Abstract: The invention provides a light indicator (100) for use in evaluating melanopsin active radiation in a flux of light, the light indicator (100) comprising a first light indicator element (110) comprising a first light reflective element (112) and a second light indicator element (120) comprising a second light reflective element (122), the light reflecting elements (112,122) having different wavelength dependencies of the spectral reflectivity, wherein the light reflecting elements (112,122) are selected to provide the same intensity of reflected light of two or more different types of light irradiating on the light indicator elements (110,120), wherein the two or more different types of light have different spectral power distributions in the visible wavelength range but having the same ratios of the melanopic flux and the luminous flux, wherein the ratio of the melanopic flux and the luminous flux of light is defined as MEF = 1.

Abstract: The invention provides a lighting system (1000) comprising:—a lighting device (100) configured to provide light (101);—a sensor (150) configured to sense a user-related parameter selected from one or more of (a) a distance parameter (d) between the lighting device (100) and a user (1) and (b) an eye-activity parameter of the eye (2) of the user (1); and—a control system (200) is configured to control one or more lighting properties selected from a spectral power distribution of the light (101) and a light intensity I of the light (101) as function of the user-related parameter.

Abstract: The invention provides a light indicator (100) for use in evaluating melanopsin active radiation in a flux of light, the light indicator (100) comprising a first light indicator element (110) comprising a first light reflective element (112) and a second light indicator element (120) comprising a second light reflective element (122), the light reflecting elements (112, 122) having different wavelength dependencies of the spectral reflectivity, wherein the light reflecting elements (112, 122) are selected to provide the same intensity of reflected light of two or more different types of light irradiating on the light indicator elements (110, 120), wherein the two or more different types of light have different spectral power distributions in the visible wavelength range but having the same ratios of the melanopic flux and the luminous flux, wherein the ratio of the melanopic flux and the luminous flux of light is defined as Formula (I) wherein SPD(?) is the spectral power distribution of the light, m(?) is th

Abstract: The invention provides a lighting system (1000) comprising:—a lighting device (100) configured to provide light (101);—a sensor (150) configured to sense a user-related parameter selected from one or more of (a) a distance parameter (d) between the lighting device (100) and a user (1) and (b) an eye-activity parameter of the eye (2) of the user (1); and—a control system (200) is configured to control one or more lighting properties selected from a spectral power distribution of the light (101) and a light intensity I of the light (101) as function of the user-related parameter.