Cheap and Cheerful DIY using Citizen cobs

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frisson123

New Member
Ey guys..

Been trawling these forums for a little while, planning my own setup, I would be very grateful for a little advice?

I'm looking at setting up two tents, one a while after the other.

First tent - 3.3' x 6.5' (1m x 2m tent)
Second tent - 4'x4'

My main question is what kind of Citizen setup would give me most bang for my buck? whilst keeping temps down and light output high, the extra cost for more 1212's to be setup seems less attractive compared to a 1818 where I could use less cobs?

I'm looking at roughly 1000w or a little more if needed for the lights all together, is this a sensible figure considering I would like to maximize my yield potential?

Bottom line just like anyone else is the setup costs vs output, I'm looking for the COB setup that's best value for money at the moment.

I appreciate any advice! Thanks people.
 
DarthPlagueis

DarthPlagueis

Well-Known Member
CobKits said:
the holes go all the way thru, part of the extrusion. you can tap or use M3 self tappers to mount on top
Click to expand...
I feel they won't sit as flush as the others with tapped holes on the side(like yours). With the holes on the side, you can have the heatsinks sit nice and tight on angled aluminum. Only thing I need now are heatsinks
 
B

Baura

Well-Known Member
CobKits said:
id go 3000k or 3500k for veg+ bloom.
if you can tolerate stretching, 90 cri
if youre stretch sensitive, 80 cri
the below bbl are less in both lumens and par, but the par deficit is not as big of a difference as the lumens,
Click to expand...
I may be high but ; the commas and dots suggest one thing.
At least here on the cell phone, the spacing(new lines) suggests the opposite....

For a super space bucket, actually a 300L tonel, low stretch is good.

For veg and bloom, 4000k@90cri is ok? Or not enought 660?

Cheers
 
G

greenballs

Member
first 2 pics are cob side of heatsink. the other pic is the top/back of heatsink.

these are the MODULED GIGA 152100-B-HBG.
150 high by 100 wide
weight 1.5kg.

gona run the cobs around 90watts so needed a bigger hsink than the pin fins available,
as the pin fins available are really only able to handle up to 80watts.(I think)
 

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G

greenballs

Member
DarthPlagueis said:
Yeah I second that, post a pic when you can. The only reason I would rather get them from ngl or cobby is because of the side mounting holes on the pin heatsinks, they give a real clean look to them, but if the mechatronix ones can be set up like in the growmau5 video I posted above then I might give them a shot!

How much was shipping?
Click to expand...
shipping was 160 dollars for 20kg (45lbs) fed express, to eu.
2 packages.
just received tax and duty invoice from fed ex. 135 euros. oouch.

yeah there is no holes on the sides. but they do hav tapped holes on the top n bottom near the edges which would do the same job.
im gona use box or u-aluminium along the top middle of hsink rather than 2 L's at the sides.
but either would work.
maybe L-aluminium wud suit better as then a reflective material can be easily put between hsinks.
 
CobKits

CobKits

Well-Known Member
greenballs said:
first 2 pics are cob side of heatsink. the other pic is the top/back of heatsink.

these are the MODULED GIGA 152100-B-HBG.
150 high by 100 wide
weight 1.5kg.

gona run the cobs around 90watts so needed a bigger hsink than the pin fins available,
as the pin fins available are really only able to handle up to 80watts.(I think)
Click to expand...
for the cost/weight of those id go with 99mm active iceleds. those giga are monsters
 
DarthPlagueis

DarthPlagueis

Well-Known Member
greenballs said:
shipping was 160 dollars for 20kg (45lbs) fed express, to eu.
2 packages.
just received tax and duty invoice from fed ex. 135 euros. oouch.

yeah there is no holes on the sides. but they do hav tapped holes on the top n bottom near the edges which would do the same job.
im gona use box or u-aluminium along the top middle of hsink rather than 2 L's at the sides.
but either would work.
maybe L-aluminium wud suit better as then a reflective material can be easily put between hsinks.
Click to expand...
Ouch, that's a decent amount for shipping tax, I hope my cobs that I ordered are not taxed here in the US. I'm actually going to wait, another member has my order saved so when they get a new stock they will hold them. I prefer the look of the pin heat sinks, they look nice idk. But good luck on your build, post pictures when you are done!
 
G

greenballs

Member
CobKits said:
for the cost/weight of those id go with 99mm active iceleds. those giga are monsters
Click to expand...
yeah looked at those put i didn't want more fan noise or more watts not going to photons.
plus less moving parts (none) so less to go wrong, hopefully.

the thermal resistance of your hsinks. is the watts revering to led watts or heat watts?
 
G

greenballs

Member
DarthPlagueis said:
Ouch, that's a decent amount for shipping tax, I hope my cobs that I ordered are not taxed here in the US. I'm actually going to wait, another member has my order saved so when they get a new stock they will hold them. I prefer the look of the pin heat sinks, they look nice idk. But good luck on your build, post pictures when you are done!
Click to expand...
yeah and my cobs and drivers are prob gona be double the import tax, as nearly double the value.
u should be fine tho, as long as ur buying from the same country that u live in, there wont be any import tax.
 
M

Mojave

Well-Known Member
I'm thinking of running 6 to 8 Citi 1212's at 80w a piece. What driver(s) should i look to use? Or should i just step up to a bigger cob like the 1818? I'll be going with watercooling.
 
R

rocho

Well-Known Member
Hi to everybody. Do you have any suggestion about the COB s distribuition? I have 5 COBs without lens and reflecor (clu 048 1212) run at 25-50w in a 2.7x2.7tent..i would to avoid hotspot but i do not know distributiin and spread from those cobs.

Would also make the arctic64 plus less noiser, i d like to use pwm ac driver to dimm the 4pin fans..is it possible in your opinion?
Hoping in an answer

Best regards.
 
DarthPlagueis

DarthPlagueis

Well-Known Member
rocho said:
Hi to everybody. Do you have any suggestion about the COB s distribuition? I have 5 COBs without lens and reflecor (clu 048 1212) run at 25-50w in a 2.7x2.7tent..i would to avoid hotspot but i do not know distributiin and spread from those cobs.

Would also make the arctic64 plus less noiser, i d like to use pwm ac driver to dimm the 4pin fans..is it possible in your opinion?
Hoping in an answer

Best regards.
Click to expand...
 
shadow_moose

shadow_moose

Well-Known Member
rocho said:
Hi to everybody. Do you have any suggestion about the COB s distribuition? I have 5 COBs without lens and reflecor (clu 048 1212) run at 25-50w in a 2.7x2.7tent..i would to avoid hotspot but i do not know distributiin and spread from those cobs.

Would also make the arctic64 plus less noiser, i d like to use pwm ac driver to dimm the 4pin fans..is it possible in your opinion?
Hoping in an answer

Best regards.
Click to expand...
Poster above me gave you a good configuration. Yes you can "dim" fans, a fan controller designed for use in PCs would probably work really well for this. Consider the fans may not actually really get quieter, though. A lot of the noise from those arctic coolers comes from the bearing housings anyways.
 
R

rocho

Well-Known Member
hi! that's exatly was i had on mind when i choose a 5 cobs lamp but i can't understand quite nothing because of my bad english Furthermore somewere i read that cobs have a sort of of lighting camp range...for example 30cm of light at 1 meter from the ground...i would not to put the cobs too closer each other getting too much light in a side and too little in other...I don' t know if there's some rule to get a good compromise if not the perfect setting for my grow space..maybe cobkit has some interesting data from citizen cob.

About fan noise: is it a problem of arctic64 plus or also from other cpu heatsink like alpine11 by the same brand?
in the attached file the configuration i have on my mind, 55x55 cm(1.8 feet) could be a fine distribution for a 2.3 tent?
Many thanx for your help!
 

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R

rocho

Well-Known Member
thats the Mau5 style (50x50) 1.8x1.8 feet size...are the cobs too closer between each other(25 cm- 0.82 feet) ot that's fine?
 

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Metacanna

Metacanna

Well-Known Member
I want to build my COB lights, there's too much information around, it's hard work to put all pieces together.

1 - I want to use 5x 1212 running at 50W. Which driver should I use?

2 - CRI 80 or 90, since there's a lot of theory behind CRI let's put it this way, which yield more gram per watt wise?

3 - Can I save some money on the cob holders and screw it directly on the aluminium? Ok ok, I won't save on the thermal grease.
I understand holders are good to unsure maximium contact with the heat sink, worth every cent? Hope not...

4 - Heat sink. The heat sinks I see people recommending for "small" COBs like the 1212 seems to me a bit overkill. When I open my pc case and look inside, the CPU (90w consumption) and graphic card produce considerable ammounts of heat, still, manufacturers installed much smaller heat sinks.
What would justify using massive heat sinks on COBs and saving on tiny CPU heat sinks that easily pulls the same as the 1212 or even 1818.
I know nothing, I'm just trying to get grasp on this.
What really bothers me is price of those heat sinks, otherwise I would just buy them and save time.

I'm sure the bigger the heat sink, better. Would this work and keep some efficiency on the 1212?

Untitledgfg.jpg

It's thick aluminium, 25mm x 100mm x 70mm. I wonder if one these per COB running at 50w would be enough.
 
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