LED test / review Osram SYNIOS P2720 DMLQ31.SG white - Small chip, but big in luminance - at low current!

Thanks for joining us koef3.
Good testing review.

Thanks for great test on led. Welcome to BLF.

Yay I was waiting for this!
I’m gonna buy some and see how much more cd/mm^2 I can get with the cooling I use.
Thanks for the test :slight_smile:

put this led in BLF GT :smiling_imp:

Doing that will get close to 3Mcd without a wavien collar+lens setup :wink:

Thanks for the review.

This is going to be a thrower killer although will be hard to focus the beam due to base not square

When you reflow it onto an XP board, the large LED pad goes on the center PCB pad and the negative PCB pad is left empty.
The result is that the emitting square of the LED is perfectly centered on the MCPCB.
See here:

The whole rectangle looks off center but the die isn’t.

thanks Enderman

where can i buy this killer LED? :slight_smile:

Both the DMLQ and DMLN are available from mouser.
I always order in sets of 10 in case I fry one or damage it when trying to reflow.
There is a price break at 10 units.
May not be the best choice if you’re on a budget, maybe just buy 2 or 3.

Koef3, do you think a bit higher throw performance and warmer tint could be obtained if dedoming?

It seems the silicone layer on the die is really thin, but a warmer tint would be worth it.

Very cool led, thanks for the test! I think I will get me both versions now and see how I can make them work in a flashlight.

In the past the phosphor layer of most Osram is more like a paste and not really solid as we know from other LEDs (Cree XP-G2, XM-L2). If it is dedomed in chemical way the phosphor came off the die too. I didn’t try a dedoming of the SYNIOS myself.
Since the SYNIOS is dedomed already, I don’t think that a higher throw performance (or luminance) can be obtained. But as I said, I didn’t test this, and my samples available are needed for a SYNIOS compilation test with comparison of all types.

Interesting on the other hand is the light color. If I mix the light of my DMLN31.SG sample up (in ceiling bounce or wirh diffusor) the color changes from white with some blue to a really nice cool white with a little bit rosy or red in it.

Has anybody told luminarium iaculator about this?

Ooh, i want to try this too.

I forgot:
Welcome to BLF, Koef3. :slight_smile:

Great news, thanks for another comprehensive test! :slight_smile:

I just did a test on my DMLQs and found them to top out at around 155cd
155/.503 = 308cd/mm^2
This is slightly worse than my DMLN LEDs did, those got up to 327cd/mm^2
Of course my tests are a lot less scientific than yours so i’ll probably try reflowing a few more another day and testing them again directly against the DMLN.

I wouldn’t be surprised though if the smaller LED gets higher intensity because of less heat.
That would make more sense, since other than the die size they’re the exact same LED type and manufacturing.

I am stuck with old XP-G2 S4 2B but who knows what future brings.

Thanks for beautiful review :+1:

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A couple mods with this LED have been done and the measured in-flashlight candela values were slightly below the dedomed XPG2.

The picture above of the lit LED and of djozz’s aspheric lens beamshot show that there is significant light coming from the areas to the side of the die. This extra light could artificially inflate the calculated luminance value (315cd/mm^2). Maybe this is not the intensity king after all.