  Bolometers have proven to be very good detectors to search for rare processes
thanks to their excellent energy resolution and their low intrinsic background.
Further active background rejection can be obtained by the simultaneous readout
of the heat and light signals produced by particles interacting in
scintillating bolometers, as proposed by the LUCIFER experiment. In this
framework, the choice of the light detector and the optimization of its working
conditions play a crucial role. In this paper, we report a study of the
performances of a Germanium bolometric light detector in terms of signal
amplitude, energy resolution and signal time development. The impact of various
operational parameters on the detector performances is discussed.
