The following is based on Project V13 promotional material and is not canon.
“Extreme radiation exposure has left you glowing in the dark! Darkness is no obstacle to you or your enemies. You gain resistance to radiation but you irradiate those around you.”— Fallout Tactics description
Glowing One is a trait in Fallout Tactics, available only to ghouls. It was also supposed to appear in the canceled Fallout MMO developed by Interplay, Project V13.