C.O.B.S.S.L. News and Articles

stardustsailor

stardustsailor

Well-Known Member
FranJan said:
COB NEWS + INFO


Zhaga Consortium Starts Working on New COB LED Array Specification
http://www.lightimes.com/documents/view/sectornews.php?id=124596&sector=ledmod#top

(*Basically they are going to standardize COB design and hopefully that means holders and reflectors will be cheaper and easier to find. Good news for the COBsters.)
​
December 11, 2014...The Zhaga Consortium, which develops specifications for interchangeable LED light sources, is now working on a new Book that will include Chip-on-Board (COB) LED arrays. COB arrays are in widespread use, but different manufacturers offer a wide range of alternative sizes. The consortium notes that this creates problems for luminaire makers and other stakeholders such as COB holder suppliers and limits their options of using alternative products from different suppliers.

“We consulted many luminaire makers, and received broad support for our plans to standardize this type of LED light source,” said Musa Unmehopa, secretary general of the Zhaga Consortium. “These companies asked us to standardize properties such as the mechanical dimensions of the module, the position of electrodes, and the diameter of the light-emitting surface.”

Zhaga says its standardization removes arbitrary variations in a small number of parameters, to allow interchangeability of LED light sources. The consortium contends that for customers, standardization simplifies the comparison and selection of products. The consortium says that it allows COB-array makers to focus on offering value-added differentiation to customers, such as luminous efficacy, quality of light, or thermal properties.

“For Zhaga Books to be successful, they need to reflect the wishes of the market,” said Unmehopa. “We welcome any input from COB makers or other companies, who are invited to join Zhaga and contribute to the ongoing discussions.”

The new Zhaga Book will define rectangular and square LED modules with a circular light-emitting surface (LES) and a separate LED driver. The Book will define a family of modules with different dimensions. In the majority of cases, modules that are compliant with the new Book will employ COB technology* for the light-emitting section. However, the Zhaga specification will not prevent the use of alternative technology approaches.

After extensive discussion the consortium decided to specify a family of six rectangular or square modules, with the following PCB dimensions: 12 x 15 mm, 16 x 19 mm, 19 x 19 mm, 20 x 24 mm, 24 x 24 mm, and 28 x 28 mm.

The circular LES sizes defined in the new Book will correspond to the LES categories specified in several current Zhaga Books that cover spotlight modules (Books 3, 5, 10 and 11). COB LED arrays are used both with and without holders, depending on the luminaire type and application. The consortium expects that the new Zhaga Book will also include specifications for these holders.

In common with other Zhaga specifications, the new Book will only restrict the parameters necessary to enable interchangeability. In addition to PCB dimensions and thickness, such parameters are likely to include the location of the LES centre point; the position and size of the electrode positions; and the location of the thermal measurement point.

Screw holes will be optional, since many COB arrays are mounted directly using a thermal interface material. However, if screw holes are used, then their position and size should conform to the Zhaga specification.

Zhaga plans to discuss whether other features should be part of the specification such as a current-setting resistor to the board, for example, or the adding a temperature sensor to prevent over-temperature operation.
Click to expand...
You know what that probably means ,eh ?
Might be that something new is about to hit the market soon ...

Cheers.
:peace:
 
stardustsailor

stardustsailor

Well-Known Member
zangtumtum said:
I simply wanted to report if it was not already been published, Bridgelux patent:

- Patent No.: US 8,541,802 B2
- Date of Patent: Sep.24,2013
- Assignee: Bridgelux, Inc., Livermore, CA (US)

US-8541802-Phosphor-Placement-In-White-Light-Emitting-Diode-Assemblies
Click to expand...

How come this slept away from my sight ?

Hmmm ...
Maybe it's about time to test a DECOR series 3000K Vero ...
My hard guess is trhat they are gonna rock the plants ,from mid flowering to harvest time ...
Not sooner than mid-flowering ....Too much dreds+ FR on them ...

And by this patent it becomes obvious that the high CRI "DECOR " series from Bridgelux ,
is probably very different ,efficiency -wise, from the High -CRI COB arrays of other brands ...

They placed the red phoshor ,in contact with the substrate ...
Very clever ...
cont.JPG



It has been proved ,that layered different phosphor blends ,
are much more efficient in light emission than
randomly mixed phosphor blends ...
A series of complex phenomena ,with particle size and re-absorption /
re-excitation being most crucial factors ,is the reason for the above fact .

So layered red phosphor low ,in contact with the substrate so to be cooled better ,
thus incresingthe deep red phosphor emission efficiency.

It uses the blue ,internally scattered light or is it a volume emitter ?
Red photons are more directive than the rest of visible light photons ,with the blue ones scattering very quick/easily ..
So ,no matter that red phosphor is 'deep within' the package ,still it has the ability to exit the encapsulant ...
It does not scatter easy ..
Clever ..

No red phosphor on top of blue excitation die ...
Clever ...

Hmm ..And the possible phosphors ,of the Decor High -CRI series ...

pat mix .JPG


Green Aluminate 545 nm ... ...Hmm ..

One of these types (not necessarily the brand ) might be the case ?
- http://www.intematix.com/uploads/phosphor-datasheets/GAL545-L.pdf
- http://www.intematix.com/uploads/phosphor-datasheets/GAL545-L.pdf
- http://www.intematix.com/uploads/phosphor-datasheets/GAL545-S.pdf

All of them : " Intematix aluminates enable 90+CRI in blends with their red nitrides. "

Yellow Silicate 574 nm :
- http://www.intematix.com/uploads/phosphor-datasheets/Silicate/EY4750.pdf

DATASHEET
Product Description and Application:
•
EY4750 silicate phosphor is designed for low to mid-power
white illumination.
•
It can be used in combination with other EY series products for color tuning and to achieve a
broader emission spectrum. EY4750 can be excited by a wide range of wavelengths from blue to
near UV. The deep yellow color allows access to warmer white using a single phosphor.
•
EY4750 can be used for high brightness white LEDs in mobile display backlighting, general and
task lighting, camera flash, signage, decoration :P....., and automotive applications
Click to expand...
Red Nitride 650 nm :

http://www.intematix.com/uploads/phosphor-datasheets/nitrides/RR6634-03-15.pdf


Product Description and Application:
•
Ruby Red Nitride RR6634-03 phosphor is designed for high power LEDs with high junction
temperatures and high luminous flux, such as 1-10W packages or high power arrays.
•
Ruby Red Nitride can withstand high power conditions while maintaining the consistent
brightness and color required for products with long lifetimes such as lighting or large area displays.
•
RR6634-03 phosphor can be used to achieve high gamut backlights for TVs and Monitors and
90+ CRI, high R9 white light for high color rendering illumination.

I wonder ..
By which method of the 5 ( latin : V ) they went finally ,to make the Decor Series ?
which.JPG


Cheers
:bigjoint:
 
Mechmike

Mechmike

Well-Known Member
stardustsailor said:
Next thing to come ?
I hope is the much awaited ( at least by me ) COB .....
UV diodes (high energy photons ) ...Blue+green+red phosphor mix ..
I'm expecting efficiencies close to 60-65 % @350 mA ..
Or is it that my dreams just rock my mind ?
phANtASy over LOGIC ...
;-)

Cheers.
:peace:
Click to expand...
Dreaming is the most important thing... Al Einstein said "Imagination is more important than knowledge".
 
stardustsailor

stardustsailor

Well-Known Member
Secret Revealed For 2015
New Vero29 series will hit the market .
The current one ( Vero 1.2 series ) has a typical performance of 124 lm/W
(BXRC-30E 10K0-L-xx, @ 2100 mA ,Tc=25°C,Rad eff.= 38.6% )

The new 2015 Vero29 series ( Vero 2.0 ) will be somewhere between 135-140 lm/W .
A new rad .eff of 42 - 43.6 % ,at 2100 mA ,Tc=25 C ....

....:P...
tse.JPG




Cheers.
:peace:
 
stardustsailor

stardustsailor

Well-Known Member
FranJan said:
I wonder what the boost in L/w will be for the Vero 18 assuming it's getting an upgrade too? Any idea when this upgraded Vero 29 is hiiting the shelves?
Click to expand...
Nope ...
:sad:
Not any idea about when they 're going to hit the shelves ..
2015 is the International year of the light .
http://www.light2015.org/Home.html

Should we hold big or small shopping bag this year ,I wonder myself ...
;-)

Cheers.
:peace:
 
Mechmike

Mechmike

Well-Known Member
The new Vero is good news. Now that I've nearly got my light perfected, snicker snicker... Something promising for the new year. I'll bite big on a major efficiency upgrade. Now I'll have to decide what to do with the 'old' emitters. Maybe retrofit the entire house, garage and outdoor lights?
 
FranJan

FranJan

Well-Known Member
LOL "International Year of Light" :roll:. Every year is the International Year of Light. That's why they call them light years ;). When's it gonna be my International Year :cool: !???? Or yours SDS??? LOL:p

Anyway I'm pretty excited for the year 2015 in light because LightFair International is a comin' to my shit-hole town in May and Leducation 9 before that in March to get me all primed for LFI. So it looks like I'll have to put my lone suit and tie on and see how many freebies/samples, (Vero 2.0s maybe :)), I can get. Sadly Illumitex won't be there:o and now I know they are just dodging me :-P.

http://www.lightfair.com/lightfair/V40/index.cvn?id=10268
http://www.leducation.org/
 
stardustsailor

stardustsailor

Well-Known Member
FranJan said:
LOL "International Year of Light" :roll:. Every year is the International Year of Light. That's why they call them light years ;). When's it gonna be my International Year :cool: !???? Or yours SDS??? LOL:p

Anyway I'm pretty excited for the year 2015 in light because LightFair International is a comin' to my shit-hole town in May and Leducation 9 before that in March to get me all primed for LFI. So it looks like I'll have to put my lone suit and tie on and see how many freebies/samples, (Vero 2.0s maybe :)), I can get. Sadly Illumitex won't be there:o and now I know they are just dodging me :-P.

http://www.lightfair.com/lightfair/V40/index.cvn?id=10268
http://www.leducation.org/
Click to expand...
LOL!
Seriously ,now ..
Lucky you !

Cheers.
:peace:
 
SupraSPL

SupraSPL

Well-Known Member
Gotcha, so one the current batch runs out maybe? As of now, Digikey has 927 3000K Vero 29s in stock. I suppose for all we know we could still be getting version 1.0s?
 
alesh

alesh

Well-Known Member
FranJan said:


Philips Luxeon COBs
http://www.philipslumileds.com/



LUXEON COB Application Brief:
http://www.philipslumileds.com/uploads/426/AB115-pdf
LUXEON COB Product Datasheet:
http://www.philipslumileds.com/uploads/419/DS115-pdf

Luxeon with Crisp White
LUXEON CoB with CrispWhite Technology Product Brief:
http://www.philipslumileds.com/uploads/483/PB138-pdf
LUXEON CoB with CrispWhite Technology Datasheet:
http://www.philipslumileds.com/uploads/482/DS138-pdf
Features & Benefits​
  • 90CRI with CrispWhite enhancement for perfect combination of warm colors and white that stands out!
  • Hot targeted within a 3-Step MacAdam Ellipse below the BBL that is ideal for CDM-CMH replacement
  • Creating a second blue peak (~410-415nm) in the spectrum that activates fluorescent whitening agents paints/fabrics
  • Lumen packages from 1,000 to >5,000 lumens and efficacies of >90 lm/W
  • Real world application testing conditions at Tj=85°C
  • Robust MCPCB solution - easy to handle in manufacturing and operations
  • Mousebites for M2/M3 easy to screw down arrays
Click to expand...
I ran some numbers on CrispWhite COBs and the results:
LER 272lm/W. Digitized data in the attached txt.
Typical efficiency@test current@85 degree Celsius: 33%
Efficiency can go way up if run soft and cool.

Not that amazing numbers in comparison with CXA3070/Vero but the violet peak and quite a lot of (deep) red could be interesting. Perhaps in the last stage of flowering?
 

Attachments

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PurpleBuz

Well-Known Member
alesh said:
I ran some numbers on CrispWhite COBs and the results:
LER 272lm/W. Digitized data in the attached txt.
Typical efficiency@test current@85 degree Celsius: 33%
Efficiency can go way up if run soft and cool.

Not that amazing numbers in comparison with CXA3070/Vero but the violet peak and quite a lot of (deep) red could be interesting. Perhaps in the last stage of flowering?
Click to expand...
I needed a picture ...
imo this would be great to flower under after intial stretch is done. I'm wondering though if it would be signifcantly more efficient to use a separate string for the extra violet, deep reds and far reds ?

phillipsspd.jpg
 
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