the bucket. 

 

i use that ratio of tap water to distilled or RO so i can hit ~100 ppm of calcium in 

the final solution. i use epsom salts to add magnesium and sulfur, and 

 

Jack-s-Classic-Tomato-FeED.png

 

 

 

few new varieties, krome's the white

 

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king louis og

 

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group shots

 

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20170106_230953.jpg

 

btk kush from last round, these were just coco, castings, and growstones 

for the medium and fed with drippers. yield was crazy high, this total round 

should be 23-24 oz from 455w. 

 

20161205_215520.jpg

 

20161205_215511.jpg

 

20161205_215319.jpg

 

20161228_192132.jpg


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#64 Hash_Man

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Posted 10 January 2017 - 06:17 PM

To say, 'really nice' be an understatement
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#65 Heirloom

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Posted 11 January 2017 - 12:32 PM

Inspiring, a great yield for the watts. Beautiful.



#66 kcmoxtractor

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Posted 11 January 2017 - 03:40 PM

here's the second space, it had a problem in early flowering with thrips and

gnats. used a pyrethrin and sulfur spray that seemed to knock the thrips out

pretty well. used a diatomaceous earth top dressing for the gnats, but they 

came back a bit after a few weeks. it's easy to over apply DE as a top dressing

and it takes forever to water, definitely best applying small amounts daily or

every other day for a few week period IMO.  

 

this tent is a 2x4 with 200w of 3500k bridgelux vero gen7 COBs. should be 

about 50% efficiency for the chips, gen7 really caught up with cree's CXB. 

 

strains are larry's OG and west coast sour diesel. i'm hoping to still hit g/w

even though i had a pest problem. pictures are at 50 days

 

group shots, the taller three in the middle with some coloration are larry. 

 

20170111_134758.jpg

 

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west coast sour D

 

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larry's OG

 

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#67 Myc

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Posted 11 January 2017 - 04:59 PM

I use the "scorched earth" strategy for Thrips and Spider Mites.

 

Harvest, burn, shut off the lights and let things go cold for a year. 

Bugs make me so effing mad.........and the only time I ever get them is when I don't perform quarantine protocol. When receiving genetics from friends - place your cultivars in a sealed glovebox (I'm serious). Take soil samples and water samples - perform microscopy. Examine canopy and vegetative structure - in the nodes and under the leaves. Let the cultivars stay in the sealed glovebox for two weeks minimum. Repeat performance of samples and microscopy.  

Better yet, tell your friend "Thanks, but no thanks." I realize that at times this can be an irresistible proposition - you'll learn eventually (see above). 

 

Spider Mites were the last invader. After 14 months, they should be thoroughly dead. I hope they starved a horrible, nasty demise and roast somewhere in arachnoid hell. 

Should I accept some cuttings from a friend to get started? (LOL trick question alert.)


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#68 kcmoxtractor

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Posted 11 January 2017 - 06:51 PM

i actually got spider mites from a rose i bought at lowes, and the thrips either caught

a ride from the commercial food processing place (they do thousands of pounds of

cole slaw a week and cabbage is notorious for thrips), or from the kale in our garden,

they could have hitched in on me or the dogs. that's the disadvantage of having a 

bio diverse yard and 1000 sq ft of raised beds, if you get a pest outside it balances 

itself out, but the predator might not hitch a ride indoors with the prey. 

 

i don't really care very much about gnats, they seem unavoidable (without a dedicated

facility and lots of safeguards in place) in an indoor grow in my part of the USA. 

 

it's hard for me to say no to clones that pull 1.5 g/w at 30%+ potency. i've been working

on changing my outlook on pest control and favoring prevention instead of treatment. 

when i didn't have pets, a garden, or a yard to care for i never had issues, so i hadn't 

developed a routine for preventing insects. 

 

regularly spraying plants to prevent insects is easier than constant inspection of surfaces

and medium. i found it's best to use a rotation of vegetable oil, dr earth final stop (copy

and pasted from their site- Rosemary Oil, Sesame Oil, Peppermint Oil, Thyme Oil, Cinnamon

Oil, and Garlic Oil, Beeswax, Carrageenan, Cellulose, Citric Acid, Glycerin, Lecithin, and Water),

neem oil, and the sulfur/pyrethrin combo spray, but only use the pyrethrin every other rotation. we

use a biodegradable soap to emulsify the oil products (vegetable, dr earth, neem) and i

feel like that made a big difference in their effectiveness. as long as i stayed on this routine, 

i never had bugs.. if i fuck up and don't follow my rules, stuff like that ^^ happens. 

 

when my rooms finish (even on the perpetual room) i always pull everything out, spray 

the walls, floors, corners, and every other nook and cranny with bleach, and scrub

the bejeesus out of all surfaces. 


Edited by kcmoxtractor, 11 January 2017 - 06:52 PM.

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#69 kcmoxtractor

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Posted 18 January 2017 - 02:08 PM

some king louis shots from the day before harvest. 

 

 

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#70 mate0x

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Posted 20 January 2017 - 11:49 PM

Dank


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#71 Hash_Man

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Posted 21 January 2017 - 06:07 AM

Pretty nice bro, is that from clone or the Tahoe version? either case you have some nice stiff there.

#72 Microbe

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Posted 02 February 2017 - 02:15 PM

Pretty nice bro, is that from clone or the Tahoe version? either case you have some nice stiff there.

Would you believe if i said i was thinking COBs again?!
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#73 kcmoxtractor

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Posted 03 February 2017 - 10:33 AM

the tahoe i was running was from seed. a FOAF was running a lot of cali

connection gear and i found a bean in some of their herb. it was total shit

weed though, so i dropped it. it had problems with herming worse than any

other plant i've run. here's some harvest shots and some shots of the last 

run before we move to CO. the last run from 459w was 23.2 oz, louis is a 

great yielder and the white did surprisingly well. 

 

king louis xiii OG

 

20170120_203015.jpg

 

the white

 

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group shot of larry's og, west coast sour D, the white, and bruce banner x afghani

 

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larry

 

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west coast sour d

 

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Banner x afghani

 

20170122_204246.jpg


Edited by kcmoxtractor, 03 February 2017 - 10:35 AM.

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#74 mate0x

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Posted 07 February 2017 - 11:32 PM

Looks great! I'm going to get something going again soon, it being legal here now and all.


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#75 Heirloom

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Posted 08 February 2017 - 03:44 PM

Anyone tell me how difficult this will be to fix. You see the dead block on this panel.

 Thanks

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  • AA LED 001.JPG

Edited by Heirloom Spores, 08 February 2017 - 03:46 PM.


#76 Hash_Man

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Posted 09 February 2017 - 10:46 AM



post-106305-0-78051300-1486134342.jpg

The White looks extraordinary
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#77 kcmoxtractor

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Posted 11 February 2017 - 10:42 AM

Anyone tell me how difficult this will be to fix. You see the dead block on this panel.

 Thanks

 

fixing that would take as much if not more effort than just swapping the whole board

out with some COBs. i don't know much about PCB leds, but that thing looks like it 

has 6 clusters of LEDs run in parallel, the individual LED clusters are run in series. 

that means one of the diodes is out in that cluster, or the power connections are burnt. 

 

does that light have a heatsink or is the board just being cooled by fans?

 

the white is extraordinary, and yields surprisingly well too. after a couple weeks in the 

jar it's starting to get pretty stinky, but it didn't have much of a smell at first.


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#78 shoomer

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Posted 11 February 2017 - 01:14 PM

Just an FYI for those interested in COBs

​Cree and Veros used to be the only game in town but both Citizen (CLU series) and Luminous (CMX) are equaling or surpassing their par/efficiency #'s these days w/ much nicer prices (CIti CLU048-1212 @ ~$14, Luminous CMX22 @ ~$20).

​There is also a new interest in Samsung LM561c (supposedly like mini-COBs) that has birthed the Quantum Board (an 11"X13" board w/ 304 LM561c) that is being tested by growers as I type.

​I've been thinking along the lines of LM561c LED tape (avail. from Alibaba) mounted on alum. sheet for better spread of both light and heat but have yet to be able to afford the time to build a prototype.

​LEDs, IMHO, are the future of efficient growing.

​MAJOR kudos on your build and your willingness to share your experiences!


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#79 Heirloom

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Posted 11 February 2017 - 01:41 PM

Thanks kcmox, it has fans . I got this early in the led grow craze

 I really like the white Leds, I got a few I use for a large house plant grow, including psychedelic cacti.
They have large heatsinks. They work great .

 I like the cobs I see built here , white light seems natural.

 Not going to worry about the led panel , live and learn.

 Thanks again.



#80 kcmoxtractor

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Posted 12 February 2017 - 11:06 AM

Just an FYI for those interested in COBs

​Cree and Veros used to be the only game in town but both Citizen (CLU series) and Luminous (CMX) are equaling or surpassing their par/efficiency #'s these days w/ much nicer prices (CIti CLU048-1212 @ ~$14, Luminous CMX22 @ ~$20).

​There is also a new interest in Samsung LM561c (supposedly like mini-COBs) that has birthed the Quantum Board (an 11"X13" board w/ 304 LM561c) that is being tested by growers as I type.

​I've been thinking along the lines of LM561c LED tape (avail. from Alibaba) mounted on alum. sheet for better spread of both light and heat but have yet to be able to afford the time to build a prototype.

​LEDs, IMHO, are the future of efficient growing.

​MAJOR kudos on your build and your willingness to share your experiences!

 

i use bridgelux because you don't have to worry about learning the binning codes,

and every LED is guaranteed to work at least as well as the datasheets. it's frustrating

waiting for a certain bin to be available to complete your build. i checked those citi

cobs, they don't even get close to the efficiency #s of the bridgelux vero gen7, the 

gen7 can hit up to 200 lumens per watt. citi is also more expensive than bridgelux

gen7 vero 18s watt for watt, the gen7 v18 line has a chip for $10 that dissipates 40w.

 

the LM561c is a nice LED. the 4,000k model is rated at 207 lumens per watt, but i

wouldn't buy anything from alibaba. i am moving to colorado within the month though,

and have already emailed the quantum board folks and plan to stop and purchase

a dozen boards on my way out west. you could figure out what kind of PCB they need

to be mounted on and DIY your own LM561c fixture.


Edited by kcmoxtractor, 12 February 2017 - 11:08 AM.

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