COB Manufacturers other than CREE or BRIDGELUX

Which led brand /manufacturer do you use ?

  • cree

    Votes: 98 58.0%

  • bridgelux

    Votes: 48 28.4%

  • sharp

    Votes: 1 0.6%

  • osram

    Votes: 4 2.4%

  • nichia

    Votes: 9 5.3%

  • toyonia

    Votes: 0 0.0%

  • citizen

    Votes: 32 18.9%
  • Total voters
    169
nevergoodenuf

nevergoodenuf

Well-Known Member
I just got some more info on the Citizen CLU550. This COB is looking better and better, every time I look at it. The only thing that suck is the voltage @ 104v. The HLG120 x2 puts it at 300 watts. I just ordered 8 HLG120H-C1050b. This will keep my max under 300 watts. Also am getting some precut TIM. I also have CDIWebs VP of Sales looking for more cooling options for 200 watts+ COBs.

EQUATIONS

Heat to Remove (W) = Input Power to COB (W) x [1 - Light Extraction Efficiency (%)]

Light Extraction Efficiency (%) = [0.0029 x Efficacy (lm/W)] + 0.0097

△T (desired) = Tc – Ta (desired case – ambient)

△T (heat sink) = Heat to Remove (W) x [Rth (heatsink) + Rth (TIM)]

Tc (actual case) = △T (heat sink) + Ta (ambient)

Tj (actual junction) = [Input Power to COB (W) x COB Rj-c] + Tc (actual case)


EXAMPLE ASSUMPTIONS

Citizen CLU550-3626C1-40AL7G4

Total Drive Current (into both channels) = 2400mA

Forward Voltage = 103.8V

Input Power to COB = 249.2W

lm/W = 144

Tj = 90°C

Rj-c = 0.1°C/W

Tc(max) = 105°C

Tj(max) = 140°C

MechaTronix CoolBay Tera-A

Rth = 0.22°C/W

Laird Technologies TPCM585-ZHA

Rth = 0.1°C/W

Tc (desired) = 65°C

Ta (ambient) = 27°C

EXAMPLE CALCULATION

Light Extraction Efficiency (%) = [0.0029 x 144] + 0.0097 = 42.73%

Heat to Remove (W) = 249.2 x [1 – 42.73%] = 142.7W

△T (desired) = [65 – 27] = 38°C

△T (heat sink) = 142.7 x [0.22 + 0.1] = 45.7°C

△T (heat sink) 45.7°C > △T (desired) 38°C

Tc = 45.7 + 27 = 72.7°C

Tj = [249.2 x 0.1] + 72.7 = 97.6°C
 
ttystikk

ttystikk

Well-Known Member
nevergoodenuf said:
I just got some more info on the Citizen CLU550. This COB is looking better and better, every time I look at it. The only thing that suck is the voltage @ 104v. The HLG120 x2 puts it at 300 watts. I just ordered 8 HLG120H-C1050b. This will keep my max under 300 watts. Also am getting some precut TIM. I also have CDIWebs VP of Sales looking for more cooling options for 200 watts+ COBs.

EQUATIONS

Heat to Remove (W) = Input Power to COB (W) x [1 - Light Extraction Efficiency (%)]

Light Extraction Efficiency (%) = [0.0029 x Efficacy (lm/W)] + 0.0097

△T (desired) = Tc – Ta (desired case – ambient)

△T (heat sink) = Heat to Remove (W) x [Rth (heatsink) + Rth (TIM)]

Tc (actual case) = △T (heat sink) + Ta (ambient)

Tj (actual junction) = [Input Power to COB (W) x COB Rj-c] + Tc (actual case)


EXAMPLE ASSUMPTIONS

Citizen CLU550-3626C1-40AL7G4

Total Drive Current (into both channels) = 2400mA

Forward Voltage = 103.8V

Input Power to COB = 249.2W

lm/W = 144

Tj = 90°C

Rj-c = 0.1°C/W

Tc(max) = 105°C

Tj(max) = 140°C

MechaTronix CoolBay Tera-A

Rth = 0.22°C/W

Laird Technologies TPCM585-ZHA

Rth = 0.1°C/W

Tc (desired) = 65°C

Ta (ambient) = 27°C

EXAMPLE CALCULATION

Light Extraction Efficiency (%) = [0.0029 x 144] + 0.0097 = 42.73%

Heat to Remove (W) = 249.2 x [1 – 42.73%] = 142.7W

△T (desired) = [65 – 27] = 38°C

△T (heat sink) = 142.7 x [0.22 + 0.1] = 45.7°C

△T (heat sink) 45.7°C > △T (desired) 38°C

Tc = 45.7 + 27 = 72.7°C

Tj = [249.2 x 0.1] + 72.7 = 97.6°C
Click to expand...
THANK YOU! I got me some homework to do!
 
ttystikk

ttystikk

Well-Known Member
welight said:
Not sure if you guys are interested but we get custom COB's made for us, and we have a 275 watt Chip being made, so somewhere in between cxb3590 and 550watt Citi, small qty available beginning of Jan, 3500K, 110V, max 2.5amp. Datasheet will be up soon.


We can accept preorders for anyone who would like to trial this bad boy
http://www.cutter.com.au/proddetail.php?prod=cut2855
Cheers
Mark
Click to expand...
Wanna see an efficiency/current droop curve, please!
 
bassman999

bassman999

Well-Known Member
welight said:
Not sure if you guys are interested but we get custom COB's made for us, and we have a 275 watt Chip being made, so somewhere in between cxb3590 and 550watt Citi, small qty available beginning of Jan, 3500K, 110V, max 2.5amp. Datasheet will be up soon.


We can accept preorders for anyone who would like to trial this bad boy
http://www.cutter.com.au/proddetail.php?prod=cut2855
Cheers
Mark
Click to expand...
Is regular price going to be different that the pre-order price?
 
littlejacob

littlejacob

Well-Known Member
Bonjour
The more I think about it the more I am sure I am not going to buy a big cob...it is too hps like for me...!
Imo light spread is one of cobs best advantage and 55w is f.....g bright!
So I don't get the point to put a big light in the middle of the box with less efficiency and who will bleach my plants...!
Maybe for very big area without reflective wall it would be nice because this way you would need less cob but not for growbox with mylar on walls...!
Have a great day ★
 
nevergoodenuf

nevergoodenuf

Well-Known Member
I under stand what you are saying, but there are six or more companies to suit your need and others. I don't want just one point over a 4'x4', but I am looking something like 800 watts to 1280 watts,four lights, to cover a 5'x5' to a 6'x6'. I amloving the progress of my stadium light/with an agrotech hood. It's 500 watts covering a 3'x4' area. It still has a while until it's done, but even at the bottom it has nice nugs. The Sour D is almost 4'. I plan on running 2 chip 18" apart on this hood.




3 or 4 weeks to finish.
 
bassman999

bassman999

Well-Known Member
nevergoodenuf said:
I under stand what you are saying, but there are six or more companies to suit your need and others. I don't want just one point over a 4'x4', but I am looking something like 800 watts to 1280 watts,four lights, to cover a 5'x5' to a 6'x6'. I amloving the progress of my stadium light/with an agrotech hood. It's 500 watts covering a 3'x4' area. It still has a while until it's done, but even at the bottom it has nice nugs. The Sour D is almost 4'. I plan on running 2 chip 18" apart on this hood.




3 or 4 weeks to finish.
Click to expand...
Crazy cobs! Nice looking girls there
 
Hampsteri

Hampsteri

Well-Known Member
SupraSPL said:
Very interesting find. Here is what I have so far for CLU056-1825C1
Tj85C = TC60C.
Temp droop at TC60C = 6%
.044 V drop/ C
Nominal current is 2.25A and 51.95Vf @ Tj85C or 117W
the 3500K, typical lumens @ 2.25A Tj85C = 16791 lumens
That is 143.5lm/W at temperature, as GG mentioned.
If we assume an LER of 324 that is 44.3% efficient or 51.83 PAR W.
If cost is 40 euro or $45.5 USD, that is $0.88/PAR W

Cost matched comparison:
CXB3590 3500K CD @ 138W = 37.4% for $0.92/PAR W
Vero29 V2.0 3500K @ 79W = 40% for $0.90/PAR W

So this very large Citizen COB reinforces the theme, bigger is better. That said, for those who want more uniformity and willing to pay more/PAR W, the question would be how does the Citizen perform at lower dissipation W?
Click to expand...
So you used CLU056-1825C1-353M2G2 specs am i right? They are 37e per chip if you buy 5 or more and i have couple 52V 2.3A powersupplys lying around with no purpose.
 
bassman999

bassman999

Well-Known Member
Hampsteri said:
So you used CLU056-1825C1-353M2G2 specs am i right? They are 37e per chip if you buy 5 or more and i have couple 52V 2.3A powersupplys lying around with no purpose.
Click to expand...
They sell them pretty cheap.
I like trying the lesser known brands to find a hidden gem
What psu do you have, are they led drivers or a power supply?
 
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