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.
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.
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.
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
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.
Current handling should be at the absolute minimum on par with the XM-L2.
It’ll obviously be able to reach much higher power levels since it’s a flip chip design rather than having to deal with bond wires, so that’s nice at least.
If I were to extrapolate based on the 70CRI version, I’d say 1000-1100 lumens at 10W 85C, and slightly higher at the rated 25C.
For the 90CRI version, I’d say around 700-800 lumens at the same power, although we’ll have to wait until we get to manufacturing and testing to see what the manufacturer gets on their end, and then see what we get on our end.