Hello again BLF.
I hope you’re doing well today.
As you probably know, Cree recently released a new series of LEDs all the way from the 2022 new XM-L2 all the way to the XHP70.3.
Cree also did something rather different this time: they released factory domeless XHP50.3s and XHP70.3s called in the High Intensity series,
called the XHP50.3/70.3 HI.
That means you get multiple benefits:
1. Much higher throw/lumen ratio.
2. Much more consistent tint.
3. Better usability in general due to the better throw.
With the new .3 series of LEDs, you also get:
1. Much lower thermal resistance, for better driving and cooling.
2. Much lower VF for better regulation, and even more power.
3. More high CRI variants.
4. More consistent tints.
Bonus: For the XHP50.3 series of LEDs, you can drive them at 3V-6V-12V depending on your MCPCB configuration and LED config :heart_eyes:
As you probably already know, this is a fast groub buy for the XHP50.3 HI 4500k 90CRI with a 3-step color bin, one of the nicest bins actually. Not a 2-step one, but still rather close.
Being a domeless 4500k 90CRI good tint high brightness high efficiency emitter, this almost looks like the perfect emitter honestly, aside from something like the Nichia B35AM, but that doesn’t have a DTP thermal pad, and only has 6V/12V variants, so considerably less variety in terms of drive power and MCPCBs. It’s also not very tough.
I’m just doing this as a fast group buy since I have previous experience in the matter, and I know a lot of folks would appreciate to get this LED since it’s a bit expensive in small quantities and doesn’t really exist from basically any supplier currently outside of Mouser.
Anyway, here is more information about the LED itself:
- CCT: 4500k
- CRI: 90, likely with an R9 rating of 50+
- Brightness bin: H2
- Color bin: E4 within a 3 step Macaddam ellipse
- Forward voltage: 5.7V at 1.8A
- Voltage cofings: 6-12V —- Sadly, I haven’t been able to find a 3V one yet.
- Dome configuration: Domeless
- MCPCB/Substrate size: 5050, 5mmx5mm
- LED code: XHP50D-H0-0000-0D0UH245G
Tint for reference from someone who ordered the same LEDs on r/flashlight on Reddit
XHP35 HI, XHP50.3 HI, XM-L2
https://old.reddit.com/r/flashlight/comments/rz61la/nmd_i_swapped_a_new_xhp503_hi_into_an_olight/
Information about the group buy itself
As per previous group buys, to make the price per unit attractive, I need a certain minimum order quantity.
Ideally, we’d be able to order 500 LEDs to reach the lowest price. I would have liked to do 1000 pcs, but lead times within these times are killing this, and it’d still be quite a bit of money to invest in still 
Prices are currently on hold, but optimally, I’d like to reach a price of 6,35$US/LED if we get a smaller order. If we do get a larger order, prices do go down.
The price may be higher than the usual, but being a new LED with rather tight binning characteristics, it’s perfectly understandable on my part
Here is the current GB list:
1. BlueSwordm: 3x
2. Chatika vas Paus 3x
