Abstract: A lamp having a first light source for producing a light having a spectral distribution, wherein the light is represented by a set of chromaticity coordinates in a chromaticity diagram, and having a second light source for producing a second light having a second spectral distribution, wherein the second light is represented by a second set of coordinates in the chromaticity diagram, the second spectral distribution being different from the first spectral distribution. Furthermore, the lamp has a control unit for controlling the light sources, which control unit is designed so that an intensity of the first light can be changed independently of an intensity of the second light. By changing the intensities of the lights, the weighting of the lights can be changed so that the melanopic effect factor of the light emitted by the lamp is thereby changed without the color temperature of the light changing.

Abstract: A lamp having a first light source for producing a light having a spectral distribution, wherein the light is represented by a set of chromaticity coordinates in a chromaticity diagram, and having a second light source for producing a second light having a second spectral distribution, wherein the second light is represented by a second set of coordinates in the chromaticity diagram, the second spectral distribution being different from the first spectral distribution. Furthermore, the lamp has a control unit for controlling the light sources, which control unit is designed so that an intensity of the first light can be changed independently of an intensity of the second light. By changing the intensities of the lights, the weighting of the lights can be changed so that the melanopic effect factor of the light emitted by the lamp is thereby changed without the color temperature of the light changing.