This illumination system for plant cultivation 9 is configured so that the following modes can be switched: an intermittent illumination mode in which a light source projects light using an illumination cycle such that a light-period range in which lighting is ON for a prescribed time period and a dark-period range in which lighting is OFF for a prescribed time period constitute one cycle； and a continuous illumination mode in which the light source projects light continuously. In addition, this illumination system for plant cultivation 9 is provided with light sources 3, light source driving units 2 for driving the light sources 3, and a control unit 1 that transmits a pulse signal to the light source driving units 2. The control unit 1 includes: a first pulse generating unit 11 that causes a first pulse signal S1 of a prescribed frequency to be generated； a second pulse generating unit 12 that causes a second pulse signal S2 of a frequency different from such prescribed frequency to be generated； and a pulse signal selection unit 13 that selects either the first pulse signal S1 or the second pulse signal S2 and transmits the same to the light source driving units 2. The light source driving units 2 each include the following: a frequency determination unit 21 for determining whether the frequency of the pulse signal received from the control unit 1 is the frequency of the first pulse signal S1 or the second pulse signal S2； a first driving unit 23 that, in a case where the first pulse signal S1 is received from the control unit 1, converts the first pulse signal S1 to constant current output and drives the corresponding light source 3； and second driving units 24, 25 that, in a case where the second pulse signal S2 is received from the control unit 1, output the pulse using the pulse waveform of the second pulse signal S2 as-is, and thereby drive the corresponding light source 3.L'invention concerne un système d'éclairage pour la culture de plantes (9) conçu de te
