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

This sounds great! These fit on an XPG star?

Where do I buy the correct one?

These fit on a XP-star with some extra care. You better not start with a big surplus of solder and then squeeze out the excess, like you can do with Cree XP-leds, but use a moderate amount of solder, and gently push the led into the middle, then you get a decent reflow.

This exact led can be had at RS-online and Digikey, for the partnumber see the OP, they will have others tints and bins as well.

I am a bit doubtful if these can be dedomed succesfully, unlike the first gen. Squares the phosfor looks blended with the silicone. I have none spare for a dedome test at the moment.

I paid (with shipping included) about $3 per emitter, about XP-G2 level I guess. Dedoming this one does not look promising, see post above, who is going to try?

I can always count on a kind reply from you Steve, I appreciate that!

And thanks for the other replies as well :-)

Nice work, again, djozz. Much appreciated :beer: :beer:

How big is the dome compared to an XPG2? Will these fit inside an unmodified Carclo triple TIR optic?

Oslon dome 2.2mm dia, base of dome 2.6mm
XP-G2 dome 3.06mm dia

Carclo triple TIR shouldn’t be a problem.

I don’t need 5 more medium sized LEDs just now, but this looks like real progress. Hooray!

Thanks for the test, djozz, excellent work. These new Oslon Square look very promising. I hope we’ll see a dtp-copper-MCPCB for them, especially a triple-version.

+1 :bigsmile:

As expected dedoming fails: much of the phosfor is mixed with the silicone. I tried the hot method but usually then the gas method does not work either. You could try slicing the dome to close to the die, but I'm not sure if you improve the illuminance with that...

(stereo image)

I have a headache trying to find one of the new square LED’s on digikey in a cool white. If somebody can find it and post a link I’d appreciate it. Djozz, I couldn’t even find the one that you listed. I found a lot that had similar part numbers but not the same. Like you said, the Osram part numbers make no sense!

I think dedoming will always increase the luminance, unless there is an air space between the die and the dome, as with the XP-L. The total internal reflection at the air where the dome used to be reflects light back into the phosphor, making it brighter. The dome in your picture looks different shaped, but that outer surface is just passive optics.

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