A light-emitting device, comprising: - a first lighting sub-module having at least one first micro-lighting unit, each of the first micro-lighting units comprising a first pair of LEDs reversely connected in parallel; - a second lighting sub-module having at least one second micro-lighting unit, each of the second micro-lighting units comprising a second pair of LEDs reversely connected in parallel; - a selection unit electrically connected to the first lighting sub-module and the second lighting sub-module, wherein: - a first voltage feed point of the selection unit is electrically connected to a first terminal of the first lighting sub-module; - a second voltage feed point of the selection unit is electrically connected to a second terminal of the first lighting sub-module and a first terminal of the second lighting sub-module; - a third voltage feed point of the selection unit is electrically connected to a second terminal of the second lighting sub-module; characterized in that: the selection unit is configured to select at least two of the first voltage feed point, the second voltage feed point, and the third voltage feed point (37b, 37c) in dependence on a voltage type or a voltage magnitude provided from a power source; wherein when the first voltage feed point and the third voltage feed point are selected by the selection unit, one loop is formed by the first voltage feed point, the first lighting sub-module the second lighting sub-module and the third voltage feed point; or wherein when the first voltage feed point, the second voltage feed point and the third voltage feed point are selected by the selection unit, a first loop is formed by the first voltage feed point, the first lighting sub-module and the second voltage feed point, and a second loop is formed by the second voltage feed point, the second lighting sub-module and the third voltage feed point. - a first lighting sub-module having at least one first micro-lighting unit, each of the first micro-lighting units comprising a first pair of LEDs reversely connected in parallel; - a second lighting sub-module having at least one second micro-lighting unit, each of the second micro-lighting units comprising a second pair of LEDs reversely connected in parallel; - a selection unit electrically connected to the first lighting sub-module and the second lighting sub-module, wherein: - a first voltage feed point of the selection unit is electrically connected to a first terminal of the first lighting sub-module; - a second voltage feed point of the selection unit is electrically connected to a second terminal of the first lighting sub-module and a first terminal of the second lighting sub-module; - a third voltage feed point of the selection unit is electrically connected to a second terminal of the second lighting sub-module; the selection unit is configured to select at least two of the first voltage feed point, the second voltage feed point, and the third voltage feed point (37b, 37c) in dependence on a voltage type or a voltage magnitude provided from a power source; wherein when the first voltage feed point and the third voltage feed point are selected by the selection unit, one loop is formed by the first voltage feed point, the first lighting sub-module the second lighting sub-module and the third voltage feed point; or wherein when the first voltage feed point, the second voltage feed point and the third voltage feed point are selected by the selection unit, a first loop is formed by the first voltage feed point, the first lighting sub-module and the second voltage feed point, and a second loop is formed by the second voltage feed point, the second lighting sub-module and the third voltage feed point.