Top bin COB comparison 2

welight · Jul 15, 2016

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.

J108 at 50 watts is less that 140LPW, Citi is closer to 153LPW
Cheers
Mark

PurpleBuz · Jul 15, 2016

JorgeGonzales said:
Same, what about price? Those Nichias are dark horses in this race. 108B vs 1212, look out.

that confuses me,
1212 has a 22mm les why compare to a 14.6 mm les ?

JorgeGonzales · Jul 15, 2016

welight said:
J108 at 50 watts is less that 140LPW, Citi is closer to 153LPW
Cheers
Mark

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.

JorgeGonzales · Jul 15, 2016

PurpleBuz said:
that confuses me,
1212 has a 22mm les why compare to a 14.6 mm les ?

$10 and $12, close specs. I'd like to see them in the mix is all, they look nice. Did you build with the 108?

PurpleBuz · Jul 15, 2016

JorgeGonzales said:
$10 and $12, close specs. I'd like to see them in the mix is all, they look nice. Did you build with the 108?

I have the 130B, ran some heatsink tests, haven't assembled yet. been too busy trimming

BOBBY_G · Jul 15, 2016

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 · Jul 17, 2016

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...

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 · Jul 17, 2016

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

Where is this $10 mechatronix sink that's doing 100w passively?

Malocan · Jul 17, 2016

Airwalker16 said:
Where is this $10 mechatronix sink that's doing 100w passively?

he doenst say something about 100w passive heatsink for 10dollar. he wrote something about a 50w heatsink for 10 dollar

Airwalker16 · Jul 17, 2016

Malocan said:
he doenst say something about 100w passive heatsink for 10dollar. he wrote something about a 50w heatsink for 10 dollar

He said 50 & then another 50w of overhead.

PurpleBuz · Jul 17, 2016

Airwalker16 said:
He said 50 & then another 50w of overhead.

50 w of overhead for the driver, not the heat sink. Sounds like remedial reading comprehension is in order

SaltyNuts · Jul 17, 2016

Airwalker16 said:
Where is this $10 mechatronix sink that's doing 100w passively?

I was talking about this one that does 50W passively
https://led.cdiweb.com/ProductDetail/MODULEDXTRA9980B-MechaTronix/574061/

but this one does 75W
https://www.cdiweb.com/ProductDetail/MODULEDMEGA134100BHBG-mechatronix/574067/

and 110W
https://led.cdiweb.com/ProductDetail/MODULEDGIGA152150BHBG-MechaTronix/574069/

SaltyNuts · Jul 17, 2016

Airwalker16 said:
He said 50 & then another 50w of overhead.

Talking about four cobs at 50W on an HLG-240, that leaves 50W available overhead from the driver, so running at about 80% of driver capacity

SaltyNuts · Jul 17, 2016

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/

Greengenes707 · Jul 17, 2016

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/

Lower resistance the better it will perform.

It represents the temp rise per watt of heat.

EX

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
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 · Jul 17, 2016

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

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

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.

pop22 · Aug 3, 2016

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.

PurpleBuz · Aug 3, 2016

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.

well the 1212 is more efficient and the 1818 is probably closer to a cxb3070.

pop22 · Aug 3, 2016

From looking at the charts on here, I'd say the 1812 is better than a 3070 and not far from a cxb 3590

PurpleBuz said:
well the 1212 is more efficient and the 1818 is probably closer to a cxb3070.

pop22 · Aug 3, 2016

And I'll take slightly less efficiency for more photons!

Top bin COB comparison 2

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