A method for configuring and selecting a LED lighting appliance based on the assessment of a plurality of design parameters, comprising the following steps: aa) providing a database comprising information related to: a plurality of lighting appliances, each identified by a product code (cod), a plurality of optics, a plurality of LEDs and a plurality of electronic drivers and controlling devices of said LEDs; bb) acquiring from a user a number of design requirements selected from a group comprising the type of lighting appliance to be used, the type of optic to be used, the color temperature of the light emission, the required value (Fric, 16) of the light flux (Fp) of the lighting appliance, the ambient operating temperature (Tamb, 18), the system duration (t, 20), the daily operating hours, the available mains voltage, the driving or dimming profile to be applied to the LEDs of the lighting appliance during the daily operation hours, the selection criterion to be applied, in turn selected from a group comprising the lowest installation cost, the highest efficiency and the lowest total operating cost after a given period; cc) setting an initial starting point by choosing an initial product code (cod) and an initial supply current value of said LEDs, and initial values for said light flux (Fp) of the appliance and of said system duration (t); dd) iterating at least one of the values of said product code (cod), said system duration (t) and said supply current of said LEDs by setting said product code (cod) equal to the next product code in said database, setting said system duration (t) equal to the present value increased by one, setting said supply current of said LEDs equal to the current value multiplied by the ratio between the required value (Fric) and the current value of the light flux (Fp); ee) calculating the junction temperature value of said LEDs (T, 27), the value of the produced light flux (Fp, 29), the value of the electrical power drawn by said lighting appliance, the value of the average lifespan of said electronic devices in the present operating conditions; ff) comparing the supply current values, the junction temperature values of said LEDs, the produced light flux value (Fp), the electrical power value drawn by said lighting appliance, the average lifespan value of said electronic devices and the system duration (t) against said design requirements to check whether said design requirements are met; gg) in case said design requirements are not met then iterate one more time starting from preceding step dd), otherwise select the lighting appliance corresponding to the current product code (cod). aa) providing a database comprising information related to: a plurality of lighting appliances, each identified by a product code (cod), a plurality of optics, a plurality of LEDs and a plurality of electronic drivers and controlling devices of said LEDs; bb) acquiring from a user a number of design requirements selected from a group comprising the type of lighting appliance to be used, the type of optic to be used, the color temperature of the light emission, the required value (Fric, 16) of the light flux (Fp) of the lighting appliance, the ambient operating temperature (Tamb, 18), the system duration (t, 20), the daily operating hours, the available mains voltage, the driving or dimming profile to be applied to the LEDs of the lighting appliance during the daily operation hours, the selection criterion to be applied, in turn selected from a group comprising the lowest installation cost, the highest efficiency and the lowest total operating cost after a given period; cc) setting an initial starting point by choosing an initial product code (cod) and an initial supply current value of said LEDs, and initial values for said light flux (Fp) of the appliance and of said system duration (t); dd) iterating at least one of the values of said product code (cod), said system duration (t) and said supply current of said LEDs by setting said product code (cod) equal to the next product code in said database, setting said system duration (t) equal to the present value increased by one, setting said supply current of said LEDs equal to the current value multiplied by the ratio between the required value (Fric) and the current value of the light flux (Fp); ee) calculating the junction temperature value of said LEDs (T, 27), the value of the produced light flux (Fp, 29), the value of the electrical power drawn by said lighting appliance, the value of the average lifespan of said electronic devices in the present operating conditions; ff) comparing the supply current values, the junction temperature values of said LEDs, the produced light flux value (Fp), the electrical power value drawn by said lighting appliance, the average lifespan value of said electronic devices and the system duration (t) against said design requirements to check whether said design requirements are met; gg) in case said design requirements are not met then iterate one more time starting from preceding step dd), otherwise select the lighting appliance corresponding to the current product code (cod).