A method of transmitting a first data packet and a second data packet to a lighting fixture network via manipulation of a transformer including a primary winding and a secondary winding, the method comprising: - receiving data indicative of appropriate lighting fixture settings for one or more lighting fixtures of the lighting fixture network; - determining the first data packet based on said data; - coupling the primary winding in series with a line of a mains power supply, wherein the mains power supply is adapted to provide an input voltage; - providing an output voltage to said lighting fixtures via the transformer; - providing at least one switch (125a, 125b) at the secondary winding; - selectively activating the at least one switch (125a, 125b) during certain positive half-sine cycles of a first sequence of sine cycles of said input voltage to cause at least one of a voltage drop and a voltage rise of the output voltage during said certain positive half-sine cycles and not activating the at least one switch (125a, 125b) during the rest of half-sine cycles of the first sequence of sine cycles of said input voltage, wherein said selectively activating is done in correspondence with said first data packet; characterized in that the method further comprises: - determining a second data packet based on said data and selectively activating the at least one switch (125a, 125b) during certain negative half-sine cycles of a second sequence of sine cycles of said input voltage to cause at least one of a voltage drop and a voltage rise of the output voltage during said certain negative half-sine cycles and not activating the at least one switch (125a, 125b) during the rest of half-sine cycles of the second sequence of sine cycles of said input voltage, wherein said selectively activating is done in correspondence with said second data packet. - receiving data indicative of appropriate lighting fixture settings for one or more lighting fixtures of the lighting fixture network; - determining the first data packet based on said data; - coupling the primary winding in series with a line of a mains power supply, wherein the mains power supply is adapted to provide an input voltage; - providing an output voltage to said lighting fixtures via the transformer; - providing at least one switch (125a, 125b) at the secondary winding; - selectively activating the at least one switch (125a, 125b) during certain positive half-sine cycles of a first sequence of sine cycles of said input voltage to cause at least one of a voltage drop and a voltage rise of the output voltage during said certain positive half-sine cycles and not activating the at least one switch (125a, 125b) during the rest of half-sine cycles of the first sequence of sine cycles of said input voltage, wherein said selectively activating is done in correspondence with said first data packet; - determining a second data packet based on said data and selectively activating the at least one switch (125a, 125b) during certain negative half-sine cycles of a second sequence of sine cycles of said input voltage to cause at least one of a voltage drop and a voltage rise of the output voltage during said certain negative half-sine cycles and not activating the at least one switch (125a, 125b) during the rest of half-sine cycles of the second sequence of sine cycles of said input voltage, wherein said selectively activating is done in correspondence with said second data packet.