A lighting system comprising a module for transmitting messages in the lighting system, and a plurality of lighting devices (12 1... 12 N); wherein the module comprises: messaging logic (4, 6) configured to generate a message (24 out) for a plurality of destination lighting devices (12 L... 12 U), the message comprising a first portion specifying the plurality of destination lighting devices and a common second portion specifying said message as being of a type that requests a destination lighting device to respond with lighting device information if a predetermined error condition is found at the destination lighting device and not to respond otherwise; and a port configured to broadcast said message to the plurality of destination lighting devices; wherein the messaging logic is configured to receive back via the port, if one of the destination lighting devices (12 n) responds to the message, a response (24 resp) which in addition to identifying the responding one of the destination lighting devices also specifies the requested information of that lighting device; wherein each respective one of the plurality of lighting device (12 n) comprises: a port configured to receive, from the module of a lighting system, the message (24 out) transmitted to the plurality of lighting devices (12 L... 12 U) including said respective one of the plurality of lighting devices; and messaging logic (14, 16) configured to identify said respective one of the plurality of lighting devices as being specified amongst the plurality of lighting devices specified in the first portion, to identify the type of message specified in the second portion, and if required by the identified type of the message and error condition to respond to said module with a response (24 resp) identifying said respective one of the plurality of lighting device and specifying said requested lighting device information.. messaging logic (4, 6) configured to generate a message (24 out) for a plurality of destination lighting devices (12 L... 12 U), the message comprising a first portion specifying the plurality of destination lighting devices and a common second portion specifying said message as being of a type that requests a destination lighting device to respond with lighting device information if a predetermined error condition is found at the destination lighting device and not to respond otherwise; and a port configured to broadcast said message to the plurality of destination lighting devices; wherein the messaging logic is configured to receive back via the port, if one of the destination lighting devices (12 n) responds to the message, a response (24 resp) which in addition to identifying the responding one of the destination lighting devices also specifies the requested information of that lighting device; wherein each respective one of the plurality of lighting device (12 n) comprises: a port configured to receive, from the module of a lighting system, the message (24 out) transmitted to the plurality of lighting devices (12 L... 12 U) including said respective one of the plurality of lighting devices; and messaging logic (14, 16) configured to identify said respective one of the plurality of lighting devices as being specified amongst the plurality of lighting devices specified in the first portion, to identify the type of message specified in the second portion, and if required by the identified type of the message and error condition to respond to said module with a response (24 resp) identifying said respective one of the plurality of lighting device and specifying said requested lighting device information.. a port configured to receive, from the module of a lighting system, the message (24 out) transmitted to the plurality of lighting devices (12 L... 12 U) including said respective one of the plurality of lighting devices; and messaging logic (14, 16) configured to identify said respective one of the plurality of lighting devices as being specified amongst the plurality of lighting devices specified in the first portion, to identify the type of message specified in the second portion, and if required by the identified type of the message and error condition to respond to said module with a response (24 resp) identifying said respective one of the plurality of lighting device and specifying said requested lighting device information..