New Citizen CLU058-1825 Lamp From Northern Grow Lights

guod

guod

Well-Known Member
PSUAGRO. said:
Not trying to be an asshole, but do we have any testing/confirmation on the #s other than Bobby's results.....I'm a little hesitant to believe.
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Malocan said:
robincnn did some pulse measurements at this site, if you didnt saw it allready
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BOBBY_G said:
Id be down with doing pulsed measurements if i could with any degree of accuracy. at high currents the numbers drop faster than i can observe them. trying to dial in an exact current and read a number in 1 sec just isnt possible.
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1 sek.....lol
real testng is 100 to 1000 times faster

"Brightness:
Brightness values are measured during
a current pulse of typically 10 ms, with a tolerance
of +/- 7%.

Forward Voltage:
The Forward voltage is measured
during a current pulse duration of typically 1 ms with
a tolerance of ± 0.05V

and here is one of the beast that can do this...
http://sine.ni.com/nips/cds/view/p/lang/en/nid/212038#

the why and whats...
pul.JPG
http://sine.ni.com/np/app/main/p/ap/mi/lang/en/pg/1/sn/n17:mi,n21:7037/fmid/8839/
 
BOBBY_G

BOBBY_G

Well-Known Member
2.0A data:

upload_2016-7-12_2-40-11.png

so less than 1%

im cool with that considering all cobs are tested under similar conditions and we are seeing @ 100W in the most recent chart with 1825 as a baseline:

3618 +3.2%
V29v7 -7.0%
3590 -12.8%
V29v6 -16.7%

considering the droop is less than 1% and all chips experience some droop were prob looking at a max of 0.5% difference in the absolute values of the chips which would not be a big difference

the entire point is moot unless youre installing this very same chip. even chips within a bin/lot can vary by *well over* 1% so take all data with a grain of salt
 
BOBBY_G

BOBBY_G

Well-Known Member
guod said:
1 sek.....lol
real testng is 100 to 1000 times faster

"Brightness:
Brightness values are measured during
a current pulse of typically 10 ms, with a tolerance
of +/- 7%.

Forward Voltage:
The Forward voltage is measured
during a current pulse duration of typically 1 ms with
a tolerance of ± 0.05V

and here is one of the beast that can do this...
http://sine.ni.com/nips/cds/view/p/lang/en/nid/212038#

the why and whats...
View attachment 3730304
http://sine.ni.com/np/app/main/p/ap/mi/lang/en/pg/1/sn/n17:mi,n21:7037/fmid/8839/
Click to expand...
nice. what a bargain

http://sine.ni.com/nips/cds/view/p/lang/en/nid/212038

we can get all theoretical but i think guod demonstrates that anybody on this board who thinks they are taking a real pulse measurement is prob. mistaken.

take my data or leave it, im just a guy measuring real light output with a real heatsink under reasonably controlled real conditions, at steady state, which is how we all operate our lights

you can take mfr data (which NEVER jives with other companies' data), and yes every chip has different thermal characteristics. efficiency aside at a given wattage, when buying cobs i personally dont care about mfr data, i care about what a cree @ 50W looks like vs a citi or vero at 50W on the exact same heat sink in the exact same environment. if a chip has poor thermal characteristics its gonna show itself

at the end of the day its electricity in and photons out... thats my biggest concern. not how well cree and citizen and bridgelux are each individually following a NIST protocol so as to make their data comparable to other mfrs.. pulse data by definition discounts most if not all of a chips thermal transfer properties, which is kind of a big deal for real world applications
 
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CobKits

CobKits

Well-Known Member
and if there was any stress on the holder which could cause the very understandable deformation leading to lack of surface contact... it could be alleviated with a simple drill bit relief to the holes. but based on what im seeing here im not going to do that.
 
rob333

rob333

Well-Known Member
CobKits said:
and if there was any stress on the holder which could cause the very understandable deformation leading to lack of surface contact... it could be alleviated with a simple drill bit relief to the holes. but based on what im seeing here im not going to do that.
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have found a ok brand of cobs http://docs-asia.electrocomponents.com/webdocs/13d9/0900766b813d9c05.pdf i no they are no cree or vero but i can pick them up for 9.85 for a pack of 8 and were i get them from they say there a little beter then the citizen
 
robincnn

robincnn

Well-Known Member
CobKits said:
i guess i dont get this " no heatsinks for 058" problem

@robincnn , here are the heatsinks you sent me today - with BJBs mounted with the screws you sent me

tight yes but fits fine and doesnt cause any undo stress or strain on the holder

View attachment 3761508
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my 120 and 140 mm heatsinks have 54mm holes pre drilled for bender writh holder.
BJB need 55mm. So it is 1mm off. If M3 is 3mm then the holder holes are 3.3mm so you have 0.3mm on each side or 0.6mm of room to play. Still off by 0.4mm 0.4mm is not much and holes in holder may be tweaked for a perfect fit.
I would install a CLU058 BJB holder on my 120/140 heatsinks. I do not mind losing a cob in a worst case scenario.
But when it comes to offering advise to others I have to go by the datasheet/drawing

upload_2016-8-20_10-16-0.png
 
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