Introducing CobKits.com - specializing in DIY and Citizen COBs

[DrBlaze]

Hey Bobby, I'm looking to order some components in a couple weeks or so, and want to get them from you. I'll be lighting a 4x4 scrog, but will be on a bit of a budget, so I thought that 4x1825 driven at 150w (approx 50% efficient) seemed like a good value proposition. Also, I could add more cobs later on if I wanted more efficiency.

However, I remembered an experiment you did a while back where you wired multiple 1212's together on the same heatsink. So I redid the numbers using 4x1212's per heatsink, running at the same 150w per heatsink, and it looks like they'd produce more par and be fair bit more efficient (55-56%) for not much more in cost.

The only thing is how to cool them. It looks like you have only 1 pin heatsink that will accept a fan, and its not very beefy. Are there any other types you can get in? (A square one would be perfect ) Also I'm a little unclear on the best drivers to use... there seem to be a couple different ways this could be wired up and I'd like your opinion on which way you think is best. Also, do you favor using 1 large 600w driver or 2x300w+ drivers?

Thanks

 

[Lordhooha]

Hey Bobby, I'm looking to order some components in a couple weeks or so, and want to get them from you. I'll be lighting a 4x4 scrog, but will be on a bit of a budget, so I thought that 4x1825 driven at 150w (approx 50% efficient) seemed like a good value proposition. Also, I could add more cobs later on if I wanted more efficiency.

However, I remembered an experiment you did a while back where you wired multiple 1212's together on the same heatsink. So I redid the numbers using 4x1212's per heatsink, running at the same 150w per heatsink, and it looks like they'd produce more par and be fair bit more efficient (55-56%) for not much more in cost.

The only thing is how to cool them. It looks like you have only 1 pin heatsink that will accept a fan, and its not very beefy. Are there any other types you can get in? (A square one would be perfect ) Also I'm a little unclear on the best drivers to use... there seem to be a couple different ways this could be wired up and I'd like your opinion on which way you think is best. Also, do you favor using 1 large 600w driver or 2x300w+ drivers?

Thanks

I planning on liquid cooling my light I'm gonna build here soon.

 

[Millsie]

Hey Bobby, I'm looking to order some components in a couple weeks or so, and want to get them from you. I'll be lighting a 4x4 scrog, but will be on a bit of a budget, so I thought that 4x1825 driven at 150w (approx 50% efficient) seemed like a good value proposition. Also, I could add more cobs later on if I wanted more efficiency.

The only thing is how to cool them. It looks like you have only 1 pin heatsink that will accept a fan, and its not very beefy. Are there any other types you can get in? (A square one would be perfect ) Also I'm a little unclear on the best drivers to use... there seem to be a couple different ways this could be wired up and I'd like your opinion on which way you think is best. Also, do you favor using 1 large 600w driver or 2x300w+ drivers?

Thanks

Personally I'd build two separate light bars w/ 2 x 1825's and a HLG320-2800, this would allow more canopy management - IceLed makes some pretty good 100w+ cooling solutions

How many 1212's were you thinking going to go with? Could be a more idea solution in a scrog

I planning on liquid cooling my light I'm gonna build here soon.

How were you going to watercool the cobs, are you going to have a chiller or a radiator?

 

[Lordhooha]

Personally I'd build two separate light bars w/ 2 x 1825's and a HLG320-2800, this would allow more canopy management - IceLed makes some pretty good 100w+ cooling solutions

How many 1212's were you thinking going to go with? Could be a more idea solution in a scrog



How were you going to watercool the cobs, are you going to have a chiller or a radiator?

I've been playing around with an old closed loop system from one of my old pc's I e built in the past, but likely just use a radiator. I'm gonna check out ice and see what they have.

 

[OLD MOTHER SATIVA]

I told the last company that shipped to me DHL I'd sue them........ those assholes shouldn't even be in business!! They were worthless when they were Airbourne Express too, that's why they changed their name and bailed from the USA........ I'll tar and feather the next DHL driver showing up at my door..................grrrrrrrrrrrrrrrr

rant over sorry.

OverseaS SHIPPING? Fedex all the rest are more trouble than they are worth. I use to ship a lot of computer stuff BACK to China, didn't take long top learn to use Fedex

i have had great success with dhl from china

 

[DrBlaze]

How many 1212's were you thinking going to go with?

Sorry, I thought that was more clear. 16, 4 per heatsink.

 

[mx5spd]

Agree that reading is essential for these builds. Although questions asked in this thread serve as an open custom service conversation. It helps when others can read previous answers. Maybe a FAQ tacked as first post would help.

 

[CobKits]

maybe a site where we could edit first post....

 

[HolyGhost23]

id ask for help ,but i always ask how they figured out the answer. id much rather know how to figure out or do something myself. rather than just be fed an answer..also my answer may not be the best answer..hence why i ask for opinion.

 

[Abiqua]

Agree that reading is essential for these builds. Although questions asked in this thread serve as an open custom service conversation. It helps when others can read previous answers. Maybe a FAQ tacked as first post would help.

How many members have tried that and been given ad hominem excuses? Lots

 

[Abiqua]

maybe a site where we could edit first post....

You could a build a website and tack on some real forums like BBS.

 

[Victor6634]

id ask for help ,but i always ask how they figured out the answer. id much rather know how to figure out or do something myself. rather than just be fed an answer..also my answer may not be the best answer..hence why i ask for opinion.

First of all I asked for an opinion I did not ask for some one to figure it out for me if you want to be an asshole go right ahead seems to me you are a know it all.
Second I asked in here because I bought the the 32 cobs from cobkits and figured since he has more experience than me but he never answered instead he made excuses for you so with that being said I will take the rest of my business to northern grow lights since he would rather make excuses for you being an asshole instead answering the question of a customer further more if you did not want to give me an opinion on the driver you should have just kept your mout shut instead of being a total dickhead I'm sure someone helped you but I guess your to good to help someone else so with all that said have a nice day and go fuck yourself

 

[whitebb2727]

@CobKits

Can you get Dc to Dc drivers? I saw meanwell has some listed. I was thinking about putting in some solar and a few batteries. Dc to dc I would'nt have loss of efficiency like I would with ac to dc driver off the solar.

 

[whitebb2727]

@CobKits

Can you get Dc to Dc drivers? I saw meanwell has some listed. I was thinking about putting in some solar and a few batteries. Dc to dc I would'nt have loss of efficiency like I would with ac to dc driver off the solar.

Something like this.


https://www.elpro.org/gb/2699-dcdc-led-driver-step-up-converter

Maybe it would be better to run step down? I figured it would be easier to use the step up as the smaller solar panels are 12 or 24 volt.

I could build a larger voltage system if stepdown is better. I figure with step down I would get longer run times off the batteries.

 

[CobKits]

First of all I asked for an opinion I did not ask for some one to figure it out for me if you want to be an asshole go right ahead seems to me you are a know it all.
Second I asked in here because I bought the the 32 cobs from cobkits and figured since he has more experience than me but he never answered instead he made excuses for you so with that being said I will take the rest of my business to northern grow lights since he would rather make excuses for you being an asshole instead answering the question of a customer further more if you did not want to give me an opinion on the driver you should have just kept your mout shut instead of being a total dickhead I'm sure someone helped you but I guess your to good to help someone else so with all that said have a nice day and go fuck yourself

you should reread that post, i was actually defending you.

And I wasnt blowing you off im coming off a 20+ hour shift at the real job so i havent been on here for a day, im behind on all questions

 

[CobKits]

now to your question

Looking for some suggestions on how many citi 1818s I should use for half of my room which would be a 4x8 and which driver hlg 240-1050 or a hlg320-1400 I want to mount them as a single 4cob bar I am going to end up with 8 bars how many should I use any suggestions or ideas greatly appreciated trying to get best ppfd possible. Than I will be going cobs for the rest of the room if I like the results which will be 5x9

im not quite clear from what you wrote but it sounds like you want to put ( 8 ) 4-cob bars over a 4x8? or is it ( 8 ) 4-cob bars over a 4x8+ 5x9?

in the first case (32 cobs in 32 square foot), 40W/ cob would be fine and 1212s would actually work about as good in that range

if you want to do 4x8 and 5x9 with 32 cobs thats 77 square feet so 77sfx40w/sf / 32 cobs = 96W per cob. 1818s could do that, your bars would almost certainly require fans

hope that helps

 

[BobCajun]

First of all I asked for an opinion I did not ask for some one to figure it out for me if you want to be an asshole go right ahead seems to me you are a know it all.
Second I asked in here because I bought the the 32 cobs from cobkits and figured since he has more experience than me but he never answered instead he made excuses for you so with that being said I will take the rest of my business to northern grow lights since he would rather make excuses for you being an asshole instead answering the question of a customer further more if you did not want to give me an opinion on the driver you should have just kept your mout shut instead of being a total dickhead I'm sure someone helped you but I guess your to good to help someone else so with all that said have a nice day and go fuck yourself

I would use the hlg240, one cob per square foot, so 8 sets of four for the 4x8 space.

 

[Victor6634]

I would use the hlg240, one cob per square foot, so 8 sets of four for the 4x8 space.

Thank you I appreciate the response

 

[Victor6634]

now to your question



im not quite clear from what you wrote but it sounds like you want to put ( 8 ) 4-cob bars over a 4x8? or is it ( 8 ) 4-cob bars over a 4x8+ 5x9?

in the first case (32 cobs in 32 square foot), 40W/ cob would be fine and 1212s would actually work about as good in that range

if you want to do 4x8 and 5x9 with 32 cobs thats 77 square feet so 77sfx40w/sf / 32 cobs = 96W per cob. 1818s could do that, your bars would almost certainly require fans

hope that helps

you should reread that post, i was actually defending you.

And I wasnt blowing you off im coming off a 20+ hour shift at the real job so i havent been on here for a day, im behind on all questions

sorry I must of misread it or misunderstood

 

[Victor6634]

now to your question



im not quite clear from what you wrote but it sounds like you want to put ( 8 ) 4-cob bars over a 4x8? or is it ( 8 ) 4-cob bars over a 4x8+ 5x9?

in the first case (32 cobs in 32 square foot), 40W/ cob would be fine and 1212s would actually work about as good in that range

if you want to do 4x8 and 5x9 with 32 cobs thats 77 square feet so 77sfx40w/sf / 32 cobs = 96W per cob. 1818s could do that, your bars would almost certainly require fans

hope that helps

For now I am going to be running the 32 1818s in a 4x8 part of my room to see how they produce. The 5x9 I am currently using 2 nanolux de lights. Will be switching the 5x9 part to cobs if I like the results from the cobs. I was looking at the ice led heatsinks just in case I want to upgrade the 1818s later