Method for operating an arrangement designed to emit light that can be adjusted in brightness or colour coordinate, which has at least two electrically controllable LED light sources (4, 5, 6) that differ in a dominant wavelength of the light they generate, wherein the light emitted by the arrangement is generated by additive mixing of the light generated by each LED light source (4, 5, 6), the LED light sources (4, 5, 6) being supplied individually in such a way that a predefined dominant wavelength of the light emitted by the arrangement is constant regardless of the respective brightness of the light emitted by the arrangement, or that a predefined brightness of the light emitted by the arrangement is constant regardless of the respective dominant wavelength of the light emitted by the arrangement, characterized in that the predefined dominant wavelength of the light emitted by the arrangement or the predefined brightness of the light emitted by the arrangement is set by a control system without a closed feedback loop, by the at least two LED light sources (4, 5, 6) each being supplied with an individual DC supply current, taking into account at least one characteristic curve or at least one characteristic curve family, wherein each at least one characteristic curve or each at least one characteristic curve family reproduces a predefined dependency of the dominant wavelength of the light generated by that LED light source (4, 5, 6) on a current strength of an individual DC supply current supplying that LED light source (4, 5, 6), wherein in each case a temperature of the at least two LED light sources (4, 5, 6) or a temperature of the arrangement is detected and the at least two LED light sources (4, 5, 6) are each supplied with the respective individual DC supply current, taking into account a predefined dependence of the dominant wavelength of the light generated by the respective LED light source (4, 5, 6) on the temperature of that LED light source (4, 5, 6) or taking into account a predefined dependence of the dominant wavelength of the light emitted by the arrangement on a temperature of the arrangement, for which purpose one of the at least one characteristic curves is used that reflects the dependence of the dominant wavelength of the light generated by that LED light source (4, 5, 6) on the temperature of the respective LED light source (4, 5, 6) or the dependence of the dominant wavelength of the light generated by that LED light source (4, 5, 6) on the temperature of the arrangement, wherein in each case during the operation of the arrangement the one of the at least one characteristic curves is used to compensate for a temperature-dependent change in the dominant wavelength of the light generated by the respective LED light source (4, 5, 6). characterized in that the predefined dominant wavelength of the light emitted by the arrangement or the predefined brightness of the light emitted by the arrangement is set by a control system without a closed feedback loop, by the at least two LED light sources (4, 5, 6) each being supplied with an individual DC supply current, taking into account at least one characteristic curve or at least one characteristic curve family, wherein each at least one characteristic curve or each at least one characteristic curve family reproduces a predefined dependency of the dominant wavelength of the light generated by that LED light source (4, 5, 6) on a current strength of an individual DC supply current supplying that LED light source (4, 5, 6), wherein in each case a temperature of the at least two LED light sources (4, 5, 6) or a temperature of the arrangement is detected and the at least two LED light sources (4, 5, 6) are each supplied with the respective individual DC supply current, taking into account a predefined dependence of the dominant wavelength of the light generated by the respective LED light source (4, 5, 6) on the temperature of that LED light source (4, 5, 6) or taking into account a predefined dependence of the dominant wavelength of the light emitted by the arrangement on a temperature of the arrangement, for which purpose one of the at least one characteristic curves is used that reflects the dependence of the dominant wavelength of the light generated by that LED light source (4, 5, 6) on the temperature of the respective LED light source (4, 5, 6) or the dependence of the dominant wavelength of the light generated by that LED light source (4, 5, 6) on the temperature of the arrangement, wherein in each case during the operation of the arrangement the one of the at least one characteristic curves is used to compensate for a temperature-dependent change in the dominant wavelength of the light generated by the respective LED light source (4, 5, 6).