Introducing CobKits.com - specializing in DIY and Citizen COBs

ilam

ilam

Member
Hey @CobKits !!
Writting to let you know i finally placed my first order from your site today. I ordered 2 1212's and a few other components to start my experiments and learning experience. Thanks for sourcing all of this for us, you rock!

Btw, i'm already doing the math for my next build, and i'm wondering if a HLG 185 could run just 2 048-1818s?

I'm thinking on making a 4 cob setup. Passively cooled with 2 HLG's 185 running 2 1818's each @ ~100watts each... If my math is right, this should blast me around 1050 PPFD @ 12'' in a 3 by 3 tent if evenly distributed. What do you think?
 
CobKits

CobKits

Well-Known Member
they'll be close to 112W each but yeah it would work fine. 450W is on the upper end of what you need for a 3x3 but nothing wrong with that :bigjoint:

expect to use active cooling

4 1818 light engines would get it done with cooling to spare
 
G

greengrassgrower1

Well-Known Member
Question for you Cob,

First off I am a total noob to COB LEDs. So any input would be much appreciated. So far i have ordered 4 of the 48 -1212 with holders and reflectors, and 2 of the HLG185H-48A.. I have the passive heatsinks worked out already. My first light will consist of one driver and the 4 - 1212s. My second light will consist of the other 185-48A driver and 4 of the 48-1818s. My question is related to the driver out put when using the different COBS.

At running 4 of the 1212 why will i only be using 152W @ 38Ws PER cob?, Compared to 4 of the 1818 same driver but now at 220w @ 55Ws per cob? With the little i know i see no benefits of using the 1212s and this Driver for future builds, beside the 13 dollar savings per cob.. Also i am trying to figure out the math on the output of this driver as it relates to each Cob in milliamps. Driver output 48v @ 3.9 amps so how do i find out the milliamps per COB?

Cheers,
 
pop22

pop22

Well-Known Member
Hey! Wanted to say thank you! Got my light engines this morning. Nice work! Now I just to decide on a driver. I've got a HLG-H185c-1050b I may use. I want to run them a bit harder those, maybe in the 75watts range. These will go into a tent with that has a too blue, chinese clunker so my Ducksfoot can have some decent light!
 
pop22

pop22

Well-Known Member
your driver is constant voltage. The 1212 chips run at nominal 36 volts, the 1818 runs at about 50 volts. The current is not constant, its divided among the chips. 4 chips dividing up 4.25 amps each gives you the wattage. so for the 1212 you'd have 36vx 1.065a. For the 1818 you have 50v x 1.065a.

greengrassgrower1 said:
Question for you Cob,

First off I am a total noob to COB LEDs. So any input would be much appreciated. So far i have ordered 4 of the 48 -1212 with holders and reflectors, and 2 of the HLG185H-48A.. I have the passive heatsinks worked out already. My first light will consist of one driver and the 4 - 1212s. My second light will consist of the other 185-48A driver and 4 of the 48-1818s. My question is related to the driver out put when using the different COBS.

At running 4 of the 1212 why will i only be using 152W @ 38Ws PER cob?, Compared to 4 of the 1818 same driver but now at 220w @ 55Ws per cob? With the little i know i see no benefits of using the 1212s and this Driver for future builds, beside the 13 dollar savings per cob.. Also i am trying to figure out the math on the output of this driver as it relates to each Cob in milliamps. Driver output 48v @ 3.9 amps so how do i find out the milliamps per COB?

Cheers,
Click to expand...
 
Evil-Mobo

Evil-Mobo

Well-Known Member
Do the Khatod lenses work with these?

Feel free to pm me for further discussion this interest me as I was thinking 1825 as well it matches to the 3590's I'm running on the other side at 75w each too.
 
J

joker1961

Active Member
hey cob kits can you answer a ? whats the advantage of going with the 1825 over the 1818 if i drive them both at 3 1825@ 73.3W each (220W max) or 3 1818@ 75.3W each (226W max) would the 1825 be much better than the 1818? thanks
 
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