According to some embodiments, an electrical connector may comprise a first end and a second end, wherein the electrical connector defines a channel. A valve seat is disposed upstream of the discharge orifices and has a cylindrical fuel passage formed therein. The system includes transmission-based sensors alone and in combination with reflective-based sensors. The at least one lens has a surface area such that light emitted by the at least one light emitting element is directed into a spatial volume proximate the electrical wiring device. The heating is carried out at a seeding temperature, followed by a growth temperature that is higher than the seeding temperature.