Some of the early K6 (now X5) prototypes had the Astrolux branding on them. The organizers of that group buy were told, or at least told us, that it was placeholder text for testing purposes.
This photo taken from the X6/X5 group buy thread:
Offtopic for this thread, but I wonder if that indicates they already plan to selling that X5 as an Astrolux branded light after the gb…