qwerkus
Well-Known Member
Check the docu. Max power for the citizen cob is 365w!
COB Manufacturers other than CREE or BRIDGELUX
- Thread starter qwerkus
- Start date
guod
Well-Known Member
alesh
Well-Known Member
Yeah because he explicitly said he was going to run them at 365W...I'm pretty sure he can read too.
qwerkus
Well-Known Member
Thank you for worrying about my alphabetisation level 
Actually, my plan would be to feed those COB some 50-60W max, and see if I can break the cree cxb efficiency chart... I have no Idea how I would cool 365W in my kitchen.
EDIT: http://www.zalman.com/global/product/Product_Read.php?Idx=416
Rated for 300W. I once had one, and this cooler just rocks. You can get one for 20€ en ebay. Perhaps I will test the derating curve after all...
Actually, my plan would be to feed those COB some 50-60W max, and see if I can break the cree cxb efficiency chart... I have no Idea how I would cool 365W in my kitchen.EDIT: http://www.zalman.com/global/product/Product_Read.php?Idx=416
Rated for 300W. I once had one, and this cooler just rocks. You can get one for 20€ en ebay. Perhaps I will test the derating curve after all...
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qwerkus
Well-Known Member
Those seem to be 100W heatsinks. Way overpriced if you ask me. Intel core2 stock cooler are much better, and you can get them for next to nothing. (http://www.frostytech.com/articleview.cfm?articleID=2132)
littlejacob
Well-Known Member
Oupssss
Sorry...I missed this on data sheet
365w @?...how many amps?
Is it twice the size of a 3590?
have a great day ★
guod
Well-Known Member
"The stock Intel Core 2 Duo heatsink is composed of two sections - the first an outer ring of extruded aluminum with 24mm long curved cooling fins, the second an internal 32mm diameter cylindrical copper Heat spreader"
size of the CLU056-1825C1
Mechanical Dimensions : 38.0×38.0×1.4 (mm)
perfect match... happy mounting
SupraSPL
Well-Known Member
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?
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?
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SupraSPL
Well-Known Member
Citizen CLU056-1825C1 @ 1.4A (70W)
Tj75C = TC50C
Temp droop @ TC50C = 4.1%
1.4A * 50.46Vf @ TC50C = 70.66W
the 3500K, typical lumens @ 1.4A TC25C = 17898
current droop factor at 1.4A = 64% so 11455 lumens
temp droop at TC50C = 4.1% so 10985 lumens
10985/70.66W = 155.5 lumens/W
155.5/324 = 48% efficient or 33.9 PAR W
$45.5/33.9 = $1.34/PAR W
Cost matched comparison:
CXB3590 3500K CD @ 75.5W = 49.7% for $1.26/PAR W
Vero 29 V2.0 3500K @ 51W = 43% for $1.29/PAR W
So the Citizen behaves a lot like the Vero series, resistant to current droop and excels at running hard while the CXB3590 still the best option for high or very high efficiency. Another way to look at it, if you are going to run at 75W/COB or lower, the CXB3590 is cheaper and better. If you are going to run harder than that, the Citizen would threaten the Vero29 (assuming it is available and actually cost $45.50 or less).
Tj75C = TC50C
Temp droop @ TC50C = 4.1%
1.4A * 50.46Vf @ TC50C = 70.66W
the 3500K, typical lumens @ 1.4A TC25C = 17898
current droop factor at 1.4A = 64% so 11455 lumens
temp droop at TC50C = 4.1% so 10985 lumens
10985/70.66W = 155.5 lumens/W
155.5/324 = 48% efficient or 33.9 PAR W
$45.5/33.9 = $1.34/PAR W
Cost matched comparison:
CXB3590 3500K CD @ 75.5W = 49.7% for $1.26/PAR W
Vero 29 V2.0 3500K @ 51W = 43% for $1.29/PAR W
So the Citizen behaves a lot like the Vero series, resistant to current droop and excels at running hard while the CXB3590 still the best option for high or very high efficiency. Another way to look at it, if you are going to run at 75W/COB or lower, the CXB3590 is cheaper and better. If you are going to run harder than that, the Citizen would threaten the Vero29 (assuming it is available and actually cost $45.50 or less).
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qwerkus
Well-Known Member
Very interesting input - thank you Supra. In Europe, I did not find any retailer for cxb3590 high bin under 60€/piece. KB on Ali asks for $50+shipment, which mean Citizen is actually cheaper for me. Yet your low power efficiency results let me wonder if Citizen CLU046 would not be the ultimate catch at the moment: http://ce.citizen.co.jp/lighting_led/dl_data/datasheet/en/COB_4/CLU046-1818C1_P3085_0415.pdf
11600 Lumen @ 84.24W - only 24€/pc (if you take 5)
http://www.tme.eu/en/details/clu046-1818c1503m2/white-power-leds-cob/citizen/clu046-1818c1-503m2g2/
Looks good for my 50W project.
11600 Lumen @ 84.24W - only 24€/pc (if you take 5)
http://www.tme.eu/en/details/clu046-1818c1503m2/white-power-leds-cob/citizen/clu046-1818c1-503m2g2/
Looks good for my 50W project.
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alesh
Well-Known Member
littlejacob
Well-Known Member
Bonjour
Remember that on tme you have to add 20% vat on every price if you live like me in EU! + 7, 50 € for shipping
I get my 4 cxb 3590 cd from kb for 205 € +.holders (10 $ shipping included) .
4 V29 in kb should cost 110 €...
Have a great day ★
Remember that on tme you have to add 20% vat on every price if you live like me in EU! + 7, 50 € for shipping
I get my 4 cxb 3590 cd from kb for 205 € +.holders (10 $ shipping included) .
4 V29 in kb should cost 110 €...
Have a great day ★
qwerkus
Well-Known Member
Thank you for the numbers. How would the citizen CLU046 perform against cree cbx 3070 ?
alesh
Well-Known Member
You have to pay VAT too when ordering from Kingbrite. Otherwise you're breaking the law.
littlejacob
Well-Known Member
Of course..........
I will call french custom tomorrow to tell them that I stole money from them and I am sorry that I done this to my poor country and that it was the first time I broke the law....wait I grow hemp in France...F..k it is too late for me I am an outlaw...I am not going to change now!!! F..k vat
Have a great day ★
I will call french custom tomorrow to tell them that I stole money from them and I am sorry that I done this to my poor country and that it was the first time I broke the law....wait I grow hemp in France...F..k it is too late for me I am an outlaw...I am not going to change now!!! F..k vat
Have a great day ★
qwerkus
Well-Known Member
I happen to know a bit about customs in Western Europe. Up to 150€, they usually don t ask for VAT in France, although theoretically VAT is owed for any sum. Since most Chinese retailers undervalue their goods during shipment, small internet shipments are rarely controlled. In Germany there is a franchise of 23€, which is much better enforced - they open your package. But even there, if total sum of tax money owed is under 5€, you won't pay anything because it wouldn't cover administrative costs. In Switzerland, there is a not-so-well-known free trade agreement with china and only 8% vat, making things very sweet for ali shoppers. In all cases, usually CE certification for electronic devices is what matters most when buying LEDs; I've seen it more than once that your package gets shipped back because of that, and taxes/vat where not even mentioned!
Overall, it helps to inform yourself before buying anything abroad. Just write them an email. Customs are usually very friendly before, and not-so-friendly afterwards....
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