An operating apparatus arranged to operate one or more lighting devices, wherein the operating apparatus comprises: - a converter comprising a transformer comprising a primary side and a secondary side, wherein electrical energy is transferred from the primary side to the secondary side of the transformer for operating the one or more lighting devices; - a charger comprising an energy storage device, wherein the charger is arranged on the secondary side of the transformer, connected to the secondary winding of the transformer and is configured to charge the energy storage device with the electrical energy, transferred from the primary side to the secondary side of the transformer; - a lighting device driver (122, 123, 124, 125) arranged on the secondary side of the transformer and configured to deliver to the one or more lighting devices the electrical energy, transferred from the primary side to the secondary side of the transformer, wherein: - the primary side of the transformer comprises a primary winding and the secondary side of the transformer comprises at least one secondary winding; and - the charger and the lighting device driver (122, 123, 124, 125) are connected to the at least one secondary winding of the transformer, - wherein the charger comprises a charger switch configured to switch on or off the transfer of the electrical energy to the charger and - wherein the lighting device driver (122, 123, 124, 125) comprises: - a switch or diode connecting the secondary winding with a capacitor, - a main capacitor, which is configured to transfer electrical energy to the one or more lighting devices when the electrical energy flows through the primary side of the transformer and is stored in the transformer; and - a main capacitor isolating switch, which is configured to isolate the main capacitor from the capacitor when the charger charges the energy storage device with the electrical energy, transferred from the primary side to the secondary side of the transformer. - a converter comprising a transformer comprising a primary side and a secondary side, wherein electrical energy is transferred from the primary side to the secondary side of the transformer for operating the one or more lighting devices; - a charger comprising an energy storage device, wherein the charger is arranged on the secondary side of the transformer, connected to the secondary winding of the transformer and is configured to charge the energy storage device with the electrical energy, transferred from the primary side to the secondary side of the transformer; - a lighting device driver (122, 123, 124, 125) arranged on the secondary side of the transformer and configured to deliver to the one or more lighting devices the electrical energy, transferred from the primary side to the secondary side of the transformer, wherein: - the primary side of the transformer comprises a primary winding and the secondary side of the transformer comprises at least one secondary winding; and - the charger and the lighting device driver (122, 123, 124, 125) are connected to the at least one secondary winding of the transformer, - wherein the charger comprises a charger switch configured to switch on or off the transfer of the electrical energy to the charger and - wherein the lighting device driver (122, 123, 124, 125) comprises: - a switch or diode connecting the secondary winding with a capacitor, - a main capacitor, which is configured to transfer electrical energy to the one or more lighting devices when the electrical energy flows through the primary side of the transformer and is stored in the transformer; and - a main capacitor isolating switch, which is configured to isolate the main capacitor from the capacitor when the charger charges the energy storage device with the electrical energy, transferred from the primary side to the secondary side of the transformer. - a switch or diode connecting the secondary winding with a capacitor, - a main capacitor, which is configured to transfer electrical energy to the one or more lighting devices when the electrical energy flows through the primary side of the transformer and is stored in the transformer; and - a main capacitor isolating switch, which is configured to isolate the main capacitor from the capacitor when the charger charges the energy storage device with the electrical energy, transferred from the primary side to the secondary side of the transformer.