A system comprising: a plurality of lighting fixtures; and a handheld device comprising: • a user interface (94, 96); • a communications interface (100,102); and • a central processing unit associated with the user interface and the communications interface characterized in that the central processing unit is adapted to: • provide an instruction to a lighting fixture of the plurality of lighting fixtures to enter a lightcast mode; • receive grouping data for the plurality of lighting fixtures (10,130), wherein the grouping data is generated by at least one lighting fixture independently of the plurality of lighting fixtures in response to the instructions sent to the lighting fixture of the plurality of lighting fixtures to enter the lightcast mode from the central processing unit; • assign each of the plurality of lighting fixtures to one of at least two groups based on the received grouping data; and • send an instruction identifying the one of the at least two groups to which the at least one lighting fixture belongs. a plurality of lighting fixtures; and a handheld device comprising: • a user interface (94, 96); • a communications interface (100,102); and • a central processing unit associated with the user interface and the communications interface characterized in that the central processing unit is adapted to: • provide an instruction to a lighting fixture of the plurality of lighting fixtures to enter a lightcast mode; • receive grouping data for the plurality of lighting fixtures (10,130), wherein the grouping data is generated by at least one lighting fixture independently of the plurality of lighting fixtures in response to the instructions sent to the lighting fixture of the plurality of lighting fixtures to enter the lightcast mode from the central processing unit; • assign each of the plurality of lighting fixtures to one of at least two groups based on the received grouping data; and • send an instruction identifying the one of the at least two groups to which the at least one lighting fixture belongs. • a user interface (94, 96); • a communications interface (100,102); and • a central processing unit associated with the user interface and the communications interface characterized in that the central processing unit is adapted to: • provide an instruction to a lighting fixture of the plurality of lighting fixtures to enter a lightcast mode; • receive grouping data for the plurality of lighting fixtures (10,130), wherein the grouping data is generated by at least one lighting fixture independently of the plurality of lighting fixtures in response to the instructions sent to the lighting fixture of the plurality of lighting fixtures to enter the lightcast mode from the central processing unit; • assign each of the plurality of lighting fixtures to one of at least two groups based on the received grouping data; and • send an instruction identifying the one of the at least two groups to which the at least one lighting fixture belongs. • provide an instruction to a lighting fixture of the plurality of lighting fixtures to enter a lightcast mode; • receive grouping data for the plurality of lighting fixtures (10,130), wherein the grouping data is generated by at least one lighting fixture independently of the plurality of lighting fixtures in response to the instructions sent to the lighting fixture of the plurality of lighting fixtures to enter the lightcast mode from the central processing unit; • assign each of the plurality of lighting fixtures to one of at least two groups based on the received grouping data; and • send an instruction identifying the one of the at least two groups to which the at least one lighting fixture belongs.