Top bin COB comparison 2

welight

welight

Well-Known Member
JorgeGonzales said:
Isn't that a perfectly even fight, dollar for dollar? I think cutter sells 3070s for $28, and that's a great price.

I'd love to see that shootout.

Editing to add...I still wonder if the 3070 would have been a better choice for me at 35W.



Same, what about price? Those Nichias are dark horses in this race. 108B vs 1212, look out.
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J108 at 50 watts is less that 140LPW, Citi is closer to 153LPW
Cheers
Mark
 
JorgeGonzales

JorgeGonzales

Well-Known Member
welight said:
J108 at 50 watts is less that 140LPW, Citi is closer to 153LPW
Cheers
Mark
Click to expand...
Thanks Mark. I remember the spread being unusually large in the data sheet...here we go:

NFDLJ130B 3500K CRI 80 Ta=25C
6210 - 7610 lumens @1150ma 39.2 Vf 45.08W 138-169 LPW

They give a typical value of 6700 lumens at 45W so ~148lm/W, but the binning is 138-169.

Anyway, looks nice enough on paper.
 
BOBBY_G

BOBBY_G

Well-Known Member
id test any extra chips you guys have laying around and want to loan out. def hard to compare data from different mfrs and every product seems to scale differently with current (esp at low current, we see see a lot of deviations from mfr specs)
 
SaltyNuts

SaltyNuts

Well-Known Member
SaltyNuts said:
Man, this all jibes pretty good with my head, (I'm using stoner-speak, lol).... the efficiency graphs (thanks Bobby-G!) look like the 1212 is gonna be roughly 10% less efficient than a 3590 at about 35W... all very rough but that is close enough for me! $12.50? I'll take sixteen! Those $10 Mechatronic heatsinks too, yo, "cheap and cheerful" as the man JG says. I'm thinking that sixteen 1212's at 1050mA would be pretty effin' bright. 36W per foot! Looks like two HLG-320H-C1050A would do the trick to power all sixteen cobs? I'd mount the drivers remote and use the internal pots for the seasonal dimming if need be, should drop to 25W/per cob at that spread. Now I just need an extra $800 for the build... shit my life sucks... who else here has high monthly expenses and lives on beans and rice...
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after the driver overhead talk I am now thinking that the sixteen-cob (CLUO-48-1212) would be better with four HLG240H-C1400's. The 1212 can do 50W on that $10 Mechatronic heatsink, so why not, and then you still have 50W of overhead per driver
 
Airwalker16

Airwalker16

Well-Known Member
SaltyNuts said:
after the driver overhead talk I am now thinking that the sixteen-cob (CLUO-48-1212) would be better with four HLG240H-C1400's. The 1212 can do 50W on that $10 Mechatronic heatsink, so why not, and then you still have 50W of overhead per driver
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Where is this $10 mechatronix sink that's doing 100w passively?
 
SaltyNuts

SaltyNuts

Well-Known Member
Greengenes707

Greengenes707

Well-Known Member
SaltyNuts said:
does anyone here know how to interpret the thermal resistance claim on the heatsink spec sheet? Is higher number "better", or is it the other way around?

I noticed that the $35 110W Mechatronix heatsink has a thermal resistance of 0.46 °C/W, whereas the cheapo $10/50W unit is 1.02 °C/W.
https://led.cdiweb.com/ProductDetail/MODULEDGIGA152150BHBG-MechaTronix/574069/
https://led.cdiweb.com/ProductDetail/MODULEDXTRA9980B-MechaTronix/574061/
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Lower resistance the better it will perform.

It represents the temp rise per watt of heat.

EX
  1. 25w(50w@50%efficiency) on a .46ºC/w should give ∆Tc pretty close to 11.5ºC rise over ambient...25C(ambient)+11.5C= 36.5C
  2. 25w(50w@50%efficiency) on a 1.02ºC/w should give ∆Tc pretty close to 25.5ºC rise over ambient...25c(ambient)+25.5C= 50.5C


Just like with almost everything, nothing is exact in the real world. Outside conditions can affect the outcome. But is a great place to start.
 
SaltyNuts

SaltyNuts

Well-Known Member
I see, thank you Greengenes.

That explains a lot.

Greengenes707 said:
Lower resistance the better it will perform.

It represents the temp rise per watt of heat.

EX
  1. 25w(50w@50%efficiency) on a .46ºC/w should give ∆Tc pretty close to 11.5ºC rise over ambient...25C(ambient)+11.5C= 36.5C
  2. 25w(50w@50%efficiency) on a 1.02ºC/w should give ∆Tc pretty close to 25.5ºC rise over ambient...25c(ambient)+25.5C= 50.5C


Just like with almost everything, nothing is exact in the real world. Outside conditions can affect the outcome. But is a great place to start.
Click to expand...
 
pop22

pop22

Well-Known Member
so why is the 1812 skipped over in this thread? Seems like a better bang for your buck than a CXA 3070 and pretty close to a CXB 3590?

I've got 5 coming to test.
 
P

PurpleBuz

Well-Known Member
pop22 said:
so why is the 1812 skipped over in this thread? Seems like a better bang for your buck than a CXA 3070 and pretty close to a CXB 3590?

I've got 5 coming to test.
Click to expand...
well the 1212 is more efficient and the 1818 is probably closer to a cxb3070.
 
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