There was, I removed it and re-flowed it again on to a standard 16mm star & it had the same problem. Likely a defective bad LED.
put you down for two barretttx (768 and 774) until you say otherwise, and added Basuini888 at entry 772 and 773 also.
Also added entry 775 for slowtechstef
So who is going to get lucky 777?
I sent him the LEDs. The project can continue uninterrupted.
My name is cu42 and I approve of this message!! high CRI fan here.
I never put much thought into whether any high cri could be more efficient at medium outputs since as a newb I am always focused on the max numbers.
I was originally thinking the warmer 3k was the way to go for a camp lantern, but now wondering if high CRI at 4k would be more desirable than lower cri warm tint? Is there even such a thing as warm high cri?
Last I checked, daylight tends to be around 5500K mid-day, but it gets warmer in the morning and evening as the sun gets low in the sky. At sunrise/sunset it can be below 2000K. Moonlight tends to be around 4000K, but is generally too dim to activate cones for color perception.
i have seen this project right now.
if it is possible: im very interested depending on price
This is correct.
The Kruithoff curve shows in what brightness range a specific CCT is perceived as comfortable. Sunlight with 5500K is comfortable because it is so bright! It also shows why cloudy days with very high CCTs and rather low brightness can seem uncomfortable.
Since lanterns usually produce floody light with low lux numbers, they need to have a low CCT <=3500K to be comfortable. A perfect lantern with a large brightness range would adjust its CCT with the brightness.
This is of course all somewhat independent of CRI. The CRI should be high regardless of the brightness and the tint should always be close to the BBL.
Great information on CRI 
So will their be a test
Great work by all on this project.
Thank You very much.
I thought CRI had more to do with the visible spectrum and nothing to do with color temperature or sunlight…
please count me in (interested)
It would be an even more special project if the CCT changed continuously with ramping the brightness (sort of following the Kruithof curve) . It would require leds of two colour temperatures (say 2700K and 4500K) well blended in the beam, controlled by two separate pins of the MCU.
And a fair bit of programming and tuning a new ramping table.
Please put me down for 1
added to interest list for 1 each bobkido, and ulfm1, added a second lantern for Bill63 (#425, 778)
That would make a good option indeed for those who like to change the color tint for different used, but as you said would require more components and drive the price up for the lantern.
Here are 80CRI 3500K LEDs too if you want something warmer. They would also be even higher output than the 4000K 90CRI though I realize that isn’t needed in this lantern.
Provided that a pin on the MCU is available, there is no extra components or higher price, it does require extra time from skilful BLF members.
GUYS, GUYS.
I found a source for LH351D in America!
Here it is the list if you want:
Here is 5000k 90+CRI:
Here is 4000k 90+CRI:
Here is 3500k 90+CRI:
2700k 90+CRI:
Not all available immediately though. A group buy would be extremely interesting if I could buy at least a reel of it. Anyone want to take part in it?
No offense intended, but didn’t we kinda chat about this yesterday? Digikey carries 8 varieties of the LH351D that are available by the piece, but they don’t have any stock of the 90 CRI - those appear to be special order. It would be nice if they stocked those as well, though.
Either way… I personally feel that 80 CRI would be good enough for campground usage, but I’m definitely not a CRI snob and I don’t mean to spoil anyone’s fun that has an appetite for 90+ CRI.
Oh, I didn’t understand. Sorry too if I offended you too.
To get different colors LH351D emitters though, we could start a group buy. However, I doubt we could buy 800 of them though.
The only ones that are on offer from Digikey right away are the 5000k and 2700k.
I could send 2700k LH351Ds to test them out, and see if they are more efficient that the small die LH351Bs 3000k 90CRI+.