1. A system comprising a data network of luminaires including a first luminaire, the first luminaire comprising:a first receiver configured to receive wirelessly a first message from a second luminaire, wherein the first message comprises a first source address, a first propagation range, a first hop count, and a first light level;
a first lamp configured to provide light at a first light output;
a first controller configured to modify the first light output based on:
i) the first light level,
ii) the first hop count,
iii) the first propagation range, and
iv) whether or not the first source address is a member of a first non-empty set of neighbor addresses; and
a first transmitter configured to transmit wirelessly a second message, wherein the first transmitter of the first luminaire decides whether or not to transmit the second message based on i) the first hop count and ii) the first propagation range.