Abstract: Horticultural lighting system comprising a first string (22) of at least one light element (16, 40), a second string (24) of at least one light element (16, 40), both strings being electrically connected in parallel with each other, a power supply unit (12, 50, 60, 70) providing an AC current/voltage to the parallel circuit of the strings, and means for energizing (26, 42) the first string during a first half period of the AC voltage and the second string during a second half period of the AC voltage, so that each string radiates pulsed light, said first string and said second string being arranged such that different areas (32, 34) are irradiated. The lighting system is also to be used in an environment where living organisms are irradiated with light, or a greenhouse for exposing plants to pulsed light. A corresponding method is also claimed.

Abstract: In supply circuits (6) comprising bridge circuits (2) and resonance circuits (3) with primary parts to be coupled to the bridge circuits (2) and secondary parts to be coupled to load circuits (4), the secondary parts are provided with elements (32-34) defining resonance frequencies and resonance impedances, to be able to supply different load circuits (4) and/or different loads (41-42) per load circuit (4) individually. The elements (32-34) may comprise capacitors (34) and inductors (32-33). The resonance frequencies define features of primary signals to be supplied from the bridge circuits (2) to the resonance circuits (3) such as pulse widths of pulses of voltage signals and/or pulse frequencies of the voltage signals. The resonance impedances define features of secondary signals to be supplied from the resonance circuits (3) to the load circuits (4) such as values or average values of current signals.