US Patent 10257902 Sleepy light

The invention provides a lighting device (100) comprising a first light source (10) and a second light source (20), a control system (50) configured to control the first light source (10) and the second light source (20), wherein the first light source (10) is configured to provide first light source light (11) having a correlated color temperature (CCT) of at maximum 3000 K and a color rendering index (CRI) of at least 75, and wherein the second light source (20) is configured to provide second light source light (21) having a dominant wavelength selected from the range of (575-780) nm and having a color rendering index of at maximum (70).