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

Yup, Reddit will bump this GB

I’m in for 20.

Isn’t rayten-lighting.com their website?

This looks like 5050 led in question

I found something interesting

This looks just like the natural white version Yinding 5050 so maybe the are the actual manufacture of that?

Imagine a high cri version of that led :smiling_imp: :smiling_imp:

Damn, you actually found the manufacturer website only a few minutes after I found it.

You must be quick AF.

And yeah, you actually found that COB LED.

Sadly, not the same manufacturer.

Ah…how weird! Even when I search “rayten-lighting” or with the .com, google refuses to show it to me! What’s up with that.

It’ll be interesting to see how they test. Kinda looks like they won’t handle the heat of overdriving them much…marketing specs vs. graphs don’t quite jive (particularly concerning is that Vf/If graph…). I think for my plans that’d still be fine and hopefully the temp/tint is nice enough.

Not sure what to make of the nice furnishings and Latin gibberish on the single entry for Industry News: News Fifteen: weolcome to our website

Eh, I’m not really worried about overdriving potential.

It’s still got a good low thermal resistance(2C/W), so a bit lower than the LH351D and a decent bit lower than the SST-40, which itself can handle a nice bit of power.

If that’s accurate, with the 125°C Tj also. If that graph is accurate and applies, it’s hitting around 3.2V at 1A. Looking at the steepness of that line I don’t see how the stated 4A max is possible on a single lithium cell, looks like even 2A might be asking a little much from it, maybe? I dunno…proof is in the test once in hand. :slight_smile:

I’m in for 5!

@Correllux, yeah, it’s actually a bit higher than the LH351D and close to the XP-L HD in terms of VF (looks about 3.05V at 1A).

Certainly not bad, but nothing like the monster low VFs we’ve had these recent times.

Very important though: these numbers are at 25C on a actively cooled desktop heatsink.

I’m not surprised their numbers are higher than all of the other manufacturers which test their VFs at 85C…

That means real world VF will be quite a bit lower.

Good point…I did notice that but it’s a head scratcher because they are stating ambient temperature, not junction or solder point, and there was no temp indication at all on the Vf/If graph. The voltage drop isn’t much, though…comparing the SST40 the difference between 25C and 85C is like 0.07V, less than a tenth. Dunno…let’s see how they do. I hope these will be nice in a couple of host projects I have in mind.

Also….curious. They have that LeiTeng logo on the ali and web site…and they are mentioned in the notes of the datasheet. Also mentioned in the datasheet is Kasin. As if those two names are manufacturers. I know borrowing and copying is the accepted standard but three names juggled about. Would the real company name please stand up? lol

So, talking with my contact, I’m realizing something.

Even the smaller/unknown LED manufacturers can produce perfectly fine LEDs and whatnot, it’s just that generic luminaire/lighting manufacturers often ask for the absolute cheapest LED prices, making for stuff that’s rather unsustainable in business.

That obsiouvly requires corners to be cut, and not caring much about QC. scinating to see that basically everyone can make good stuff if they’re actually paid enough.

It’s really interesting talking someone who’s actually concerned about this and telling me this directly, and honestly kind of refreshing.

I’m now waiting to get beamshots to see if we get a donut instead of a waffle design.

Edit: Good news! Donuts shouldn’t be an issue because of the design, which is very nice.

Update 1:

1. It’s been confirmed by the manufacturer, but donut holes are not officially not an issue:

“because of the no dome lens design, classical focusing holes are not an issue with this LED design.”

2. QC will not be an issue:

” We work with a lot movie industry customers which have very strict specifications like yours, so it is not an issue.”

In for 10pcs pls. Thanks.

I’ll take 10. Thanks.

10 for me, please :).

Finally something for my EYE10.

All added to the sheet.

Added to the list.

So what current can these be run at, and what output are you expecting?
4000-4500k is quite the range, I’d be more inclined to order some if they were closer to 4000k

Maybe. I’ll ask.

Personally, I prefer closer to 4500k, but I know some people prefer 4000k, so it gives us a range of stuff and perhaps in the middle.

What really matters to me is tint binning.

I’m on board with 4500K, too…wonderful temp when you can find it. I’m more of a 5000K guy usually but good 4000K is ok, brushing up against as warm as I like. 4500K is like HID crisp without being white-white or harsh.

Oh I agree! I’d prefer a nice 4500k over a green 4000k. But ultimately I’d love a slightly rosy 4000k!

Any idea on current handling and output?