A signal-preserving power booster and a related method. An input module, comprises a reference port and two input ports, receives an input light signal, which conveys an input lighting power component at a first power level and a data-over-light digital stream component imperceptible to a human eye. A MOSFET amplifier module, having access to the reference port, provides an output light signal between two output ports, a first output port being connected to an internal amplifier circuit connected to the first input port and a second output port being connected to the second input port. The output light signal conveys the data-over-light digital stream component from the input light signal and an output lighting power component, at a second power level equal to or greater than the first power level, the output light signal powering an array of LEDs at the second power level.