A light box includes a LED light tube including a first cap, a second cap, a first light body and a second light body. The first light body has a first main light emitting direction and the second light body has a second main light emitting direction. The first cap and the second cap each have two pins. The first cap and the second cap is fixed at two ends of the first light body providing a power to the first light body and the second light body. The angle between first main light emitting direction and the second main light emitting direction is adjustable by adjusting a relative position between the first light body and the second light body.