Lighting device comprising measuring device and method for operating the lighting device

A method for operating a lighting device,

• the lighting device comprising:
• at least one first light source and one second light source, wherein the first light source is designed to emit light having a first spectrum, and wherein the second light source is designed to emit light having a second spectrum, an optical device for combining the light having the first spectrum with the light having the second spectrum onto a common useful light path to form useful light,
• an optical coupling-out element, which is arranged in the common useful light path and is designed for coupling out part of the useful light from the common useful light path onto a measurement light path for use as measurement light,
• a measuring device, which is arranged in the measurement light path and is designed for measuring the measurement light, and
• a control device, which is connected to the measuring device, on the one hand, and to the first light source and the second light source, on the other hand,
• wherein the control device comprises a color management system designed to calculate, from predefined lighting setpoint values for the combined useful light, the requisite setpoint values for the luminous fluxes of the individual light sources and therefrom the requisite setpoint values for the controlled variables of the individual light sources,
• the method comprising:
• in an initialization or change phase:
• predefining lighting setpoint values for the combined useful light, determining the proportional luminous fluxes of the individual light sources for attaining the lighting setpoint values predefined in said predefining lighting setpoint values with the aid of the color management system of the control device, and
• determining the controlled variables for the individual light sources for attaining the proportional luminous fluxes calculated in said determining the proportional luminous fluxes,
• in a regulating phase:
• outputting the controlled variables by means of the control device to the individual light sources,
• measuring the lighting values of the measurement light coupled out with the aid of the optical coupling-out element with the aid of the measuring device,
• determining the lighting actual values of the combined useful light from the measurement values of the measurement light obtained in said measuring the lighting values with the aid of the color management system, and
• determining new controlled variables for the individual light sources if the lighting actual values of the combined useful light determined in said determining the lighting actual values deviate from their setpoint values predefined in said predefining lighting setpoint values, otherwise maintaining the previous controlled variables.