SenzuNite Owl
his eyes dont need to be charged to glow, they just do  
Whoop, there it is!
So it just glows on its own?  That's pretty badass.  I wonder if it is tritium like Comrade guessed.
Does it really look purple/plum, or is it similar to your other skulls that look like black, and purple with certain lighting (sunlight?)?
ps.  if I had that Clack, I'd set him up by my nightstand at night and have him watch over me with evil red eyes as I sleep.