A light emitting module, comprising: a body; first to M th light emitting devices (120, 130, 140, 150) disposed on the body to be spaced apart from each other, wherein M is an integer of 2 or greater; and a turn-on controller configured to control the first to M th light emitting devices (120, 130, 140, 150) to turn on, wherein each of the first to M th light emitting devices (120, 130, 140, 150) comprises first to N th light emitting cells, wherein N is an integer of 2 or greater, and wherein an n th light emitting cell among the first to N th light emitting cells comprises at least one light emitting structure, wherein 1 ≤ n ≤ N, and wherein the turn-on controller comprises first to N th switches (S1∼SN), wherein the turn-on controller further comprises a switching controller configured to control switching of the first to Nth switches according to a level of a driving voltage, and wherein said first to N th light emitting cells of an m th light emitting device among the first to M th light emitting devices (120, 130, 140, 150) are respectively connected to each other in series, wherein 1 ≤ m ≤ M; characterized in that the turn-on controller is configured to simultaneously turn on or turn off the n th light emitting cells of the first to M th light emitting devices (120, 130, 140, 150), wherein the n th light emitting cells of the first to M th light emitting devices (120, 130, 140, 150) are respectively connected to each other in parallel, and the first to N th switches (S1∼SN) are connected between a common reference potential and each respective channel (CH1, CH2, CH3, CH4) disposed between adjacent ones of each of the first to N th light emitting cells. a body; first to M th light emitting devices (120, 130, 140, 150) disposed on the body to be spaced apart from each other, wherein M is an integer of 2 or greater; and a turn-on controller configured to control the first to M th light emitting devices (120, 130, 140, 150) to turn on, wherein each of the first to M th light emitting devices (120, 130, 140, 150) comprises first to N th light emitting cells, wherein N is an integer of 2 or greater, and wherein an n th light emitting cell among the first to N th light emitting cells comprises at least one light emitting structure, wherein 1 ≤ n ≤ N, and wherein the turn-on controller comprises first to N th switches (S1∼SN), wherein the turn-on controller further comprises a switching controller configured to control switching of the first to Nth switches according to a level of a driving voltage, and wherein said first to N th light emitting cells of an m th light emitting device among the first to M th light emitting devices (120, 130, 140, 150) are respectively connected to each other in series, wherein 1 ≤ m ≤ M; characterized in that the turn-on controller is configured to simultaneously turn on or turn off the n th light emitting cells of the first to M th light emitting devices (120, 130, 140, 150), wherein the n th light emitting cells of the first to M th light emitting devices (120, 130, 140, 150) are respectively connected to each other in parallel, and the first to N th switches (S1∼SN) are connected between a common reference potential and each respective channel (CH1, CH2, CH3, CH4) disposed between adjacent ones of each of the first to N th light emitting cells.