The two sample emitters came already reflowed on Led4power’s DTP MCPCBs. One 16 and one 20mm.
During preliminary testing I found out that the spectrum, CCT and CRI were practically identical on both samples. I did the rest of the measurements on only the one on the 20mm board. The 16mm MCPCB I installed in a Convoy S2+ for further practical use experimenting.
I used the orange peel reflector from the S2+ on all the tests.
There is no real need to use diffusing optics or d-c-fix for example. The beam has little tint shift and most importantly no off tint corona. The little shift it has is quite linear and gets a bit cooler towards the spill. I’d rate this very good.
Tint shift measurement run at 1A LED current.
The tint was only slightly on the green side of the black body radiator line, but nothing serious. On higher currents the tint moves a bit closer to the BBL but from the trajectory it seems that it will not reach it. A light minus green filter fixes that, since the tint shift is not very visible. The tint vs. current movement along the BBL makes correcting it easier as well. I would rate the overall tint quite good and easily correctable even for the snobbiest of users.
I made a quad with this and love it. To me it makes the Nichia 219C 4K look way too rosy by comparison. You wouldn’t think it seeing the Nichia by itself but once you have them side by side it feels like that, color rendition aside.
thanks for the great info and graphics maukka
too bad there is no 90+ CRI
the present samples have negative R9, not a good thing in my snobby world
I do like minus green filters, they have helped me a lot
I use a 1/2 minus green on my Olight S1 Mini High CRI and it makes the green tint much less noticeable, but it would be nice to buy an LED that did not need a filter, especially on lights like the S1 Mini that cant be opened to put the filter under the bezel.
good thing Im so picky, it makes me accumulate lights more slowly
But in direct drive with same config that powered xp-l2 with 5Amps you will get something like 7.5Amps with 86lm/w.
For linear drivers like LD-*4 you can just compare lm/Amp. 1653lm XP-L2 vs 1820lm Luxeon V, both @5A.