Osram Oslon Boost HX

^ Just like XP-L HI and XHP35 HI

Well yes and know. Those LEDs also have silicone inside the phosphor and it’s not sintered (Cree has never mentioned this as far as I know). I mentioned the article regarding sintered phosphor here.

This might refer to the white stuff surrounding the die. Could be a rigid silicone with fillers.

That stuff on the PM1 is not silicone-like but seemingly rigid stuff that chips off.

djozz knows, he is a serial LED abuser.

Maybe ceramic?
Stable at high temps…
Or that white cement stuff put on high temperature bulbs:

I’m pretty sure it’s not a premolded part since it encapsulates the bond wires (see the OSRAM document somewhere above). It’s very likely molded around the mounted die.

They talk about the types of materials used here: Link

I know it’s not very “silicone-like” but that’s based on the “typical” silicones we know. Even cheap Fujik is quite different (hard and almost brittle).

The white stuff shows no flexibility at all, it breaks, and makes a scratching noise when I rub it with my forceps. It has at least the hardness of bakelite, or maybe it is ceramic.

I know, the CSLNM1 I have here are packaged in the same stuff. Again, I see no reason why this couldn’t be a filled silicone compound. It behaves like one under the tip of a soldering iron too (gets crumbly around 300°C, never melts). And the advantages in this application are obvious.

How could they cast ceramic around the die + phosphor + bond wires (nicely visible in your pic btw)? They clearly mold this in place.

Aaaaanyway… my point was that there’s fragile bond wires embedded in there and that may be why they mention not to put pressure on it.

I don’t know enough about ceramics to know that it can not be casted in this way, so I’m with you in this :slight_smile:

Asbestos :smiley:

It would have to be fired at 1000° upwards.
But it might be used here as a filler material (it’s stiff, opaque and doesn’t degrade or outgas :+1: ).

There are ceramic adhesives which are used in bulbs because of low thermal expansion at high temperatures.
Just because it is “ceramic” does not mean it is solid like a rock.
It can be made into epoxies or other stuff.

Interesting. Ceramic powder with some sort of silicate binder.

Any updates on this?

Not available yet.
https://octopart.com/search?q=KW%20CULPM1.TG&start=0

avnet lists them now with MOQ of 2000, no stock and no price:
https://www.avnet.com/shop/us/products/osram-opto-semiconductors-1/kw-culpm1tg-z6rf6-ebvffcbb-ai-3074457345638736892?CMP=EMA_Octopart_inventoryfeed_VSE?aka_re=1

LOL if we do a group buy with a 25 piece minimum…… :smiley:

I would not mind buying 25 :slight_smile:

how would these compare to a flat white and would these work good in a triple LED light with optics?.
thank you.