A receiving device (12) for receiving an optical communication signal, wherein the optical communication signal comprises an encoded or modulated signal, the device comprising: one or more photodetectors (12) configured to produce photodetector signals in response to detecting photons; one or more further photodetectors (14) configured to produce further photodetector signals; a controller (16) configured to select an operational mode of the receiving device in dependence on at least a light level, wherein the operational mode is one of at least a first mode in which a demodulation or decoding process is performed on the photodetector signals and a second mode in which the demodulation or decoding process is performed on the further photodetector signals, and a photon count limiter (18) associated with the one or more photodetector for controlled limiting of the photon count of the one or more photodetectors in dependence on at least a light level.