Doh! Found it in the CK ...
It has a script attached to it that is supposed to give you "Glow Dust". Now, why don't they just drop glow dust?

Scriptname wispCoreScript extends ObjectReference
ingredient property glowDust auto
EVENT onActivate(objectReference actronaut)
int num = utility.randomInt(1,3)
(actronaut as actor).addItem(glowDust,num)
disable()
delete()
endEVENT