Abstract: A lighting device includes a housing, a light emitting module, a press plate and a fixing member. The housing has a bottom plate, a base and multiple stopping portions. The base protrudes from the bottom plate, and has a top surface and an inclined surface. The stopping portions are arranged at the bottom plate and extend to a bottom portion of the inclined surface of the base. The light emitting module includes a light panel and multiple light emitting elements arranged thereon. The light panel leans on the inclined surface and stopped by the stopping portions. The press plate is located at the top surface, and presses against the light panel. The fixing member fixes the press plate at the top surface to cause the press plate to press the light panel downward, so as to fix the light panel on the inclined surface.

Abstract: An optical element includes a light entry surface configured to receive light, a light emission surface having a first light emission sub-surface and a second light emission sub-surface connected to each other, and a reflecting surface having a first reflecting sub-surface and a second reflecting sub-surface connected between the first reflecting sub-surface and the second light emission sub-surface. A first portion of the light is transmitted to the light entry surface and the first light emission sub-surface in sequence. A second portion of the light is transmitted to the light entry surface, the second reflecting sub-surface, and the second light exit sub-surface in sequence. A third portion of the light is transmitted to the light entry surface, the first reflecting sub-surface, the second reflecting sub-surface, and the second light emission sub-surface in sequence.

Abstract: A method for coordinating warning devices and a warning device are provided. The method is used to coordinate a plurality of warning devices. The method includes: providing a first warning device and at least one second warning device, wherein the first warning device has a first controller and each second warning device has a second controller; generating a first result and a second result according to an operation; operating the first controller in a first mode or a second mode according to the first result and the second result; and generating a first driving signal by the first controller if the first controller is in the first mode.

Abstract: An optical element includes a light entry surface configured to receive light, a light emission surface having a first light emission sub-surface and a second light emission sub-surface connected to each other, and a reflecting surface having a first reflecting sub-surface and a second reflecting sub-surface connected between the first reflecting sub-surface and the second light emission sub-surface. A first portion of the light is transmitted to the light entry surface and the first light emission sub-surface in sequence. A second portion of the light is transmitted to the light entry surface, the second reflecting sub-surface, and the second light exit sub-surface in sequence. A third portion of the light is transmitted to the light entry surface, the first reflecting sub-surface, the second reflecting sub-surface, and the second light emission sub-surface in sequence.