Osram Ostar Projection PC-green tested, KP CSLNM1 F1

I received this brand new led from TheOnlyDocc, who managed to get some samples from Osram. Partnr is KP CSLNM1 F1, brightness bin 7N (lowest bin on the datasheet), chromaticity bin A. Datasheet here: https://www.osram.com/media/resource/hires/osram-dam-2494973/KP%2520CSLNM1.F1.pdf

It is clearly the same generation as the White Flat, 1mm2 die, the die is a phosfor-converted blue led with a surprisingly uniform emission surface.

The spectrum at 50mA (does not change noticably at an angle or at higher currents):

Now that is efficient!, no CRI to match (it does have a CRI of 31 btw), so no light wasted for inefficient red colours, everything goes to where your eyes are most sensitive to. The appearance is a pale green, not as deep green as a single wavelength led, and when things are illuminated you can distuinguish colours faintly.

For completeness, here's the tint:

The performance (on a 16mm XP DTP board from Kaidomain) was a surprise, I plotted the data for comparison together with the 1mm2 White Flat.

For my method see my XP-L test from a few years ago, found via my sigline.

I think it is a good achievement but to be expected that the output is higher than the White Flat, but what is the real surprise is how it handles high currents: it maxes out at almost 7A, and at 9A where I stopped the test the output was hardly less. Mind that this is a 1mm2 led Also going back to lower currents showed almost the same performance as before the 9A abuse. That makes the expectation for the HX Boost even higher.

Should be fun to make a thrower at 4-5 amps with this one.


Thanks to The OnlyDocc for sending me two of these leds.

Edit: a first test of this led in a flashlight in post#29.


Thanks for the test! Will get me a 4-5 amp driver and build a nice thrower with it.
If the new Boost HX performs similar it will be a very very interesting throw led.
To bad wavien collars are no longer available. A boost HX pushed behind specs covered by a wavien collar. Mhhh

There doesn’t exist many good aspheric hosts anyways!

Indeed. I do think there’s a market space for another. Several another.

Thanks for the testing djozz and to The OnlyDoc for donating them.
So these would outperform the XPE2 green led by a long shot?

Yup it ourperforms the XPE2 and the LCG H9RN.
And what is more interesting, this new led can handle a huge amount of current (way over spec).
If the boost HX reacts similar it will be a huge bump.
Guess they are on point with their advertising:

OSLON Boost HX makes use of the high current capability of the latest chip generation in a thermal optimized package.

Can not wait to see one in a aspheric or a very good reflector (like the GTmicro).

Thanks for the test. Nice LED for those lumen hunters. :smiley:

That is interesting about the higher current-handling ability. I thought this is basically the same as the white flat but with different phosphor? So the chip and thermal path down should be the same. Could it be that the white light phosphor produces a lot more heat than the green phosphor and that is the source of the difference?

Strictly it is not a green led and the light looks different too. But if that is not relevant its luminance is higher than anything there was before, including all white leds.

I think between his efficiency comment, the lumens being higher and spectral chart being so narrow that is likely exactly what he is trying to say :question:

Albeit it looks pretty good this one is still untested around here: http://kaidomain.com/S027435-DIY-LED-Flashlight-Host-130mm-x-47_5mm-Black

I mean it looks OK but if it doesn’t beat the Z1 it doesn’t interest me. A fixed thrower aspheric with a slightly larger lens would be even better.

thanks for the test!good results.

White flat and "Green" flat have the same thermal resistance, so max. currents should be similar, green flat peak could be a little bit higher (0.5-1A) due to higher efficiency and lower phosphor loss.

So I think this confirms your white flat test was probably with sub-optimally reflowed LED since I got 5.75A peak, almost 1A higher than what your test shows.

Yes, I considered that. Funny thing is that this time the reflow was done with less care (more solder) than with the White Flat test. So I do not rule out that this difference is real. I may re-do the White Flat test although it is less fun to re-test stuff than something new :weary: (and it costs me another led, ).

How about this: I'd like to send you 9 LEDs, 3 soldered by me, 6 bare + 6 3030-20 DTP boards + small amount of lead free solder. You should solder 3 LEDs with your lead paste, and other 3 with my lead free paste.

So you could finally test lead vs. lead free solder,and also see if soldering technique has any visible effect, white flat is best LED for that test since it has smallest thermal pad (3x1mm) and highest power density (W/mm2).

3LEDs for each test is to eliminate "luck" during soldering and LED thermal resistance variance.

That is quite a few hours of testing but it sounds like that will generate some useful data, let’s do that. But we can not set a hard deadline for this, having a family, and with always the possibility for the need of extra care for my son, my hobby-time can spontaneously evaporate at any time, so things must be postponable.

Wow, that is some hardcore BLF cooperation :+1: :+1:

Is there a red version available, too?

there is the KR CSLNM1.23
datasheet: https://dammedia.osram.info/media/resource/hires/osram-dam-5961110/KR%20CSLNM1.23_EN.pdf
617nm, up to 2500 mA and then just over 300 lumen. Probably an upgrade over the red XP-E2 but it is not a phosfor-converted red but a classic single wavelength led. I expect it can not be overdriven like blue leds can.