Cree and Seoul both test their LEDS with pulse currents as well. That is how they rate their parts at a die temperature of 25C. The only way to do this is with pulse testing. It does not represent the real world, but it is consistent.
I am pretty certain these parts do not have anti-droop. I do not think that is going to be later (much?).
The Seoul P4 is interesting, but the spectrum as far as I am concerned has been tuned for specifications, i.e. high lumens, not necessarily useful light. The color rendering can be very poor depending on the subject. They use the same die as Cree, so you can see how many more lumens you get by changing the phosphor. The Cree parts have much more consistent color rendering and for flashlights where you never know what you are going to be lighting up, I think they are much better.
If I am interpreting the Rebel data sheet correctly, the 80 lumens is a minimum, the 145 is a typical so I do not think anything is wrong there.
One thing that I found interesting is that the Rebel is rated for its 50K hours at 135C, not 85C like Cree. While the Rebel is only rated for 1A, I wonder if we can drive it hard based on this with reduced life or it will just fail quickly. Should be interesting to find out, however, until we can see more parts, I will keep playing with the XRE.
Semiman
I am pretty certain these parts do not have anti-droop. I do not think that is going to be later (much?).
The Seoul P4 is interesting, but the spectrum as far as I am concerned has been tuned for specifications, i.e. high lumens, not necessarily useful light. The color rendering can be very poor depending on the subject. They use the same die as Cree, so you can see how many more lumens you get by changing the phosphor. The Cree parts have much more consistent color rendering and for flashlights where you never know what you are going to be lighting up, I think they are much better.
If I am interpreting the Rebel data sheet correctly, the 80 lumens is a minimum, the 145 is a typical so I do not think anything is wrong there.
One thing that I found interesting is that the Rebel is rated for its 50K hours at 135C, not 85C like Cree. While the Rebel is only rated for 1A, I wonder if we can drive it hard based on this with reduced life or it will just fail quickly. Should be interesting to find out, however, until we can see more parts, I will keep playing with the XRE.
Semiman
That still makes the 80lm part not quite as good as a Q2 bin Cree, and I'm guessing they may also be about as easy to get hold of as a Q3 bin Cree!
