A light emitting device, comprising: six GaN-based light emitting diodes (1a-1f) of the same size monolithically formed in a two-dimensional pattern consisting of two rows on an insulating substrate, wherein the light emitting diodes (1a-1f) are connected in series, and wherein each light emitting diode (1a-1f) has a planar L-shape comprising a longer external side, a shorter external side, a longer internal side, and a shorter internal side, wherein a first light emitting diode, a second light emitting diode, and a third light emitting diode are arranged linearly in a first row, wherein the longer external side of the first light emitting diode faces the longer external side of the second light emitting diode, and the shorter internal side of the second light emitting diode faces the shorter internal side of the third light emitting diode. wherein a fourth light emitting diode, a fifth light emitting diode, and a sixth light emitting diode are arranged linearly in a second row, wherein the shorter internal side of the fourth light emitting diode faces the shorter internal side of the fifth light emitting diode, and the longer external side of the fifth light emitting diode faces the longer external side of the sixth light emitting diode, wherein the light emitting device further comprises: a first electrode and a second electrode arranged on the insulating substrate, wherein the first electrode and the second electrode have a planar square shape, wherein the longer internal side and the shorter internal side of the first light emitting diode face the first electrode, and wherein the longer internal side and the shorter internal side of the sixth light emitting diode face the second electrode, and wherein the shorter external side of the first light emitting diode faces the shorter external side of the sixth light emitting diode, such that the overall shape of the light emitting diodes and the first and second electrodes is approximately square. six GaN-based light emitting diodes (1a-1f) of the same size monolithically formed in a two-dimensional pattern consisting of two rows on an insulating substrate, wherein the light emitting diodes (1a-1f) are connected in series, and wherein each light emitting diode (1a-1f) has a planar L-shape comprising a longer external side, a shorter external side, a longer internal side, and a shorter internal side, wherein a first light emitting diode, a second light emitting diode, and a third light emitting diode are arranged linearly in a first row, wherein the longer external side of the first light emitting diode faces the longer external side of the second light emitting diode, and the shorter internal side of the second light emitting diode faces the shorter internal side of the third light emitting diode. wherein a fourth light emitting diode, a fifth light emitting diode, and a sixth light emitting diode are arranged linearly in a second row, wherein the shorter internal side of the fourth light emitting diode faces the shorter internal side of the fifth light emitting diode, and the longer external side of the fifth light emitting diode faces the longer external side of the sixth light emitting diode, wherein the light emitting device further comprises: a first electrode and a second electrode arranged on the insulating substrate, wherein the first electrode and the second electrode have a planar square shape, wherein the longer internal side and the shorter internal side of the first light emitting diode face the first electrode, and wherein the longer internal side and the shorter internal side of the sixth light emitting diode face the second electrode, a first electrode and a second electrode arranged on the insulating substrate, wherein the first electrode and the second electrode have a planar square shape, wherein the longer internal side and the shorter internal side of the first light emitting diode face the first electrode, and wherein the longer internal side and the shorter internal side of the sixth light emitting diode face the second electrode, and wherein the shorter external side of the first light emitting diode faces the shorter external side of the sixth light emitting diode, such that the overall shape of the light emitting diodes and the first and second electrodes is approximately square.