New CREE COB finally launched

PilouPilou

PilouPilou

Well-Known Member
New Cree XLamp High Current LEDs Expand Industry’s Broadest Chip-on-Board LED Portfolio
OCTOBER 4, 2017
CMA LED Arrays Deliver Best-in-Class Lumen Output, Efficacy and Reliability

DURHAM, N.C. -- Cree, Inc. (Nasdaq: CREE) announces a new family of XLamp® CMA High Current LED Arrays that provide the industry’s best lumen density and efficacy for metal-based chip-on-board (COB) LEDs. Optimized for operation at high drive currents, the CMA LEDs deliver up to 2 ½ times the lumen density of Cree’s Standard Density CXA2 LEDs. The new CMA LEDs are compatible with the existing ecosystem of holders and optics for the CXA2 LED family, enabling lighting manufacturers to boost the lumen output of their products with minimal redesign.

“Cree is an outstanding partner for LED lighting because of their customer-focused innovation,” said Andrea Gallucci, head of optics & electronics at Artemide. “Since the new High Current CMA LED Arrays are compatible with the Standard Density CXA2 LED family, we can easily deliver more visual impact while maintaining the same optics options and color quality choices that our customers are looking for. These new CMA LEDs will speed up the pace of performance enhancements within both our iconic and innovative luminaire designs.”

The CMA LED Arrays feature a new innovative metal COB technology that delivers higher reliability than competing metal COBs. In addition, the CMA LEDs can be mounted directly to the heat sink, which eliminates the need for holders, simplifies the luminaire manufacturing process and reduces system cost.

“Through relentless innovation, our scientists achieved fundamental technology breakthroughs that significantly improve both the light output and the lumen maintenance of our new CMA LEDs over currently available metal-based COB LEDs,” said Dave Emerson, Cree LEDs executive vice president and general manager. “Only Cree delivers excellent lumen density and reliability that customers demand through both ceramic and metal COB technologies.”

The CMA LED family includes five LEDs with light emitting surface (LES) sizes ranging from nine to 23 mm to address a wide variety of applications. Featuring Cree’s EasyWhite® bins, the XLamp CMA LED arrays are available in 2700K-6500K CCTs with standard color options of 70, 80 and 90 CRI and premium color options that include high fidelity (98 CRI) and specialty color points. Product samples are available now, and production quantities are available with standard lead times. Please visit www.cree.com/cma to learn more.

http://www.cree.com/led-components/landing-pages/cma

Your opinion guys is welcome, especially the pros!
 
CobKits

CobKits

Well-Known Member
well looking at the largest chip they are basically a CXB3070 with holes - chips are 27.35mm and so they will use the CXB3070 holders which are available in both ideal and BJB. thats good as the 3070 holders are all 35mm screw spacing like the clu048 holders so good heatsink compatibility there

lets look at performance per datasheet
4000k 80 cri:
Tj=85C
current= 1800 mA
voltage= 45.3 V
watts = 81.54
typ lumens=12372
lumens/W = 151.72

citi 1818 @ 81.5W, 85C:

upload_2017-10-9_23-54-50.png

seems like its right in that same range. i imagine at the currents we use these wont be much different than CXB3590 which has a larger LES and larger footprint to heatsink, performance seems similar- cree PCT puts out just over 150 lm/W with CXB3590@ 81W/85C Tj (with DD bin that 4000k 80cri should be into soon if not already.)

looking at 72V just for fun:
4000k 80 cri:
Tj=85C
current= 1200 mA
voltage= 67.8 V
watts = 81.4
typ lumens=12372
lumens/W = 151.99 (same as above- rounding error due to guessing at voltage)
so unlike Veros, Cree appears continues the tradition of the same number of dies per chip in their voltage variants, just wired differently so no performance advantage to running either voltage

of course datasheets are just datasheets, proof is in the pudding so we'll have to test it, but it seems to be in the same range as citi1818/veroB/luminus in the 80W range

but Cree is known for its great dies so who knows with the metal substrate it may be a dark horse and punch above its weight at low currents like the Luminus do...

price will be a factor considering the handful of comparable chips in the $17-$23 range

where the chip really stands out to me is its uber low voltage for a 50V chip. either they have some bomb-ass new low voltage dies or they are running 17 dies in series instead of 18. in any case it opens up some options for drivers in some cases
 
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CobKits

CobKits

Well-Known Member
possibly. but other mfrs are also halfway to their next gens by now as well. more importantly they are getting cxb3590 performance out of a cxb3070 package so maybe we will see something in the 3590 size that hangs with vero C/citi 1825/luminus cxm32

so apart from the substrate change, with the voltage bump from 36 to "50V" it just appears they are cramming more dies on the chip (3590s have 144 dies in 12x12 just like citi 1212)- this is prob an 18x12 or 18x18 die layout

they say samples are available so lets get ahold of one!
 
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vilify

vilify

Well-Known Member
I'm no expert but have looked into building my own LED's for a while now. Are you referencing 80 CRI because its more standard?

I never even considered lower CRI as an option for my potential builds.
 
CobKits

CobKits

Well-Known Member
vilify said:
Are you referencing 80 CRI because its more standard?
Click to expand...
its completely arbitrary. i usually test 4000k 80 because they are super common, one of the first colors available, and also the spectrum is usually almost identical from mfr to mfr and also falls almost completely within my 400-700 PAR meter response.

but in this case i picked it out of habit. results should be similar if you picked any other color
 
pirg420

pirg420

Well-Known Member
Theres no mention of bins in these datasheets. Usually when cree produces a new chip its atleast as efficient as the old one, plus 8-10%. (just like a bin jump)

Id expect them to add some binning info in the coming weeks to the datasheet? Because right now the Lumen/watt seems to be less than the DB which is odd.

thoughts?
 
vilify

vilify

Well-Known Member
Can't seem to find where I read it but I believe they mentioned 20% gains in efficiency over CXA2. Doubt they are actually quite that high but time will tell.
 
CobKits

CobKits

Well-Known Member
pirg420 said:
Id expect them to add some binning info in the coming weeks to the datasheet? Because right now the Lumen/watt seems to be less than the DB which is odd.
Click to expand...
the chip is a lot smaller than the DB and DD bin 3590. 3070 isnt into DB bin i dont think
 
REALSTYLES

REALSTYLES

Well-Known Member
CXB3590 for the win and DB bin will be available once they get the formula right, that why they are not available yet because Cree hasn't been able to get it consistent yet. I still know why everyone is buying the other cobs. It's price that's making your decisions and Cree is making a big mistake with those chips because you guys are cheap lol. Now the DB CXB3590's are worth more when you can get them lol. Just look at my plants lol I think when I show the results I get will change a lot of you guys mind lol

SAM_2106.JPG SAM_2103.JPG SAM_2104.JPG SAM_2107.JPG

Day 1 of week 4 flower all organic no AC. I don't want to post my PPFD it will start fights lol I have meters just look at my old post lol
 
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