Introducing CobKits.com - specializing in DIY and Citizen COBs

hi
Does cxm22 can run 75w at good efficiency ?
Do you think Mechatronics Mega 134100 (diss 75w) could run it ?

Yes and yes

Can you beat digikey prices on the luminus cxm22 gen3? I buy 25 at a time which is £12.42 (roughly $16) each with free p&p to the uk.

the free shipping is the stickler, i dont have access to their shipping options so its hard to match that

i can do it in the states but international is tough.

im looking into DHL which might help that, give me a few days

No problem, i might have some of the 1818s off you too as i cant get them in the uk cheap.Ill email you later.

Hey COBKits! Let me ask you this: why do you seggest to get CXM22 instead lf Citizen CLU048? I'm trying to understand better all this COB thing; I just want to understand better

depends which clu048 you are asking about

for a few dollars more its considerably more efficient than 1212

for a few dollars less it is as efficient as 1818

When i took apart my panels i tore down 1 connector if that's what it's called on my Citizen CLU048-1212C4. I am talking about the small metal plate that are on the side of '+' and '-' that you solder onto. Can it be fixed? I tried soldering without it and the solder just falls down.

post a pic not exactly sure what you mean. if youre talking about the solder pad on the chip itself thats irrepairable as the leads to the array from there are tiny and not solderable

You got what i meant. I ripped it and couldn't solder it back so I figured it's done deal just wanted to confirm.
Thanks for the answer, i know this is not the thread for it but i have one more question because i see you are knowledgeable and the thread i posted just got lost.

So last few runs with my DIY COBs i had my drivers on the floor in the corner of the room. Now that I moved I divided my panels into few smaller ones.

What is in your experience best place for drivers and why? Did you put your drivers on the panel or somewhere on the side?

Once again thank you for the anwser.

put it on your keyring

High Above said:

What is in your experience best place for drivers and why? Did you put your drivers on the panel or somewhere on the side?

Click to expand...

up off the ground out of your way, either on the fixture or if mounted remotely not too far from cobs (~12 feet)

100K pots back in stock

http://cobkits.com/product/bourns-100k-potentiomenter/

As someone that doesn't know much about COB, but is interested, I'd like to see a kit, or something that helps tie together all the parts needed. Like if I were buying a computer, I'd need a monitor, keyboard, mouse, etc. It's kind of tough to figure out what all is needed. Would be cool if there were a kit for a complete COB.

Googling around, I see the CXB3590 is popular and it looks like most people buy the 36v version? So I assume we start here-
cree-cxb3590-36v

(sorry, site won't let me post links)

For heatsinks, there are a couple that say they're for the 3590 and in the first page you seem to like the 140mm, so I assume this is good-
cree-cxb3590-36v

For holders and reflectors, the descriptions lead me to these think these three are needed-
ledil-angelina-reflector-f13838-for-ideal
ideal-holder-for-cxb3590-series
ideal-50-2300an-reflector-adapter-for-angelina-reflectorcxb3590

Then maybe this for the thermal pad-
arctic-thermal-pads-for-cree-cxb3070 (dunno why it says 3070 in the url, product says it's for 3590)

Do we need paste too, or is it either/or?

Are those all the parts needed to make one complete COB?

And what is the wattage? Second page of the datasheet looks like 3600ma, or 3.6a, which is about 130w at 36v...is that right? Each one is 130w? But page 11 looks like it depends on temp and 77F to 221F equates to about 70w to 97w, at 36v. Do we assume halfway at ~85w?

For the driver, the description (and price) lead me to this one- meanwell-hlg-185h-36a-driver but it says that any number of COB's can be added later on. There must be a limit..? This one is more than I want to spend- meanwell-hlg-600h-36b but it's nice that it tells you how many you can power with it. How many can be powered with the first one?

Anyway, I love the website and products are very intriguing, but it's tough to figure out what to order if you're not savvy.

mooray said:

Googling around, I see the CXB3590 is popular and it looks like most people buy the 36v version? So I assume we start here-
cree-cxb3590-36v

Click to expand...

lets back up

those links are dated

a lot less doing new builds with cree these days as there are better cheaper options, i dont even sell them anymore

but lets continue on your 36V journey

mooray said:

For holders and reflectors, the descriptions lead me to these think these three are needed-

Click to expand...

you dont need reflectors, just the holders. some peopel use reflectors

mooray said:

Do we need paste too, or is it either/or?

Click to expand...

either or

mooray said:

And what is the wattage? Second page of the datasheet looks like 3600ma, or 3.6a, which is about 130w at 36v...is that right? Each one is 130w?

Click to expand...

maximum. few growers run them that hard as they are a lot less efficient at higher currents and temps

mooray said:

But page 11 looks like it depends on temp and 77F to 221F equates to about 70w to 97w, at 36v. Do we assume halfway at ~85w?

Click to expand...

25-75W is popular for 36V cobs

in general it can be said that 700mA-2100 mA is popular for any cob

mooray said:

For the driver, the description (and price) lead me to this one- meanwell-hlg-185h-36a-driver

Click to expand...

yes that is an option for parallel wiring cobs

mooray said:

but it says that any number of COB's can be added later on. There must be a limit..?

Click to expand...

100? whatever the minimum is to light up a cob. in any case your 200W splits out amongst cobs 4@50W, 10@ 20W, 100@ 2W, etc

mooray said:

Anyway, I love the website and products are very intriguing, but it's tough to figure out what to order if you're not savvy.

Click to expand...

start here, at the beginning

https://www.rollitup.org/t/diy-leds-how-to-power-them.801554/

thats a good place to ask general questions as you learn (not that this is a bad place- but more traffic there)

Awesome, thanks for taking the time! What I really wanted to do was put together ~100w 4-light frame as an addendum to my 315w lec, which meant trying to find 25w sources. It sounds like I can do that here, but with the bonus of being able to crank them up should I end up using it elsewhere. I much prefer it when pieces of the kit are versatile, so that's great.

That's a big thread, but I'll start sifting through. Thanks again.

any cob can be run as low as 25W but the differences in efficiency at that wattage is minimal. you could pay 2-5X as much for a 'better' cob for little to no gain so more cheaper/smaller cobs is a good bet in that range

Just bought 4 of the cxm22 3500k light engines and hlg320-1400b. Looking forward to seeing it run. Thanks again for all the help @CobKits

you forgot your wagos!

ill throw them in

I'm probably going to solder them, and I can get a 100k pot from my dad.... I think.

ill still send the wagos

try them

if you want to solder after that the wagos are reusable