Solid-state circadian rhythm lamp and luminaire and related control techniques

A solid-state luminaire comprising:

• a printed circuit board (PCB);
• a first plurality of solid-state emitters populated over the PCB and configured to emit light having a first correlated color temperature (CCT);
• a second plurality of solid-state emitters populated over the PCB and configured to emit light having a second CCT that differs from the first CCT;
• and
• a controller configured to:
• electronically control, via a control signal, emissions of the first plurality of solid-state emitters and the second plurality of solid-state emitters such that:
• in a first emissions mode, the first plurality of solid-state emitters emits light, wherein a spectral power ratio of the light emitted at a wavelength in the range of about 400-495 nm to a remainder of the light emitted by the first plurality of solid-state emitters in the first emissions mode is such that the light emitted at the wavelength in the range of about 400-495 nm constitutes about 10% or less of a total light emitted by the first plurality of solid-state emitters;
• and
• in a second emissions mode, the second plurality of solid-state emitters emits light, wherein a spectral power ratio of the light emitted at a wavelength in the range of about 400-495 nm to a remainder of the light emitted by the second plurality of solid-state emitters in the second emissions mode is such that the light emitted at the wavelength in the range of about 400-495 nm constitutes about 30% or more of a total light emitted by the second plurality of solid-state emitters;
• and
• provide for changing between the first emissions mode and the second emissions mode based on hysteresis of a lighting switch associated with the solid-state luminaire.