...All Things Vero...

Would you consider buying a VERO after reading through some of the posts?

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Greengenes707

Greengenes707

Well-Known Member
alesh said:
Ahh that's tricky. I know of no way of doing it without SPD charts for given CCT/CRI version. You can calculate xy chromaticity coordinates from SPD, you can calculate CCT and also CRI. But this is one-way only calculation.

From what is known about LEDs we can assume:
2700K has the same SPD as 3000K with smaller blue peak.
3500K has the same SPD as 4000K with smaller blue peak.
Check out this data sheet from Samsung. I believe that the SPD's could be very similar for Veros.
Click to expand...
Damn. They give the coordinates in the data sheets, and I can plot them, but I want a spd curve. The samsung is nice to see what some could be like. I'm actually curious about cree specifically, but saw some spd work by some others a few pages back in here.
Thanks
 
DonPetro

DonPetro

Well-Known Member
Hey guys...looking to power a Vero29 @ 100w on an Aa11. What driver would be recommended? Having a hard time finding one over 85% efficiency. Dimmable would be nice.
 
JavaCo

JavaCo

Well-Known Member
DonPetro said:
Hey guys...looking to power a Vero29 @ 100w on an Aa11. What driver would be recommended? Having a hard time finding one over 85% efficiency. Dimmable would be nice.
Click to expand...
This should run a vero 29 close to a 100 watts. 95 to a 100 watts depending on the Vf of the COB. http://www.jameco.com/1/1/58857-pwm-120-48-120w-2-5a-48v-pwm-output-led-power-supply-ac-dc-switching.html

Edit actually this one would be better. Would have to dim it a bit for a 100 watts http://www.jameco.com/1/1/58833-npf-120d-42-121-8w-2-9a-42v-single-output-ac-dc-switching-power-supply-led.html
 
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V

voon

Well-Known Member
Mechmike said:
The internal dimmer on the A version is limited to dimming to about 50%. The pot is accessed through a hole in the top of the driver with a tiny screwdriver. The B version is dimmable for nearly the entire range depending on the potentiometer selected. To dim one driver you'll need a 100k linear taper potentiometer. To dim 2 drivers with one potentiometer you can use a 50k pot and wire both driver dimming circuits to that pot. Then Meanwell data sheet explains the dimming function pretty well.
Click to expand...
I think that here described control version A is not correct. If I was wrong, so correct me. I did not have the opportunity to examine it physically, but I understood the after reading datasheets, so that version and is able to operate at 50% control of the output current mA, but also to 0-100% of the output voltage V, as well as version B in which it is necessary to use an external dimmer. Thus, the advantages and the integrated control via integrated potentiometer and finer control, can be used to regulate the voltage and current simultaneously, and that brings us to regulate the 0, xx%
 
V

voon

Well-Known Member
Greengenes707 said:
@voon @guod @alesh and anyone else who might know how or be able to help me...
Can someone show me how to enter new whites into the color calculator program? Like based off chromatic coordinates or something from the data sheet. I'm trying to see if I can see the spectrum of the different CRI's in each kelvin that aren't on the data sheet spd.
It would be much appreciated if someone has the time. Thanks.
Click to expand...
I do not know if I understood your question correctly.
I would advise to help, but I'm not also in this area a few knowledgeable and is a problem for me to create my own SPD from plots listed in datasheets. I used the SPD from members alesh SDS in this thread, thank you. If your question was directed to enter data into the program color calculator and Use the function, direct spectrum input ,, and enter into individual levels nm data from the SPD, before you have to program set in the,, Data-> spectrum from 360-830 1nm after entering Calculate make a tab, user spectra,, save as your spectrum. You can also enter SPD carried out directly on the tab,, user spectra-> import * .txt suite spectra data file,,
 
alesh

alesh

Well-Known Member
voon said:
I think that here described control version A is not correct. If I was wrong, so correct me. I did not have the opportunity to examine it physically, but I understood the after reading datasheets, so that version and is able to operate at 50% control of the output current mA, but also to 0-100% of the output voltage V, as well as version B in which it is necessary to use an external dimmer. Thus, the advantages and the integrated control via integrated potentiometer and finer control, can be used to regulate the voltage and current simultaneously, and that brings us to regulate the 0, xx%
Click to expand...
You probably misunderstood the data sheet. You can only control current by that pot, voltage is adjusted automatically to provide selected current - that's why they're constant current drivers. You cannot control voltage directly. Version A can be dimmed to 50% no less.
 
alesh

alesh

Well-Known Member
voon said:
I do not know if I understood your question correctly.
I would advise to help, but I'm not also in this area a few knowledgeable and is a problem for me to create my own SPD from plots listed in datasheets. I used the SPD from members alesh SDS in this thread, thank you. If your question was directed to enter data into the program color calculator and Use the function, direct spectrum input ,, and enter into individual levels nm data from the SPD, before you have to program set in the,, Data-> spectrum from 360-830 1nm after entering Calculate make a tab, user spectra,, save as your spectrum. You can also enter SPD carried out directly on the tab,, user spectra-> import * .txt suite spectra data file,,
Click to expand...
GG wants to create SPD charts that are not listed in the data sheet.
 
AquariusPanta

AquariusPanta

Well-Known Member
bicit said:
Alright so I just got off the phone with bridgelux. The new 130lm/w series (their term not mine) with be on digikey within 4 weeks. Additionally they are going to be the same price as the older 120lm/w series. So no price increases and higher efficiency. Can't get better than that.
Click to expand...
bicit said:
I would say it's safe to assume so. I think digikey get's priority, because the bridgelux rep mentioned digikey several times. They also mentioned that digikey has a backorder with bridgelux.
Click to expand...
Figured this information pertains with the thread. Thank you Bicit for your investigative work ;).

(He's discussing the new Vero version 2.0)
 
stardustsailor

stardustsailor

Well-Known Member
And the first spec-sheets of Bridgelux's GaN-on-Si Vertical Chips are here:

BXFD 45x 45 mil : http://www.bridgelux.com/wp-content/uploads/2013/10/BXFD4545-45mil-x-45mil-or-1.14mm-x-1.14mm-Datasheet-DS-C211.pdf

BXCD 23x45 mil : http://www.bridgelux.com/wp-content/uploads/2013/10/BXCD2345-23mil-x-45-mil-or-0.64mm-x-1.14mm-Datasheet-DS-C25.pdf

BXTA 45x45 mil : http://www.bridgelux.com/wp-content/uploads/2015/02/BXTA4545-45mil-x-45mil-or-1.14mm-x-1.14mm-Datasheet_DS-C20.pdf


Veros Ver.2 utilise - most probably - the latter.. (BXTA4545)
Except if ...
Where's that BXGS 45x45 ?
I wonder ...

http://www.mgjled.com/led4/Bridgelux Die Business Presentation Aug 2013 Romanso.pdf
 
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stardustsailor

stardustsailor

Well-Known Member
And just out of personal curiosity ,I've tried to "decypher" the internal connection of Vero 29 (ver. 1.2 ) Array 's dies .

The known values :

Vero 29 :
Number of dies : 156
Nominal If : 2100 mA (Tc=25°C )
Maximum If : 4200 mA (Tc=25°C )
Nominal typical Vf : 38.0 (Tc=25°C )
Maximum typical Vf : 40.4 (Tc=25°C )

Bridgelux dies ( BXCD4040 -BXCD4545 -BXFE4545 ) :

Nominal If : 350 mA (Tc=25°C )
Maximum If : 700 mA (Tc=25°C )
Nominal typical Vf : 3.4 (Tc=25°C )


Since the max If of Vero 29 is 4200mA and the max If of dies is 700mA ,then :
4200 / 700 = 6

So,most probably inside the Vero 29 ,under the LES there are :
156 / 6 = 26
6x strings of leds ,connected in parallel ,each string having 26 LED dies ,right ?

No !

And that is because 26 x 3.4 = 88,4 V
The typical Vf of Vero 29 at 2100 mA is 38 V .

So let us try 38 / 13 ...(26/2 ) = 2.92 V ..

Then ,Vero 29 has most probably 12x strings ,parallel connected ,each string having 13 dies .
(12 *13 =156 )

But then ... 2100 / 12 = 175 mA (half of 350 mA )
At 175 mA ,almost every Bridgelux die has a Vf about 2.92 V !
-Check the Vf vs If logarithmic scaled graphs of the dies spec-sheet-


That means -most probably- that indeed under the LES of a Vero 29,
there are 12x strings parallel connected, of 13 dies per string .

At the max If of Vero 29 ( 4200 mA ) ,each die has an If of 4200/12 =350 mA
Which means that a Vero 29 can be driven up to 8400 mA,
in order for the dies to reach their If max of 700 mA .
Still ,this is not the case ,due to efficiency drop and the cooling issues .

So ,when a Vero 29 is driven at 2100 mA ,every each one of it's 156 dies ,has an If of 175 mA.
(The radiometric efficiency of each die is well above 50% ,@ 175 mA )
Thus the increased overall efficiency of the COB array,since the dies are driven at half of their nominal If .

( When a Vero 29 is driven at 350 mA ,then each die has an If of 350/12= 29,166 mA .
An If similar of the classic small epoxy signal leds ( If=20 mA ).
But with more than 2000 times less thermal resistance than of a typical 5mm epoxy encapsulated signal LED.
( Less than 0.13 °C/W as opposed to 300°C/W )
rthleds.JPG
Let alone the actual output -compared - at ~30 mA ...
Try to duplicate that ,using 1 Watt LEDs driven at ~30 mA ...
The space & volume neened is going to be many times more ...
Let alone the MCPCB/ IMF and it's restrictions ... )

Chip-On -Board LEDs ..
What a wonderful invention ,indeed !

Cheers.
:peace:
 
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