A lighting circuit comprising - a primary set (11, 13) of light-emitting diodes (110, 130) of a first color, - a secondary set of light-emitting diodes of a further color; wherein a temperature-dependent reduction in light output of the primary set (11, 13) of light-emitting diodes (110, 130) is greater than a temperature-dependent reduction in light output of the secondary set of light-emitting diodes; and - a flux ratio fixing arrangement to maintain a substantially constant ratio between the light output of the primary set (11, 13) and the light output of the secondary set during a temperature-dependent overall reduction in light output of the light-emitting diodes (110, 120, 130) of the lighting circuit wherein - the flux ratio fixing arrangement is designed to decrease the current through the light-emitting diodes of the secondary set on the basis of a drop in forward voltage over the light-emitting diodes (110, 130) of the primary set (11, 13) or the flux ratio fixing arrangement is designed to increases the current through the light-emitting diodes (110, 130) of the primary set (11, 13) on basis of a drop in the forward voltage over the light emitting diodes of the secondary set; - the flux ratio fixing arrangement comprises: a first current source in series with the primary set, for supplying a current to the primary set; a second current source in series with the secondary set, for supplying a current to the secondary set; a DC constant voltage supply parallel across the series connection of the primary set and the first current source, and parallel across the series connection of the secondary set and the second current source; and a compensation resistor (R COMP, R COMP_13) connected to the primary set (11, 13) of light-emitting diodes (110, 130), wherein the resistance of the compensation resistor (R COMP, R COMP_13) is constant and chosen on the basis of the difference between the temperature-dependent reduction in light output of the primary set (11, 13) of light-emitting diodes (110, 130) and the temperature-dependent reduction in light output of the secondary set of light-emitting diodes. - a primary set (11, 13) of light-emitting diodes (110, 130) of a first color, - a secondary set of light-emitting diodes of a further color; wherein a temperature-dependent reduction in light output of the primary set (11, 13) of light-emitting diodes (110, 130) is greater than a temperature-dependent reduction in light output of the secondary set of light-emitting diodes; and - a flux ratio fixing arrangement to maintain a substantially constant ratio between the light output of the primary set (11, 13) and the light output of the secondary set during a temperature-dependent overall reduction in light output of the light-emitting diodes (110, 120, 130) of the lighting circuit - the flux ratio fixing arrangement is designed to decrease the current through the light-emitting diodes of the secondary set on the basis of a drop in forward voltage over the light-emitting diodes (110, 130) of the primary set (11, 13) or the flux ratio fixing arrangement is designed to increases the current through the light-emitting diodes (110, 130) of the primary set (11, 13) on basis of a drop in the forward voltage over the light emitting diodes of the secondary set; - the flux ratio fixing arrangement comprises: a first current source in series with the primary set, for supplying a current to the primary set; a second current source in series with the secondary set, for supplying a current to the secondary set; a DC constant voltage supply parallel across the series connection of the primary set and the first current source, and parallel across the series connection of the secondary set and the second current source; and a compensation resistor (R COMP, R COMP_13) connected to the primary set (11, 13) of light-emitting diodes (110, 130), wherein the resistance of the compensation resistor (R COMP, R COMP_13) is constant and chosen on the basis of the difference between the temperature-dependent reduction in light output of the primary set (11, 13) of light-emitting diodes (110, 130) and the temperature-dependent reduction in light output of the secondary set of light-emitting diodes. a first current source in series with the primary set, for supplying a current to the primary set; a second current source in series with the secondary set, for supplying a current to the secondary set; a DC constant voltage supply parallel across the series connection of the primary set and the first current source, and parallel across the series connection of the secondary set and the second current source; and a compensation resistor (R COMP, R COMP_13) connected to the primary set (11, 13) of light-emitting diodes (110, 130), wherein the resistance of the compensation resistor (R COMP, R COMP_13) is constant and chosen on the basis of the difference between the temperature-dependent reduction in light output of the primary set (11, 13) of light-emitting diodes (110, 130) and the temperature-dependent reduction in light output of the secondary set of light-emitting diodes.