One embodiment is a lighting device. The lighting device comprises a first case comprising a first extension part and a second extension part; a first light emitter disposed in the first case; a first diffuser disposed in the first case and over the first light emitter; a second case comprising a third extension part and a fourth extension part; a second light emitter disposed in the second case; a second diffuser disposed in the second case and over the second light emitter; and a bracket coupled to the second extension part and the third extension part.