Smart portable lighting device comprising: - at least one artificial light source with a high light power, or several artificial light sources (1A, 1B,...) with a high light power, wherein said artificial light source or each of these artificial light sources (1A, 1B,...) is/are equipped with a voltage/current electrical power converter (C1A, C1B,...) which is able to regulate the power of said light sources in accordance with a given set point, - an independent electrical power source formed of at least one rechargeable battery to supply the artificial light source(s) by means of voltage/current electrical power converters, - an electronic control box comprising at least one digital processing unit linked to auxiliary circuits and connected, on the one hand, to the independent electrical power source and, on the other hand, to the converter(s) (C1A, C1B,...) of the artificial light source(s) (1A, 1B,...), wherein said electronic control box is configured to communicate with the independent power source to obtain information about the instantaneous residual capacity of this or to measure the voltage or current characteristics of said independent power source to determine the instantaneous residual energy of this; characterised in that said electronic control box is configured: - to determine a main illumination set point having a constant illumination power from programming a desired lighting period, or to determine a lighting period set point from programming a desired constant illumination power; and - to readjust the main programmed illumination set point at any time, as soon as the user changes an illumination period or illumination power set point during the main illumination phase, in order to establish: o a new lighting power set point transmitted to the voltage/current electrical power converter(s) (C1A, C1B,...) depending on the residual energy of the independent electrical power source and the main programmed illumination period, as soon as the user changes the illumination period set point; or o a new illumination period, depending on the residual energy of the independent electrical power source and the desired illumination power, as soon as the user changes an illumination power set point. - at least one artificial light source with a high light power, or several artificial light sources (1A, 1B,...) with a high light power, wherein said artificial light source or each of these artificial light sources (1A, 1B,...) is/are equipped with a voltage/current electrical power converter (C1A, C1B,...) which is able to regulate the power of said light sources in accordance with a given set point, - an independent electrical power source formed of at least one rechargeable battery to supply the artificial light source(s) by means of voltage/current electrical power converters, - an electronic control box comprising at least one digital processing unit linked to auxiliary circuits and connected, on the one hand, to the independent electrical power source and, on the other hand, to the converter(s) (C1A, C1B,...) of the artificial light source(s) (1A, 1B,...), wherein said electronic control box is configured to communicate with the independent power source to obtain information about the instantaneous residual capacity of this or to measure the voltage or current characteristics of said independent power source to determine the instantaneous residual energy of this; - to determine a main illumination set point having a constant illumination power from programming a desired lighting period, or to determine a lighting period set point from programming a desired constant illumination power; and - to readjust the main programmed illumination set point at any time, as soon as the user changes an illumination period or illumination power set point during the main illumination phase, in order to establish: o a new lighting power set point transmitted to the voltage/current electrical power converter(s) (C1A, C1B,...) depending on the residual energy of the independent electrical power source and the main programmed illumination period, as soon as the user changes the illumination period set point; or o a new illumination period, depending on the residual energy of the independent electrical power source and the desired illumination power, as soon as the user changes an illumination power set point. o a new lighting power set point transmitted to the voltage/current electrical power converter(s) (C1A, C1B,...) depending on the residual energy of the independent electrical power source and the main programmed illumination period, as soon as the user changes the illumination period set point; or o a new illumination period, depending on the residual energy of the independent electrical power source and the desired illumination power, as soon as the user changes an illumination power set point.