New Osram Oslon Square, testing a 4000K 92CRI typ. emitter

Pretty cool LED. It looks like as long as you're sticking to 3A or less the gain isn't huge (except for the lower vF), but you can definitely push it harder! Thanks for sharing.

What I was referring to (did not myself very clear, I admit) is slicing the dome off, but leave a thin layer over the die. Any illuminance increase relies on internal reflection against the cutted surface, I'm not sure how much gain that is going to give.

According to James who sells dedomed and sliced emitters here at BLF, a sliced emitter should be in between a domed and a dedomed emitter, hotspot more intense than a domed one but less intense than a dedomed, but with no tint shift.

I must say that Digikey does not seem to have the nicest emitters in stock, in a glance Mouser's selection seems better. I think for the new gen. Oslon Square you have to look at the datasheet:

-If it is from 2013 it is the old one, is it from 2014, it is the new one, I saw datasheets from feb2014, but the led of the OP has a datasheet from sep2014.

-In the introduction to the new one it mentions 'this is the second generation Oslon square', and when you look at the Vf, the old gen says min2.80typ3.05max3.25, the new one says min2.70typ2.90max3.20.

How are things going with your X6 triple square? Still planning to do this? I’d love to see beamshots of the square vs a 219b.

hmmm. I really wanted to try the GW CSSRM1.PC-MUNQ-5F7G-1. It is a 5700k LED and is rated at 259lm but nobody has it in stock.

I did find GW CSSRM1.PC-MTNP-5H7I-1 which is a 5000k at 240lm (700ma). data sheet is here

comparing it to the XP-G2, its close to the R5 but I don’t think it will beat the 5000k S2, but I don’t have all the fancy testing equipment to say for sure. The S2 is 271lm (700ma) vs the 240lm of the Square. How that looks once the current is turned up and the FV increases….who knows. The fact that it can’t be dedomed and I can’t find the 5700k version may kill me buying a Square. :frowning: I may still toy with doing a triple in something, but I don’t see using it as a single emitter right now. Not to mention it is 75% of the price of XP-G2 LED’s

I'm sorry, the idea was cancelled for now, I used one up for the dedoming experiment and now I only have two leftover. But when I do a rsonline order again (can't do that too often because I can only order with them via my work) I will include a few of these again and make the triple.

I spent a bit of time looking at the Olson spec sheets and did learn a few things

CSSRM1.PC-MUNQ-5F7G-1.

MUNQ is the luminance binning, OSRAM uses letter coding the first two letters are the min Lum. bin, the second two letters are the max lum. bin. MU (min) 259, NQ (max) 330

Same way for the tint bin

5F7G means emitter tint is 5F to 7G (look at the chromacity chart, similar to Cree chart but different tint codes) indicates 5700K - 5500K which is a pretty tight tint grouping.

and the M1 designation is the Vf

Hi Djozz, thanks for finding these leds. I have a few on order from RS, but was wondering how easy they were to reflow onto xp mcpcb’s as the dimensions dont quite match up?

Cheers Gurthang for helping to decode the part numbers, its easy when you know how! :slight_smile:

Woody

Reflowing on xp-boards works, but you have guide the led more and use not too much solder paste because it is way more difficult to squeeze excess solder out from under the led (see also post #10)

thanks to Gurthang as well for deciphering the osram code!

It seems that a bit of practice is required….good job I ordered more than I need (at the moment!)

It’s not that tight, you must have gotten something wrong when reading the chart. 5F to 7G is more like 5700K - 5300K.

I picked up a few of these and the tint appears to be a little bit green. I think I prefer the Nichias and 2700k xm-l2’s, but I will give this one a little more time.

I got the following Mouser part:

720-GWCSSRM1CCMQMS5L
MFG Part No:GW CSSRM1.CC-MQMS-5L7N-1-700-R18
GW CSSRM1.CC-MQMS-5L7N-1-700-R18
Osram High Power LEDs - White
US HTS:8541402000 ECCN:EAR99 COO:MY

Sinkpad has triple stars for these, as well as 20mm stars… No 16mm, and they are DTP, but aluminum….

I have put a couple on XP Noctigons, but the triples I cannot get all three aligned enough to do correctly, one is always off…

If there is enough interest, we could do a bulk buy of the sinkpads as they have a MOQ of 40-50 pieces…

I would be in for two, perhaps for the led of the OP, but also anticipating on the availability of the 4000K 96CRI variant of this led someday :-). Does anyone have connections somewhere to get the 96CRI in small enough quantities? At least they are not at rs-online.

96CRI? That would be something I’d like to see.
There is however going to be a change to the CRI measuring standard coming soon.

http://www.cie.co.at/index.php/index.php?i_ca_id=981

Basically, it hasn’t been updated since 1974.
“However, with the rapid uptake of LED lighting, which has greater freedom in spectral design, the need to update the CRI has significantly increased.”

This is the first I’ve read about this old LED but I like what I see. Are there any places that sell high CRI Osram Oslon Squares already reflowed on to PCB’s?

Not that I know of. I have bought mine at rs-online (without PCB) and there is not many other places selling the Osram leds. Learning how to reflow a led is not a major trick, you could have a go at it using solder paste (I use this, it works fine) and a hotplate (something fancy with temperature regulation at ~200degC is ideal, but many people simply use a pan on the stove which requires closer monitoring when the reflow is done to prevent overheating of the led). There are some extra tips to be found here on BLF if you search for ‘reflow soldering’.

Btw, Osram lists high CRI versions of the newest 3rd generation Oslon Square now, when they go for sale they will perform even better than the led of the OP/

Just got 7 of these buddies in:

They have a bunch of different Osram LEDS:
http://www.ebay.com/sch/m.html?\_odkw=&\_ssn=jwhpargos&\_armrs=1&\_osacat=0&\_from=R40&\_trksid=m570.l1313&\_nkw=osram&\_sacat=0

Many 90+ CRI LEDs

Good find, lots of Osram leds for good prices.

But mind that the type nr LCW CQAR that is in the descriptions of all their Squares are the first generation Oslon Square, while in their pictures the second generation is shown (GW CSSRM2). Sneaky!. I tested the second generation as much better! (and now there is a third gen, even better but no high CRI versions on the market yet)