Solid-State Lighting With Imperceptible Visual Stimuli

A light-emitting diode (LED) luminaire, comprising:

• a first set of LED arrays and a second set of LED arrays, each with a forward voltage;
• at least one power supply unit configured to couple to alternate-current (AC) mains and convert a line voltage from the AC mains into a primary direct-current (DC) voltage greater than the forward voltage;
• and
• a phase-amplitude circuit comprising a control device, a phase retardation circuit, and an LED driving circuit, the control device configured to produce a first set of modulating signal and a second set of modulating signal respectively at a first predetermined temporal modulation frequency and a second predetermined temporal modulation frequency,
• wherein:
• the LED driving circuit comprises at least two modulation circuits configured to produce a first set of driving current and a second set of driving current, respectively, in response to the first set of modulating signal and the second set of modulating signal, to respectively drive the first set of LED arrays and the second set of LED arrays;
• the at least two modulation circuits comprise at least two electronic switches and at least two filter assemblies respectively configured to respond according to the first set of modulating signal and the second set of modulating signal and to suppress interference noises induced by switching the at least two electronic switches, thereby rejecting a frequency pre-mix;
• and
• the phase retardation circuit is configured to retard an operation of the second set of modulating signal in a predetermined phase interval, relative to the first set of modulating signal.