A LED lamp for producing radiated light for health safety and harmonisation of circadian rhythms comprising: at least two LED chains (I, II, III), each LED chain providing a mode of operation of the LED lamp and each comprising a corresponding switch element (Q1-Q3), a power supply source, configure to supply a voltage to each of the LED chains; and characterised in that the LED lamp further comprises a block having: control circuit, a resistor, and a parallel combination of a first capacitor, a second capacitor and a Zener diode, whereby the resistor has a first node for receiving said voltage and a second node connected to said parallel combination of the first capacitor, the second capacitor and the Zener diode such as to produce an operating voltage for the control circuit, wherein the control circuit, by determining the operating voltage, is configured to change said mode of operation by controlling a respective one of said switch elements, wherein said at least two LED chains comprises a first LED chain having at least one LED chip emitting amber light in the wavelength range 580 nm to 610 nm and at least one LED chip emitting red light in the wavelength range 610 nm to 700 nm, and a second LED chain having at least one blue LED chip covered with luminophore emitting continuous band spectrum of visible light with wavelength 440 nm to 700 nm and chromaticity temperature CCT 3800 to 4200 K. at least two LED chains (I, II, III), each LED chain providing a mode of operation of the LED lamp and each comprising a corresponding switch element (Q1-Q3), a power supply source, configure to supply a voltage to each of the LED chains; and characterised in that the LED lamp further comprises a block having: control circuit, a resistor, and a parallel combination of a first capacitor, a second capacitor and a Zener diode, whereby the resistor has a first node for receiving said voltage and a second node connected to said parallel combination of the first capacitor, the second capacitor and the Zener diode such as to produce an operating voltage for the control circuit, wherein the control circuit, by determining the operating voltage, is configured to change said mode of operation by controlling a respective one of said switch elements, wherein said at least two LED chains comprises a first LED chain having at least one LED chip emitting amber light in the wavelength range 580 nm to 610 nm and at least one LED chip emitting red light in the wavelength range 610 nm to 700 nm, and a second LED chain having at least one blue LED chip covered with luminophore emitting continuous band spectrum of visible light with wavelength 440 nm to 700 nm and chromaticity temperature CCT 3800 to 4200 K. control circuit, a resistor, and a parallel combination of a first capacitor, a second capacitor and a Zener diode, whereby the resistor has a first node for receiving said voltage and a second node connected to said parallel combination of the first capacitor, the second capacitor and the Zener diode such as to produce an operating voltage for the control circuit, wherein the control circuit, by determining the operating voltage, is configured to change said mode of operation by controlling a respective one of said switch elements, wherein said at least two LED chains comprises a first LED chain having at least one LED chip emitting amber light in the wavelength range 580 nm to 610 nm and at least one LED chip emitting red light in the wavelength range 610 nm to 700 nm, and a second LED chain having at least one blue LED chip covered with luminophore emitting continuous band spectrum of visible light with wavelength 440 nm to 700 nm and chromaticity temperature CCT 3800 to 4200 K.