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Best COB maximum Vf 34V?

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CoqueKoke

New Member
I have an output 190V driver, with 3 cobs x52v = 156V.
I would like to plug another cob, so 190-156= 34V.
CXB3070 - 36V :(

Any better option than vero18???
Thanks
 
S

Shugglet

Well-Known Member
What driver, what cobs?

There is no 50v vero18 or cxb3070 for that matter.
 
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CoqueKoke

New Member
I already have 3x bxrc-30e10k0-b-73 (52x3=156 V) with a hlg-185h-c1050b driver(190V).
I am thinking to add another cob, but with 34V (190-156) or less i cant find a better one than a vero18 bxrc-35e4000-d-73 (29V).
Is there another better choice for that extra cob? Cxb3070bb and bxrc-30-10k0-d-73 both are 36V, so i will miss to get one of these good ones for just 2V :(
 
Rahz

Rahz

Well-Known Member
CXB3590 at 1.05 amps typically will draw just under 34v
The 3070 at 1.05 amps will typically draw just under 35v
 
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CoqueKoke

New Member
How do you see that? What about 30e10k0-d-73?

Vero18 30e4000-c-73 seems to be 34.1

What about bxrc-30e10k0-b-73 @1.05??? Maybe i can add the cxb3590 or 30e10k0-d-73?? That would be so nice XD
 
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Shugglet

Well-Known Member
FYI st that current your cobs will take about 50v a piece.

Any cob under 40v will be fine. just add a 29D if you want another cob. Plan bether in advance next time to avoid things like this
 
Rahz

Rahz

Well-Known Member
CoqueKoke said:
How do you see that? What about 30e10k0-d-73?

Vero18 30e4000-c-73 seems to be 34.1

What about bxrc-30e10k0-b-73 @1.05??? Maybe i can add the cxb3590 or 30e10k0-d-73?? That would be so nice XD
Click to expand...
The emitter datasheets have charts that detail the voltage -vs- current. So you can see the voltage for any particular current in the curve.
 
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CoqueKoke

New Member
Yes! finally i saw the charts! @1050mA, each 30e10K0-b-73 less than 50.5V
30e10K0-d-73 @1050mA => less than 36.75V.
Then 3x 50.5 + 36.75 = 188,25V < 190V
I will get the 30e10K0-d-73 as an extra cob XD

i decided to get just 3 COB's, and bought all two days ago. Today i decided to put another one XD

Thanks all! It will fit perfectly the driver :)
 
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goofy81

Well-Known Member
So its perfectly fine to mix COB brands on same driver?
I can't see any issues with it besides one cob being brighter/dimmer than the others.
 
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CoqueKoke

New Member
the brand is the same, Bridgelux, i think it will work (even it is another brand), in the end is just a circuit with 4 leds, 190V is enough to make them ON, so i hope it will work great.

Of corse there must be difference between B capsule and D one, % efficiency cause of current can make B to bright more than D one maybe? but it's light in the end XD of corse you can get a better set up for sure with 4 same leds :) but i already had the driver and leds, so its fine for me
 
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