A two-wire lighting control device comprising: a controllably conductive device adapted to receive an AC line voltage and to supply a phase-control signal to a lighting load in response to a control signal, wherein the controllably conductive device is adapted to be non-conductive for a first duration of time and is adapted to be conductive for a second duration of time such that a first signal is associated with said controllably conductive device, wherein the first signal represents a voltage developed across the controllably conductive device, and wherein the first duration of time and the second duration of time are within a same half-cycle of the AC line voltage; and characterized in that the two-wire lighting control device further comprises: a signal generator adapted to generate a non-zero-magnitude signal; a combiner circuit adapted to generate a combined signal from the first signal and the non-zero-magnitude signal, wherein the combined signal is the first signal during the first duration of time and is the non-zero-magnitude signal during the second duration of time; a low pass filter adapted to filter the combined signal; a control circuit adapted to output said control signal for rendering the controllably conductive device conductive and non-conductive; and a zero-cross detector adapted to receive the filtered combined signal, to detect zero crossings of the filtered combined signal and to provide information indicative of a timing of the zero-crossings of the AC line voltage to the control circuit. a controllably conductive device adapted to receive an AC line voltage and to supply a phase-control signal to a lighting load in response to a control signal, wherein the controllably conductive device is adapted to be non-conductive for a first duration of time and is adapted to be conductive for a second duration of time such that a first signal is associated with said controllably conductive device, wherein the first signal represents a voltage developed across the controllably conductive device, and wherein the first duration of time and the second duration of time are within a same half-cycle of the AC line voltage; and characterized in that the two-wire lighting control device further comprises: a signal generator adapted to generate a non-zero-magnitude signal; a combiner circuit adapted to generate a combined signal from the first signal and the non-zero-magnitude signal, wherein the combined signal is the first signal during the first duration of time and is the non-zero-magnitude signal during the second duration of time; a low pass filter adapted to filter the combined signal; a control circuit adapted to output said control signal for rendering the controllably conductive device conductive and non-conductive; and a zero-cross detector adapted to receive the filtered combined signal, to detect zero crossings of the filtered combined signal and to provide information indicative of a timing of the zero-crossings of the AC line voltage to the control circuit. a signal generator adapted to generate a non-zero-magnitude signal; a combiner circuit adapted to generate a combined signal from the first signal and the non-zero-magnitude signal, wherein the combined signal is the first signal during the first duration of time and is the non-zero-magnitude signal during the second duration of time; a low pass filter adapted to filter the combined signal; a control circuit adapted to output said control signal for rendering the controllably conductive device conductive and non-conductive; and a zero-cross detector adapted to receive the filtered combined signal, to detect zero crossings of the filtered combined signal and to provide information indicative of a timing of the zero-crossings of the AC line voltage to the control circuit.