Introducing CobKits.com - specializing in DIY and Citizen COBs

MediheaLed

MediheaLed

Well-Known Member
Hello. Is this refund on shipping thing correct? I sent you an email but seems here is a better place to contact you. If I ordered a 120-48, on the 22nd of January. The total was $43. My riu disc. Got me $4. Off. Shipping said 14.44. I only live 5-6 hours away from your shop. As of today I still have not received the driver and the tracking says the post office got a notice of shipping notice sent, awaiting item. I am confused, has it been sent? I figured for that 14.44 i would have got it in the 2-3 days I heard about.
So I can get some funds back too?
 
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CobKits

CobKits

Well-Known Member
MediheaLed said:
Hello. Is this refund on shipping thing correct?
Click to expand...
yes but its done in batches and is usually a few days later


MediheaLed said:
I sent you an email but seems here is a better place to contact you.
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its not because i dont have the order info or name in front of me when you email me here.

i think i know which order is yours and ive already responded, if not please email me again
 
emepher

emepher

Well-Known Member
thetr33man said:
How does the RIU discount work. Its not that I cant afford it, its just a peeve of mine when businesses gouge for shipping... Even flat rate boxes are kind of a rip off unless you are shipping something heavy IMO.
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Sorry, but he's not gouging for shipping. When businesses offer free shipping, they don't magically ship things for free, they build the shipping cost into the item prices. He doesn't do that, and the total price you pay (item price + shipping) is still fair, and likely unbeatable. Some of what he offers is hard enough just to find at all.
 
MediheaLed

MediheaLed

Well-Known Member
Ok, I didn't know you really were, literally, a one man shop. Yes, the price is great, but , maybe Amazon prime gots me spoiled, or I'm part of the me generation or something but the cash is out of the account and I don't have my driver! And its not in the mail 4 days later. The only thing more addictive than growing is COB diy. I just need my fix is all. Good luck and thank you.
Jamie did email me and said they refund in batches, so I'm mostly satisfied. Rant over.
 
thetr33man

thetr33man

Well-Known Member
Personally I wouldnt mix spectrum on a single driver. Wouldnt be horrible to have 2 drivers in a grow area tho, one with 4000k cobs for veg and then add another driver and cobs with 3000k or 2700k cobs for flower...
 
G

glitchsta

Member
Hi everyone, this is my first LED build. I am building it for my 3x3 tent. It was a toss up between a LEC light or LED to keep the heat down inside the tent. Looks like I am going the DIY COB route right now. Below is a list of parts I am going to start buying, does it look OK to you guys? I don't want to order the wrong parts. A few questions I have are: Is 3500K the right COB for me? I am going to veg and flower with the same fixture. Will the MeanWell HLG240H-C2100B driver work good to push 5x CLU048-1818? Should I go ahead and order the Star Heat Sinks or wait till someone gets the pin fin heatsinks in stock. Northerngrowlights will have them in stock on 2-10-17 and they are $5 cheaper. Anyone know where to buy the heatsinks? I am planning on doing a build similar to the MAU5-V Grow Kit just with Citizin Cobs instead. Any tips or suggestions on parts to make this build better or cheaper are greatly appreciated as I am a little lost in all this but very interested and motivated to get my No-till living soil bed going again, but in a tent this time (due to having a baby, grow room then = babys room now). Trying to place an order on cobkits for some of these parts today if it looks good. Thanks a ton!

1x Driver: Mean Well HLG240H-C2100B
5x COB 3500K: CLU048-1818C4-353M2K1
5x Heatsink: Mecahtronix Star Heat Sink MODULED MEGA 134100-B
5x LED COB Holder: Ideal 50-2204CT
5x Reflector Adapter: Ideal 50-2100AN reflector adapter for Angelina reflector+Citizen CLU048
5x Reflector: LEDiL Angelina reflector F13838 90degree
5x Arctic thermal pads for Citizen CLU048
 
thetr33man

thetr33man

Well-Known Member
glitchsta said:
Hi everyone, this is my first LED build. I am building it for my 3x3 tent. It was a toss up between a LEC light or LED to keep the heat down inside the tent. Looks like I am going the DIY COB route right now. Below is a list of parts I am going to start buying, does it look OK to you guys? I don't want to order the wrong parts. A few questions I have are: Is 3500K the right COB for me? I am going to veg and flower with the same fixture. Will the MeanWell HLG240H-C2100B driver work good to push 5x CLU048-1818? Should I go ahead and order the Star Heat Sinks or wait till someone gets the pin fin heatsinks in stock. Northerngrowlights will have them in stock on 2-10-17 and they are $5 cheaper. Anyone know where to buy the heatsinks? I am planning on doing a build similar to the MAU5-V Grow Kit just with Citizin Cobs instead. Any tips or suggestions on parts to make this build better or cheaper are greatly appreciated as I am a little lost in all this but very interested and motivated to get my No-till living soil bed going again, but in a tent this time (due to having a baby, grow room then = babys room now). Trying to place an order on cobkits for some of these parts today if it looks good. Thanks a ton!

1x Driver: Mean Well HLG240H-C2100B
5x COB 3500K: CLU048-1818C4-353M2K1
5x Heatsink: Mecahtronix Star Heat Sink MODULED MEGA 134100-B
5x LED COB Holder: Ideal 50-2204CT
5x Reflector Adapter: Ideal 50-2100AN reflector adapter for Angelina reflector+Citizen CLU048
5x Reflector: LEDiL Angelina reflector F13838 90degree
5x Arctic thermal pads for Citizen CLU048
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1 hlg-320h-c1400b
4 x COB 3500K: CLU048-1818C4-353M2K1
4 x MODULED GIGA 15250-B ( dissipates same heat weighs half as much and is cheaper)
etc, this will give u more power flexibility, you can dim it way down if you want.

u could use the 240h-1400b with 5 1212s prolly...

1818 3500K90Min 4 COBS @1400 mA ON 1.813 PROFILE HEATSINK
9 SQ.FT. CANOPY 95% EFFICIENT DRIVER @10 CENTS PER KWH
Total power watts at the wall: 306.34
Cobs power watts: 291.02
Total voltage forward: 207.87
Total lumens: 36583.55
Total PAR watts assuming 10% loss: 98.28
Total PPF: 525.27
PPFD based on canopy area: 628.22
PAR watts per sq.ft.: 10.92
Cob efficiency: 37.52%
Power watts per sq.ft.: 32.34
Voltage forward per cob: 51.97
Lumens per watt: 125.71
Heatsink riser thickness / number of fins / fin's length: 0.3in/6/0.95in
Heatsink area per inch: 100.94 cm^2
Total heat watts: 180.44
umol/s/W: 1.80 LER: 335.00 QER: 4.81
Heatsink length passive cooling @120cm^2/heatwatt: 215 inches
Heatsink length active cooling @40cm^2/heatwatt: 72 inches
COB cost dollar per PAR watt: $0.94
Electric cost @12/12 in 30 days: $11.03
Electric cost @18/6 in 30 days: $16.54
Cost per cob: $23.0
Heatsink cost per inch cut: $0.66
Total cobs cost: $92.0
Total heatsink passive cooling cost: $141.90
Total heatsink active cooling cost: $47.52
 
G

glitchsta

Member
So your saying I should get the hlg-320h-c1400b driver and run 4 cobs? Will that driver run 5 1818 cobs too? Or should I just run 4 cobs? Would that be enough light for a 3x3? How did you get that spec list, is there a calc somewhere? Basically what would you do for a 3x3 tent? Just got my taxes back and I am ready to buy =p Thanks man...

I just found http://timbergrowlights.com/300-watt-citizen-clu048-3x3-framework/ now I am wanting 6 cobs =p they sell that driver with their 300 watt kit. They use 1212 cobs but arent the 1818 alot better? Look ok to you guys?
 
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C

Cortezh

Active Member
visajoe1 said:
VO- voltage
io- current

Keep voltage 100%
adjust current only

I have that driver, dig it
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So I think I got this right someone correct me if I'm wrong lol. Wiring the 4 Citi 1212s in series with the hlg 185 48a driver and adjust my current down to 1080ma? Keeping the voltage at 48?

Or do I wire in parallel and adjust the voltage to around 24v to get me at the 38w each cob mentioned on cobkits site?
 
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sixstring2112

sixstring2112

Well-Known Member
visajoe1 said:
This.
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I dont think your right here.this driver is best for parallel wiring and also 50v cobs.i think the cobs will see 4.8amps if wired in series but i could be wrong. Using parallel and 4 cobs would split the amps down to a reasonable level but i still think theres too much voltage on this particular driver.
 
Abiqua

Abiqua

Well-Known Member
Cortezh said:
So I think I got this right someone correct me if I'm wrong lol. Wiring the 4 Citi 1212s in series with the hlg 185 48a driver and adjust my current down to 1080ma? Keeping the voltage at 48?

Or do I wire in parallel and adjust the voltage to around 24v to get me at the 38w each cob mentioned on cobkits site?
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Neither.....

You need minium voltages if going 36 or 50v.

Wiring in series, adds voltages and keeps the same current. The meanwell hlg 185-48b needs to be wired in parallel for cobs to work, voltage is same across the diodes, but add current.

A led will not take unlimited voltage, but in theory it will take unlimited current until it goes kablooey....wiring in parallel with voltage limiting can help all this....and also why wiring in series with a CC driver is also used, limited current basically.
 
CobKits

CobKits

Well-Known Member
its not *best* for parallel wiring, its *only* parallel wiring unless youre putting (4) 12V cobs in series

Cortezh said:
Or do I wire in parallel and adjust the voltage to around 24v to get me at the 38w each cob mentioned on cobkits site?
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1212s will not light up at 24V (nor does the driver adjust that low). you need a minimum of 31-32V to even barely light them and will usually be 34-37V. if the driver is in excess of that voltage, then current control will dictate how much power the cob draws.

upload_2017-1-28_14-47-48.png

a high voltage constant current driver will always be in excess of cob voltage, but it controls where the cob operates on that curve by limiting current to 700,1050, 1400, 1750, etc depending on model. in your case, the low voltage high current HLG-48A driver has 4.2A to work with.

if you hook it up to one cob, it will give it all 4.2A and blow it up
if you hook up 2 cobs in parallel, it will give each one 2.1A
3 in parallel, 1400 mA
4 in parallel, 1050 mA
5 in parallel, 840 mA
etc

the more cobs you hook up, the lower the voltage you'll see across the cobs (approximately on curve above. 2 cobs at 2.1A will be 38.1V, 4 cobs at 1050 mA will be 36V).

36A would be a better match as a constant voltage driver but you cant find them as cheap as the 48As i have, and they work fine
 
S

Sirpaxalot

Member
licoricetree said:
How are you arranging them?
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thetr33man said:
Personally I wouldnt mix spectrum on a single driver. Wouldnt be horrible to have 2 drivers in a grow area tho, one with 4000k cobs for veg and then add another driver and cobs with 3000k or 2700k cobs for flower...
Click to expand...
I have the 5 35ks running on a 240-1400 and the next 4 will be on a 185-1400. I have the 35ks in the 4 corners and 1 in the middle. I'm adding the next 4 to fill in the 3x3 grid of lights. Also the drivers are ran remotely outside of the tent.
 

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