A lighting system contains at least one controllable first light (NL), which
is
connected to a first current supply (L, N), and at least one controllable emergency
current light (SL), which is connected to a further emergency current supply (P,
N), separate from the first current supply (L, N). All lights have respective control
devices associated therewith, all control devices being connected to a common bus
(D1, D2). A monitoring device (5) issues a monitoring signal
corresponding to the condition of the first current supply (L, N) onto the bus
(D1, D2), which monitoring signal is evaluated at least by the control
device of the emergency current light (SL) for the recognition of a disruption
and for activation of an emergency current operation.