A linear LED lamp for use as an addressable lighting node of a networked LED lighting system, the linear LED lamp comprising an elongate body with a length between a first end and a second end of the elongate body and comprising an elongate heat sink formed of a heat dissipating material; wherein the linear LED lamp further comprises at least one LED emitter panel secured to the elongate heat sink, the at least one LED emitter panel comprising a circuit board containing LED emitters connected in a circuit for emitting and distributing light outwardly from the emitter panel in a light distribution pattern; characterized in that the linear LED lamp further comprises: a network connector configured to connect the linear LED lamp to a network associated with the networked LED lighting system to receive direct current power and data signals according to a standardized network communications protocol from an external device connected to the network for use in powering the LED emitters and controlling one or more operational characteristics of the linear LED lamp; a first end cap assembly at the first end of the elongate body, the first end cap assembly comprising a housing defining a receptacle, an outer wall portion of the first end cap assembly housing defining an opening, the opening allowing a connector associated with a network communications cable to engage and form an electrical connection with the network connector mounted within the receptacle; and a second end cap assembly at the second end of the elongate body. wherein the linear LED lamp further comprises at least one LED emitter panel secured to the elongate heat sink, the at least one LED emitter panel comprising a circuit board containing LED emitters connected in a circuit for emitting and distributing light outwardly from the emitter panel in a light distribution pattern; characterized in that the linear LED lamp further comprises: a network connector configured to connect the linear LED lamp to a network associated with the networked LED lighting system to receive direct current power and data signals according to a standardized network communications protocol from an external device connected to the network for use in powering the LED emitters and controlling one or more operational characteristics of the linear LED lamp; a first end cap assembly at the first end of the elongate body, the first end cap assembly comprising a housing defining a receptacle, an outer wall portion of the first end cap assembly housing defining an opening, the opening allowing a connector associated with a network communications cable to engage and form an electrical connection with the network connector mounted within the receptacle; and a second end cap assembly at the second end of the elongate body. a network connector configured to connect the linear LED lamp to a network associated with the networked LED lighting system to receive direct current power and data signals according to a standardized network communications protocol from an external device connected to the network for use in powering the LED emitters and controlling one or more operational characteristics of the linear LED lamp; a first end cap assembly at the first end of the elongate body, the first end cap assembly comprising a housing defining a receptacle, an outer wall portion of the first end cap assembly housing defining an opening, the opening allowing a connector associated with a network communications cable to engage and form an electrical connection with the network connector mounted within the receptacle; and a second end cap assembly at the second end of the elongate body.