Alright, all the shipments sent to U.S. on Dec 1 are now officially write-offs (at least for the tracking begins with LX——-), as the PO has reported to me.
I bought some 5800K, then some 3400K when it became available so now i want the 2300K but would like to wait for the 4000K if there is a chance they'll be available soon.
I don’t know in which pile in which part of the world they are but this package is really slow, sorry about that. I will check them as soon as they get in.
Finally the 4000K samples arrived. And these are a surprise. I checked 3 leds at 30mA.
*First, they are not 4000K but 5000K, what is a disappointment because that makes them less special.
*The beam is nice and smooth, I checked three leds, and there are no visible tint shifts over the beam, one of the 3 leds has a slight unevenness in the hotspot, which would annoy a purist but does not affect a normal user. The other two beams were perfectly smooth.
*output: 15 lumen at 50mA, 120mA does not kill the led. (no output curve is not measured yet)
The beam btw is much narrower than the Yuji leds, maybe this is a 30 degrees led. Beam (30mA) at 30cm from wall:
On my tablet it looks like the center is a bit rosier and the edge a bit greener, this is not what I see in reality, as posted above there is no obvious tint shift at all in the beam.
The closest previous 5mm led from rngwn was a 5800K one, a short test elsewhere in this thread: link. I’d say it is about equally good, output slightly less, colour rendering slightly better. But I like the narrower beam of this new 5000K led a lot, makes a very useful beam that is a bit brighter.
Here are the two leds together plugged in parallel into the same power supply, 60mA among them. That tells that the voltage can not be much different as the outputs a similar ( but I think the 5000K voltage is a bit higher so that it receives a bit less than half of the current) :
The tints in the picture came out rather close to reality (on the screen of my Sony phone at least).
But hey, the good thing is that 3xAAA lights are wide enough for 21700 cells.
With some wizardry it is often quite possible to get all 70 millimeters in there too.
But sub C NiMH cells now have become interesting too.
Gives you enough space for a boost driver (which you’ll need).