Hello Lux-Perpetua,
Please, let me reference this review, which maukka did. Based on this, LH351C could be perfect, where total power is of smaller priority (e.g. headlamps). His graph suggest, that the sweet spot with this emitter is at 3.0-3.3A, producing 950-1000lm (and all of this at CRI 90), which is plenty enough, if we think about the current use case (just be sure to get the highest possible performance bin, as maukka did).
I think, it should be relatively easily sourced, because Wurkkos has already access to LH351D.
Also, XPL-HI has higher Vf than LH351C, which means, maximum output will decrease relatively early, while draining the battery (but the difference is not that big).
And please, read this, which is a comment by maukka about beam and optics.
So, this emitter could open up some possibilities with small to mid sized throwy flashlights/headlamps (5000K and 5700K options to cover the range, which is not covered by SST-20 high CRI)
+1: LH351C is completely bargain priced compared to XP-L HI
On the other side, it is still not really throwy, but much better than LH351D in this regard.