testing a Osram Oslon Square 3500K 80 CRI

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djozz
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testing a Osram Oslon Square 3500K 80 CRI

Official specs: Osram Oslon Square, nr LCW CQAR.EC-MRMT-5O8Q-1 , 3500K, 80CRI min.,  angle 120 degrees, output 210-259 lumen at 700mA

The last of the batch of Oslon leds that I tested recently is the Oslon Square, I believe it to be the latest high power led in the Oslon series, although according to flaslightwiki it was first announced in november 2011. Of course for the best output I should test a cool white low CRI one, but being me I chose a 3500K 80 CRI (min.) led. I assume that apart from the lower output all other parameters should be comparable to a cool white one. The set-up (no picture this time, see my other led-tests for a look at my improvised set-up) consisted of the led reflowed onto a copper xpg-Sinkpad (it fits, but the solder pads do not completely match, resulting in that the led does not 'suck' into place like a xpg or xpe, you have to push it down or just use the right amount of solder paste), screwed (Actic Silver in between) on a block of aluminium, with a reflector placed on the board facing the white ceiling. The led was directly connected to a power supply, the current reading through the led was provided by the power supply, the voltage was measured by a DMM clamped to the led-wires.  My lux-meter measured ceiling bounce lux-numbers, flashlights with known outputs were used to calibrate the numbers so the lux-numbers could be converted to estimated lumens. I tried to be as precise as possible, but my method/equipment is humble and limited so take the numbers as an indication of what is going on with this led, not as the absolute truth.

In the graph I compared this led to a XP-G2 measurement i did a few months ago. There is two things to consider when comparing the two leds, 1) the XP-G2 led had a AR-coated lens on top of the reflector, while the Oslon Square did not have one (for fairness add 1 or 2% to the XP-G2 values), 2) a 3500K 80CRI led will not perform like a 6500K 65CRI one, see below for a discussion of how to compare those.

Three observations from the graph:

1) the Vf of the Oslon square is very comparable to the XP-G2, so (at least up to 4A) it can be used as a direct replacement to the XP-G2, it can even be reflowed to a xpg-board although the solder pads (of all Oslon leds) do not match fully (see above).

2) the maximum output of the Oslon Square is reached at about 4,5A, which is respectable, but the XP-G2 can be driven harder.

3) up to 4A the Oslon square 3500K 80CRI measured an output that is 79% of the output of the XP-G2 R5 (I compensated 2% for the AR-lens). Now for a reasoning that I think is about correct: in Cree xp-bins 79% of R5 would be between Q5 and R2. If you look at the Cree version of this led, the XP-G2 3500K 80CRI led, it has a maximum bin of R2. So if the phosfors of Osram and Cree behave roughly similar in output when going from cool low CRI to warm high CRI, a general conclusion might be: the Oslon Square performs as good as the XP-G2, at least up to 4A. (this debatable line of thoughts would not have been necessary if I just had tested a cool white led, sorry about that Wink )

 

I thought the led was nice enough to swap the xpg2 R5-3D that was in my Maratac copperAA, that I found too cool for a copper light ;-). For this flashlight I was already waiting for a while for the xpg2 3500K 80CRI to become available through one of the for me accessable dealers, but nothing happened sofar, I'm glad this one came along. Some pictures:

There it is in the Maratac pill. To my joy the board size for this pill is 10mm, so I could use one of the brand new VoB 10mm Sinkpads Smile . The solderpads for the led-wires on the 10mm sinkpad were too close to the led to clear the reflector, I had to solder the wires to the outer edge of the pads and scrape excess solder away. The reflector was electrically insulated from the wires with two layers of Kapton tape.

There you go, looking good in that light.

 

Not dead-centered, but the led was not dedomed and the OP-reflector is very forgiving: a good beam! And a picture of the front end of the light (on high) through an audio-cd, to see the die in action (led was centered worse in this picture, I improved that later).

White wall shots at 2.5 meter, fixed camera settings with white balance on daylight, left before, right after, the Oslon seems to give a just a bit tighter hotspot:

 

Performance results:

output on xpg2-3C: 330lumen, on Oslon Square 3500K 80CRI: 250 lumen

current draw was (as expected, the VF is virtually the same) 1,22A on both leds

throw on the xpg2-3C: 2.75klux at 1 meter, on Oslon Square 3500K 80CRI: 2.2 klux at 1 meter

This all compares well to the results from the graph.

 

Finally a few lights on high setting together, pictured through a audio-cd, to compare the die-sizes and shapes.

The leds from left-under to top-right: Oslon SSL80 4000K 95CRI, Nichia219 4500K 92CRI, XP-G2 cool white, Oslon Square 3500K 80 CRI

The Osram Oslon Square appeared to be a nice surprise to me! I tried to find these kind of test results on the internet, but apart from official spec's I did not find much, which is a shame really because in this case the led is on the market for two years and hardly ever considered for flashlight use (but there was a Surefire rumour..).

Thanks for reading!

Edited by: djozz on 12/01/2013 - 10:07
djozz
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Here's a nice stereo pair I made of the led (stereo photography was once a hobby of mine). If you can get your eyes to look parallel (it helps to start with your eyes very close to the screen and then move back until the image is sharp), you see 3D (I hope that your screen resolution is similar to mine so that the pictures are not to far apart):

    

Old-Lumens
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It's interesting, but I could see where it might go unknown. It doesn't win in the lumens department, compared to the well known and easy to get Cree XP-G2 and it doesn't win in the CRI department with the Nichia 219.

It's something different and something to ponder, but I can see where it would not be much sought after in the flashlight arena.

Thanks for the good info on it though. Much appreciated.

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Nice work again djozz. Its interesting to read about these items that would otherwise go totally unnoticed.

 

djozz quotes, "it came with chinese lettering that is chinese to me".

                      "My man mousehole needs one too"

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djozz
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Old-Lumens wrote:

It's interesting, but I could see where it might go unknown. It doesn't win in the lumens department, compared to the well known and easy to get Cree XP-G2 and it doesn't win in the CRI department with the Nichia 219.

It's something different and something to ponder, but I can see where it would not be much sought after in the flashlight arena.

Thanks for the good info on it though. Much appreciated.

I have been testing this 80 CRI led because I had a use for it, but the Oslon Square comes in all sorts of tints and CRI's, including cool white 65CRI and a 90+ CRI up to 4500K (XP-G2 does not have the 4500K 90CRI option, but then: Nichia does..). I would like to test the Oslon Square 4500K min. 90CRI against the Nichia219 4500K 92 CRI, but I can not get this led at rsonline (my only affordable source), they even do not have it at Mouser or Digikey (of which the shipping is too expensive for me anyway).

But you are right, a led must not perform just as well, but has to convincingly beat a Cree led in some way to become popular (the Nichia 219 high CRI made it because Cree did not do high Kelvin high CRI leds), for Cree's (with matching copper boards now) are widely available in the flashlight community and Osram and Philips leds are not.

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Ohh, 4500K 90+CRI.
No rsonline, Mouser or Digikey. :~ Have you seen any supplier with them?

The oslon SSL 80 LCW CR7P.CC and SSL 150 LCW CRDP.CC ?

~ Edit ~

Rs-online (Netherlands) seems to say the ssl is in stock. oslon SSL 80,White 4500K CRI:90 Min , ssl 150 At least thats what google translate says they are saying. Big Smile
No ssl 80 4500k 90cri on mouser or digikey but ssl 150 4500k 90cri is on mouser with a 10 week lead time.

Oslon SSL has the same pad layout as oslon square.

CRI min 90 (typ 96) vs 92 typ for our nichia 219s.


Counterfeit 18650s, 2,<a href=“http://

djozz
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Helios- wrote:
Ohh, 4500K 90+CRI. No rsonline, Mouser or Digikey. :~ Have you seen any supplier with them? The oslon "SSL 80 LCW CR7P.CC":http://catalog.osram-os.com/catalogue/catalogue.do?favOid=0000000b0002c8... and "SSL 150 LCW CRDP.CC":http://catalog.osram-os.com/catalogue/catalogue.do?favOid=0000000b00034f... ? ~ Edit ~ Rs-online (Netherlands) seems to say the ssl is in stock. "oslon SSL 80,White 4500K CRI:90 Min":http://nl.rs-online.com/web/p/products/7781232/ , "ssl 150":http://nl.rs-online.com/web/p/products/7781254/ At least thats what google translate says they are saying. Big Smile No "ssl 80 4500k 90cri":https://www.google.com/search?q=LCW+CR7P.CC-KSKU-5J7K-1 on mouser or digikey but "ssl 150 4500k 90cri":https://www.google.com/search?q=LCW+CRDP.CC-KSKU-5J7K-1 is on mouser with a 10 week lead time. Oslon SSL has the same pad layout as oslon square. CRI min 90 (typ 96) vs 92 typ for our nichia 219s.

I recently did test a Oslon SSL80 4000K 96 typ. CRI in another thread, although it was 4000K instead of 4500K and it was not the newest version (with a white backing) of the led (but in output the difference is not great between the led I tested and the newest version). The 80 degrees angle of the SSL80 works very nicely in a flashlight, both in reflector lights and aspherics, the output was less than the Nichia219highCRI.

Jerommel
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Oof ! That Vf is quite high…
Just looking for a test of these, which i’m using now, almost 5 years later, in my scratch build contest light.
Glad i only run them on 1 Amperes each (in a triple)..
Didn’t expect to see them tested up to such high currents.
I considered these LEDs to be 5 Watts maximum.
Thanks for testing these 5 years ago, Djozz. Party

djozz
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Thumbs Up good luck with the build. At least this generation of Squares still had the nice rosy high CRI versions, while the later generations were greener.
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Yeah, definitely quite rosy, which is very nice for warm white (i use 2700K “typical 96CRI”).
A lot of deep red too, as far as i can tell.