Osram Ostar S2WN

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Agro
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Osram Ostar S2WN

Not sure if it’s a new LED but I don’t remember seeing it…

Osram has a 4mm² quad die LED, probably based on White Flat:

  • rated for 12A
  • thermals only marginally worse than White Flat
  • 4.65×5.75 mm package
  • each die is electrically separate
    • this LED can be 3V or 6V or 12V depending on MCPCB
    • would it outperform White Flat with only 1 die driven? Thermals could be better…but they don’t seem to play that big role Wink
  • 0.07 mm between individual dies
    Click

Glenn7
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So if each die is electrically separate then, in theory, you could operate each one to make it for throw then to a wider beam. but tuning would be a nightmare as the one that throws would need to be bang on in the center making the beam shape funky.

HONDARIDER
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Are these available anywhere currently?

Agro
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Glenn7 wrote:
So if each die is electrically separate then, in theory, you could operate each one to make it for throw then to a wider beam. but tuning would be a nightmare as the one that throws would need to be bang on in the center making the beam shape funky.

Interesting idea. I had a similar one and they would work well together.
Do a triple or a quad. This will enable making the beam symmetric.
For beam tuning 3d print asymmetric spacers.
Glenn7
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Or a sliding/rotating pill to center it… maybe

DavidEF
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Agro wrote:
Glenn7 wrote:
So if each die is electrically separate then, in theory, you could operate each one to make it for throw then to a wider beam. but tuning would be a nightmare as the one that throws would need to be bang on in the center making the beam shape funky.

Interesting idea. I had a similar one and they would work well together.
Do a triple or a quad. This will enable making the beam symmetric.
For beam tuning 3d print asymmetric spacers.

Oh yeah, if you can find a quad reflector that has openings large enough, or modify one to work. Put one die of each emitter in the center of it’s reflector opening, in a way so that the other dies are on the “outside” edge (radially symmetrical) but still in the opening of the reflector. Turn on the one centered die in each reflector when throw is needed, and all the dies when flood is wanted.

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

Agro
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It won’t really be flood+throw, rather throw+medium beam. With all dies on it would still have a similar hotspot, but the extra emitters would create a wider secondary beam, lighting up larger area with lower intensity. And they would make spill much brigher.
Interesting for MT09R-like light that “throws flood”…

DavidEF
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Well, I’m thinking with 3/4 dies out of the center of focus, the majority of the light will NOT be in the hot spot. To me, that would be a flooder.

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

Glenn7
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Yep when we 3 invent this light we will be the talk of cpf and we might make a buck to Wink

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I actually ordered this led w a copper square mcpcb, not sure if its Direct thermal path. They should be here any day now. I’ll do a simple bench test first. After I figure out the #s it will most likely take up residence in a MF02 (70mm ish reflector) if there is intrest I can post up my findings?

Sometimes being a newb is the best part of a hobbie.

M.O.B. I mean C

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Redlyne22 wrote:
I actually ordered this led w a copper square mcpcb, not sure if its Direct thermal path. They should be here any day now. I’ll do a simple bench test first. After I figure out the #s it will most likely take up residence in a MF02 (70mm ish reflector) if there is intrest I can post up my findings?

I’d love to see your results! Grad

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

Glenn7
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Redlyne22 wrote:
I actually ordered this led w a copper square mcpcb, not sure if its Direct thermal path. They should be here any day now. I’ll do a simple bench test first. After I figure out the #s it will most likely take up residence in a MF02 (70mm ish reflector) if there is intrest I can post up my findings?
Thumbs Up waiting to seeeeeeeeeeeeeee…………………………………
Redlyne22
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Sometimes being a newb is the best part of a hobbie.

M.O.B. I mean C

SKV89
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Love to see your results. This a very interesting emitter if it is based on white flat. Maybe a good replacement for the XHP35 HI

EasyB
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I have some preliminary results with this LED. I ordered a couple bare LEDs from yinding on AliExpress. Oddly one came with one of its phosphor squares missing under it’s glass cover.

The dealer sent me a replacement no problem.

I used the aluminum DTP color XML MCPCB from Mtnelectronics. All 4 dies are individually accessable so I had to wire all the pads + and – in parallel, which was a pretty big pain. I had some issues with some small shorts between one or more of the pads at the LED footprint. The reflow seemed fine at first but when I was testing the LED and getting it hot the short got bigger until it was about 10ohms. I guess it was some flux residue. I redid the reflow and the same thing happened again. I guess normally we don’t have an issue with this because the + and – footprint pads are usually not so close together as in this case. Anyway this was another pretty big pain that I don’t quite understand.

I put it in an EE X6 head and did some quick testing. At about 13-15A the output was about 20% more than a dedomed SST40 in an X6 at ~8.5A, based on ceiling bounce. This is pretty good, maybe the highest output 4mm^2 domeless LED around, but not as high as I was hoping considering it is like 4 1mm WFs. It’s possible this is not a very high bin. The throw, unfortunately, was killed by the dark cross between the dies. I measured 70kcd in the X6 at around 12A.

I was hoping this LED could elevate the much loved 4mm^2 class of LEDs, but for me it’s not quite bright enough to deal with the hassles, and the beam suffers from the same donut hole and poor throw as most other 4-die LEDs.

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Thanks for the time and work and your findings EasyB!

Lexel
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MCPCB is a big hassle with this LED, not like others where you can short both sides for low voltage here you need basically 8 individual traces to the pads

Depending on where you got those from and that you got one with missing phosphor those are very likely some engineering samples or factory rejects

Marc E
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Cheers for the effort and for sharing EasyB!

Firelight2
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DavidEF wrote:
Well, I’m thinking with 3/4 dies out of the center of focus, the majority of the light will NOT be in the hot spot. To me, that would be a flooder.
I think the idea would be to have 1 of the 4 dies focused and running at max power for maximum throw with small hotspot.

For flood mode, activate all 4 emitters, but probably with each die at a lower power than the 1 emitter in spot mode. Basically, get the effects of a White Flat for throw and an XHP35 for flood all out of one emitter.