A system comprising: a plurality of light-emitter devices partitioned into a plurality of groups , wherein each light-emitter device is associated with a given group of the plurality of groups, wherein each group comprises light-emitter devices disposed within a respective contiguous region; and a controller , wherein the controller carries out operations, the operations comprising: causing each of the plurality of light-emitter devices to emit an impulse, wherein the impulse comprises at least one light pulse, wherein the plurality of the impulses is emitted from the plurality of light-emitter devices based on a firing order, characterized in that between temporally-adjacent impulses emitted from light-emitter devices in a given group, an impulse from a light-emitter device in at least one other group is timed to occur, wherein between temporally-adjacent impulses emitted from a given light-emitter device, an impulse from at least one other light-emitter device in the same group is timed to occur, wherein the plurality of impulses is emitted among the plurality of groups based on a predetermined group order, and wherein the predetermined group order is configured so as to temporally separate light pulses emitted by spatially adjacent groups. a plurality of light-emitter devices partitioned into a plurality of groups , wherein each light-emitter device is associated with a given group of the plurality of groups, wherein each group comprises light-emitter devices disposed within a respective contiguous region; and a controller , wherein the controller carries out operations, the operations comprising: causing each of the plurality of light-emitter devices to emit an impulse, wherein the impulse comprises at least one light pulse, wherein the plurality of the impulses is emitted from the plurality of light-emitter devices based on a firing order, characterized in that between temporally-adjacent impulses emitted from light-emitter devices in a given group, an impulse from a light-emitter device in at least one other group is timed to occur, wherein between temporally-adjacent impulses emitted from a given light-emitter device, an impulse from at least one other light-emitter device in the same group is timed to occur, wherein the plurality of impulses is emitted among the plurality of groups based on a predetermined group order, and wherein the predetermined group order is configured so as to temporally separate light pulses emitted by spatially adjacent groups. causing each of the plurality of light-emitter devices to emit an impulse, wherein the impulse comprises at least one light pulse, wherein the plurality of the impulses is emitted from the plurality of light-emitter devices based on a firing order, characterized in that between temporally-adjacent impulses emitted from light-emitter devices in a given group, an impulse from a light-emitter device in at least one other group is timed to occur, wherein between temporally-adjacent impulses emitted from a given light-emitter device, an impulse from at least one other light-emitter device in the same group is timed to occur, wherein the plurality of impulses is emitted among the plurality of groups based on a predetermined group order, and wherein the predetermined group order is configured so as to temporally separate light pulses emitted by spatially adjacent groups. <EOS>