Stacked camera sensors have been a thing for a while now; they have improved sensitivity to light by stacking translucent photodiodes on top of each other.
The Nichia 719A is the inverse; translucent LEDs are stacked on top of each other (in a single package) for increased intensity.
“Estimated ship date: mid July”
Do you know the timetable for Simon getting 719As in his lights? Last I heard it was supposed to be ~May-June. He might beat zebralight to the punch with the first 719A light.