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Building a COB style LED


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#21 Myc

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Posted 27 September 2014 - 09:09 AM

Now there's an interesting thought:

Comparison of construction cost.

 

Here are some known values for a 400w, HID, HPS (400w, High Intensity Discharge, High Pressure Sodium):

 

400w Ballast/Core Kit:             $102.00 (no housing, no factory cords/connectors)

C400s51/ALTO HPS lamp:     $16.00 (standard, commercial, otc lamp)

LU64AC - ducted reflector:     $80.00 

 

Completed fixture:                   $198.00 each (assembly required)


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#22 Hash_Man

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Posted 28 September 2014 - 09:11 AM

First I heard of these KC absolutely interesting  ... great info and links I'm back in school, I have to read back a few times to full understand  ... Thank you for posting  :thumbs_up:  .. I'm right here watching 



#23 torn2bits

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Posted 28 September 2014 - 12:58 PM

I'm interested in this build

#24 kcmoxtractor

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Posted 28 September 2014 - 03:55 PM

In comparison to price, how do these add up compared to HPS? off shelf purchase?

I realize this has to be built, but what does a dit project amount to roughly?

The reason for asking is to see if for disable/ very sick people would this be an alternative for a medical grow?

 

when comparing, are we using watts as a basis for comparison, or square footage?

 

as in-

 

are you asking me for how much it will cost to build 400w worth of COBs, 400w COB

would light about ~14 sq ft

 

or

 

are you asking me how much it costs to light 7 square feet of canopy space?

(i would use a 400 for ~7 sq ft, or a 32"x32" canopy)



#25 kcmoxtractor

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Posted 29 September 2014 - 08:09 PM

updated post #4 with the completed build.



#26 kcmoxtractor

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Posted 29 September 2014 - 08:45 PM

Now there's an interesting thought:

Comparison of construction cost.

 

Here are some known values for a 400w, HID, HPS (400w, High Intensity Discharge, High Pressure Sodium):

 

400w Ballast/Core Kit:             $102.00 (no housing, no factory cords/connectors)

C400s51/ALTO HPS lamp:     $16.00 (standard, commercial, otc lamp)

LU64AC - ducted reflector:     $80.00 

 

Completed fixture:                   $198.00 each (assembly required)

 

you left out a few other items, like electrical connectors, fan to run the air cooled

hood, and other assorted tools. for ease of calculations, i will leave out the cost

of crimp connectors and liquid tape, which would be the same for both projects.

the duct fan would add ~$50 to the cost of the 400w HPS though.

 

Vero 29                               $ 30.00

Meanwell LPF-90-48           $ 43.00

Arctic 11 plus heatsink/fan  $ 10.00

Fan power supply               $ 17.00

Pico EZ mate connectors    $  2.00

 

Cost for a finished COB      $102

 

You would need 3 of these units to equal a 400w HPS in terms of square footage

and finished yield. That would make the cost comparison approximately

Cob $306

400w HPS $250

 

Next is electrical considerations.

 

400w hps draws .4kW/hr x 12 hrs= 4.8 kw per flowering day

210w COB draw .21kW/hr x 12 hrs= 2.52 kw per flowering day

 

if we assign a cost per kWhr of .25 cents, the HPS costs $1.20 per day

if we assign the same cost per kWhr for the COB, cost is $0.63 per day

 

that does not take into account the extra power consumed by the duct fan in the

HPS air cooled hood setup. the setups would need the same wattage for canopy

fans, so that cost is left out of the equation.

 

Though the COB costs about $56 more, the return of investment (hereafter abbreviated

ROI) would be ~98.25 days. That means that on the 99th day, you would have actually

saved money if you chose the COB. if your energy cost is higher than .25 cents per

kilowatt hour, then the ROI would be faster. if your energy cost is lower than .25 cents

per kilowatt hour, then the ROI would be longer.


Edited by kcmoxtractor, 29 September 2014 - 08:52 PM.

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#27 kcmoxtractor

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Posted 29 September 2014 - 09:02 PM

The next factor is bulb cost. IME a HPS lamp is best replaced every 2 grows.
Using 9 week strains that translates to a new bulb every 4 months, or 3 new

bulb purchases a year. Now I will calculate the yearly cost of running both systems

with that included.

 

Per year a 400w HPS would cost

 

(365 days x $1.20 per day electrical cost) + ($16 per bulb x 3 bulbs)= $486

 

Per year 210w of COB would cost

 

(365 days x $0.63 per day electrical cost) + (No bulb replacement)= $229.95

 

COB style LED lamps are rated for 100,000 hours operation, but I will assume

50,000 hours operation before re-lamping.

 

50,000 hours / 12 hours per day = 4166.66666 days operation

4166 days / 365 days per year   = 11.41 years operation before replacement

 

now I will multiply the cost per year by the years to get a long term cost assessment.

 

cost to run HPS for 11.41 years @ $0.25 per kilowatt hour --- $5545.26

cost to run COB for 11.41 years @ $0.25 per kilowatt hour --- $2623.73


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#28 kcmoxtractor

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Posted 30 September 2014 - 09:11 AM

 

You would need 3 of these units to equal a 400w HPS in terms of square footage

and finished yield. That would make the cost comparison approximately

Cob $306

400w HPS $250

 

Next is electrical considerations.

 

400w hps draws .4kW/hr x 12 hrs= 4.8 kw per flowering day

210w COB draw .21kW/hr x 12 hrs= 2.52 kw per flowering day

 

if we assign a cost per kWhr of .25 cents, the HPS costs $1.20 per day

if we assign the same cost per kWhr for the COB, cost is $0.63 per day

 

that does not take into account the extra power consumed by the duct fan in the

HPS air cooled hood setup. the setups would need the same wattage for canopy

fans, so that cost is left out of the equation.

 

Though the COB costs about $56 more, the return of investment (hereafter abbreviated

ROI) would be ~98.25 days. That means that on the 99th day, you would have actually

saved money if you chose the COB. if your energy cost is higher than .25 cents per

kilowatt hour, then the ROI would be faster. if your energy cost is lower than .25 cents

per kilowatt hour, then the ROI would be longer.

 

 

i feel like i should state the ROI math more explicitly.

 

take the starting cost for each, $250 for the HPS, $306 for the COB

then find the difference, in this case $306 - $250 = $56

then find the difference in electrical cost per day: $1.20 - $0.63 = $0.57

then divide the start up cost by difference in electrical cost per day to

find how many days it takes to make up the initial start up cost. $56 / $0.57= 98.245 days

to equalize the initial difference in start up costs.

 

400w-

($250 + (100 days x $1.20 energy cost per day)) = $370 cost the first 100 days

 

COB-

($306 + (100 days x $0.63 energy cost per day)) = $369 cost the first 100 days


Edited by kcmoxtractor, 30 September 2014 - 09:17 AM.


#29 Rhyno

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Posted 05 November 2014 - 12:39 PM

/me places couch and takes a seat! :ph34r:



#30 kcmoxtractor

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Posted 12 November 2014 - 10:22 AM

i will be building more very soon. there was some interest in using them for

flood applications and another friend who lives in a legal state asked me to

build him 2x 200w for his grow. got the first of the parts in today, 24x 4k vero 18.

also have 4 drivers on order to pair with the vero 18s.

 

3x 200w meanwell HLG 185H-C1050A it puts out 95-190v 1050 mA and is

94% efficient at full load. wiring six vero 18 in series should give me a forward

voltage (Vf) of about 175-180 for the string and current will be 1050 mA, perfect

for the HLG 185.

 

the other driver is a meanwell HLG 120H-C1050A 74-148v 1050mA, also 94%

efficient at full load.  wiring 5 vero 18 in a series would give a Vf of 145-148 for

the string and current at 1050mA, perfect match for the HLG 120.

 

vero18.jpg


Edited by kcmoxtractor, 12 November 2014 - 10:53 AM.

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#31 kcmoxtractor

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Posted 12 November 2014 - 10:31 AM

here's the front and back of the floodlight i have ordered.

 

floodheatsink.jpg

floodshell.jpg



#32 TurkeyRanch

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Posted 12 November 2014 - 10:35 AM

That will look freaking amazing when it is done. I can't wait! I know a few people who might like a cool tool like that.
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#33 kcmoxtractor

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Posted 12 November 2014 - 10:50 AM

That will look freaking amazing when it is done. I can't wait! I know a few people who might like a cool tool like that.

 

that's the idea. build a few prototypes and see where it goes. the folks who are

looking at it for flood lights own RV parks and storage facilities along the entire

east coast. talking to a hydroponics wholesaler out west also, two of my first three

prototypes are for the wholesaler to test.



#34 kcmoxtractor

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Posted 20 November 2014 - 01:14 PM

was told that the floods are ready for shipping, now i just have to

wait for customs and it's off to the races.

 

3Ctns to USA.jpg



#35 kcmoxtractor

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Posted 28 November 2014 - 10:27 PM

got my sinks in today, fuckers are huge and weigh about 27 lbs.

 

20141128_222052.jpg



#36 Rhyno

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Posted 13 January 2015 - 09:27 PM

Any progress / updates? :weedpoke:



#37 kcmoxtractor

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Posted 14 January 2015 - 02:35 PM

yeah I have the first six fixtures built, just been staying busy!

 

the ezmates are soldered together in series, only thing that uses a

twist on connector is where the series meets the driver.

Attached Thumbnails

  • flood200w.jpg
  • flood200w2.jpg
  • hlg.jpg
  • cobLED.jpg

Edited by kcmoxtractor, 14 January 2015 - 02:43 PM.


#38 happy4nic8r

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Posted 14 January 2015 - 03:10 PM

This is some quality subject, I myself love the math part.

 

I have been looking at these here, and because they are sort of new, they are really expensive, all put together and such.

 

Power is really cheap here as well, so my Hawaiian concerns over power usage are fading fast.

 

Went from 50 cents plus /KWH in Hawaii, to 5 cents here in PNW. 

 

I don't even want to talk about it.


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#39 Rhyno

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Posted 15 January 2015 - 08:16 PM

$$$ :thumbs_up:  $  :thumbs_up: $$$



#40 Rhyno

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Posted 22 January 2015 - 12:35 PM

If using these in veg. I'm reading that cob leds shouldn't be ran over ~16hrs, any truth to this?  Apollo brand cobs say this.


Edited by Rhyno, 22 January 2015 - 12:35 PM.





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