An apparatus providing a regenerative light source capable of illuminating a large area in front of and around the barrel end of a firearm. A plasma oxidation treatment is provided to form a silicon oxide coating over the spacer layer, wherein the silicon oxide coating provides a horizontal coating on the horizontal surfaces and sidewall coatings on the sidewall surfaces of the spacer layer. The first wall is protected from hot flowpath gases by the outer wall and by cooling air flowing through the channels. If it is determined that the transition point occurs within the plurality of samples, a state machine comprising a plurality of states transitions from a first state to a second state. The second signal pin has a second terminal, which is disposed between the first edge and the first terminal. A command to send an email message is received.