BlueSwordM LED Group Buy 3: a 3V 5050 domeless Ra9070 4000-4500k LED, the perfect XM-L2/SST-40 (UPDATE 2: Something new!)

Here’s the datasheet in question:

Now, I don’t want to be judgemental, but these graphs seem a bit… odd. Almost seems like they got it from somewhere else.

The link doesn’t work.

5C°/W is not very good, especially for a 5050 LED, that’s 219C level of thermal resistance (4.2~6.4), first gen XM-L2 is 2.5, new gen 0.75, SST-40 : 0.8

Yeah, that’s what I figured as well.

Here’s a fixed link:

I just wanted to know you guys’ opinion.

Man, I just wish Luminus had released a high CRI SFT-40 honestly. Imagine how much time we could have saved :stuck_out_tongue:

Datasheet does look a little suspect but if any of that is to be believed then these look like fragile dim emitters. 900 lumens at 3amps on a 5050? Reflow info doesn’t make them seem very robust…maybe the info taken altogether suggests that they wouldn’t be very good in a flashlight host where things are cramped and hot.

Still waiting to hear back again from my Luminus fellow on whether high CRI and/or lower temps are in the cards for those emitters but if so we’re looking at probably more than a year away. (I wonder if, say, Hank and Simon and Sofirn were to get together and request several reels if Luminus would make a special run……the dream team collaboration. lol)

To be fair, the LES seems to be quite small. I wonder how small it really is, which is one of the questions I asked.

I was going to be happy until I saw the thermal resistance specification.

I would be concerned with a low Vf and high thermal resistance, sounds like it would be easy to drive to death!

My impression is with companies like Nichia and Luminus you have to be regularly ordering hundreds of thousands of high power LEDs before any kind of customization would be on the table. Nichia won’t even sell their low yield special chromaticity bins to regular customers ordering in the tens of thousands.

@bob_mc_Bob, not hundreds of thousands.

MILLIONS.

Well then, these big emitter companies have just gotten a bit to big for their britches, haven’t they. :slight_smile:

I’m not in for a million…much as I might like to.

Anyway, some color information about the other LED:

Man, it’d be so nice if it had lower thermal resistance :confused:

Some more pictures:

Currently in the process of getting a close up picture of the whole LED so we can estimate the LES.

Dude...!

It’s not a very high res picture, but measuring it in CAD shows between 1.35mm sq and 1.8mm sq, depending on whether it is measured from the fuzzy part of the outline of the phosphor or the more solid part.

Slurp

The manufacturer and our contact is really dedicated, god damn :slight_smile:

They don’t know the LES of their own LED so you have to ask high res pictures to estimate it ? Lol

I got this using webplotdigitizer : 1.53x1.17 = 1.79mm2

SST-20 is 2mm2 I think ? so it’s quite similar, no dome, but probably lower current handling as SST-20 thermal resistance is 1.6C/W

That’s something that’s really strange about a lot of manufacturers that I’ve dealt with outside of Getiand and Rayten.
LES stuff doesn’t seem to be something they put in the datasheets lmao.

How come they can’t give me every detail possible about the physical parameters of the LED?

Anyway, with the amount of money I would need to invest to and the rather high thermal resistance, I’m not sure we should go with this LED, even though it looks a lot more… interesting than the Rayten LED (Ra9580 and much smaller single LES).

With the new picture I get 1.95mm sq.

So 2mm2. About as small as the SST-20, but domeless.

If only it had much lower thermal resistance and was cheaper, because as it stands, this one costs a lot more than 2$US, even in bulk lmao.

So, fogofwar will test the LED next week:
“Ah I haven’t had time this week. I’ll try next week”

I’m patient, but hopeful :slight_smile:

Anyway, I have an idea about the other LED. We won’t be doing a group buy for it, but after the Rayten GB ends, I think we’ll be able to do something else :stuck_out_tongue: