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Building a COB style LED


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#41 kcmoxtractor

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Posted 22 January 2015 - 08:29 PM

as long as you keep them cool you're good. the apollo brand's heat dissipation is

probably sub par. some folks run 24hr for veg, but i've never seen any issues in the

time COBs have been around.



#42 Dipole

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Posted 31 January 2015 - 06:24 PM

You have a really nice setup man.  The efficiency of the LED systems is a mind blower, and to think, it will only get better.  Those LED current supplies are too cool too.  94%, yeah.  When I took high school physics way back in 1974, I remember the teacher saying that transformer works on AC not DC, "...if anyone invents a DC transformer, let me know.  I want to get in on the patent."  Oh how things have changed.


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#43 TheObserver

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Posted 02 February 2015 - 11:11 AM

That's quite a savings when you think of the long term usage. I'd be interested in trying these out yet the math is over my head and I don't have the time to build one myself.
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#44 dead head jed

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Posted 02 February 2015 - 11:26 AM

You can buy led "flood lights" that are simple plug-n-play. From 10 to 100w pretty cheap these days. If i didn't aleady have my micro set up lights i would have gone that route
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#45 kcmoxtractor

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Posted 09 February 2015 - 11:56 PM

those led flood lights only make 70-90 lumens per watt on the LED level,

even less on the system level once driver losses are considered. the fixtures

i'm building make about 130 lumens per watt on the LED level and 120

lumens per watt on the system level because of an extremely efficient driver. 

 

i took my fixture to the folks at lithonia lighting and they are interested in

carrying it, i just need to get it UL certified first, which is pretty spendy.


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#46 Dipole

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Posted 11 February 2015 - 04:20 PM

I worked with a guy for many years getting stuff made in Taiwan and then China.  I had developed a product that I was intending to build in the US.  Then I met the man I would end up working with.  He urged making the product overseas.  If I didn't I would get ripped off and I would be out priced.  So I had the product made overseas.  Bootstrapping ain't easy.


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#47 tobh

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Posted 18 February 2015 - 01:27 PM

heh, funny a search on google brought this thread up as the second suggestion. You got a clean design there kcmoxtractor. Definitely inspirational, I intend on building a COB LED set up here in the next month or so, as funds trickle in of course.

 

Was going to buy a 600w switchable magnetic ballast and air cooled hood but my mentor referred me to COB LEDs as a cost effective/heat efficient alternative. For a 6' x 6' area, where would you say the overkill point is? I intend on purchasing some Cree CXA3070 from digikey, I'm just not sure how many I should get. At $40 a pop, trying to stay around the $200-$300 range for everything.



#48 kcmoxtractor

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Posted 18 February 2015 - 01:27 PM

got invited to participate in a contest for agricultural innovators in

my home state. filling out the application now, the prize is more

than enough for the UL certification and a marketing campaign for

this project. :chucks:


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#49 kcmoxtractor

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Posted 18 February 2015 - 01:39 PM

heh, funny a search on google brought this thread up as the second suggestion. You got a clean design there kcmoxtractor. Definitely inspirational, I intend on building a COB LED set up here in the next month or so, as funds trickle in of course.

 

Was going to buy a 600w switchable magnetic ballast and air cooled hood but my mentor referred me to COB LEDs as a cost effective/heat efficient alternative. For a 6' x 6' area, where would you say the overkill point is? I intend on purchasing some Cree CXA3070 from digikey, I'm just not sure how many I should get. At $40 a pop, trying to stay around the $200-$300 range for everything.

 

 

not to be the bearer of bad news, but you're going to need a LOT more

money for that project. your projection MIGHT be enough for the heat

sinks and shipping. you would need, at minimum, 18 COBs, drivers,

sinks, wire, and all other parts for the build. those COBs are best run

at 40-50 watts a piece, and using 25-35 watts per square foot as a

benchmark puts you in the range of 900w-1260w. if you ran them at

25 watts per square foot, and 50 watts per emitter, that would be 18

COBs. if you ran 35 watts per square foot and only 40 watts per emitter,

you would need 31 COBs.


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#50 tobh

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Posted 18 February 2015 - 04:21 PM

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.



#51 kcmoxtractor

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Posted 18 February 2015 - 04:28 PM

digikey seems to be the best from what i know.

 

i think what really sets them apart is the photon density. when you

have that much light being irradiated in a 120 degree cone, it's pretty

serious!


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#52 kcmoxtractor

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Posted 18 February 2015 - 04:32 PM

you could also look into bridgelux vero 18, price is significantly

lower per square foot of garden space.


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#53 tobh

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Posted 18 February 2015 - 05:49 PM

K I'll look into them as well. Right now it's coming down to price point until my other business prospects pick up. Affordability is the deal breaker really and the more I'm researching, I think LEDs are going to be sidelined until there's a budget that can support doing what I would like with the space I have. Thanks for the direction!



#54 TheObserver

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Posted 19 February 2015 - 01:58 AM

My area is 3'x3'x7'. Would one of these be enough light for say two plants and two more in a type of perpetual grow? I was also opting towards purchasing a 600w lumatek ballast, air cooled hood, and hotilux eye lamp. Now I'm swaying this way. These are cool.

#55 kcmoxtractor

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Posted 19 February 2015 - 09:54 AM

one of these is good for anywhere from 6 to 8 square feet, so your space

would work really well!



#56 kcmoxtractor

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Posted 28 June 2016 - 10:07 AM

COBs work really well! these were all just random bag seed, nothing special. 

 

20160525_213049.jpg

 

20160516_233539.jpg

 

20160529_142558.jpg


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#57 Roasty McToasty

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Posted 28 June 2016 - 10:29 AM

Badass kc! Love the cobs.

#58 Hash_Man

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Posted 28 June 2016 - 11:27 AM

Pretty good looking bag seed bro.

KC . . since you popped in, wanted to tell you this thread and the links in your first post was my first exposure to cobs . . . I'm just now jumping on the band wagon, thanks
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#59 kcmoxtractor

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Posted 03 August 2016 - 11:17 AM

More of the bag seed, pics @ approximately 45 days flowering. 

 

 

20160726_233020.jpg

 

20160726_233117.jpg

 

20160726_233139.jpg

 

20160726_233154.jpg


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#60 kcmoxtractor

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Posted 06 August 2016 - 10:35 AM

Picked up a cheap clip-on macro lens, I'm pleased with it for $7!

 

 

btk kush

20160805_210146.jpg


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