Abstract: Provided is an LED lamp, which may include a filter which has a dome part, a flange having a plurality of protrusions or grooves formed at a predetermined distance from each other, and a cylindrical part having a screw thread formed on the outer circumferential surface thereof. The filter can be simply replaced or mounted by rotating the filter using the protrusions or grooves formed on the flange exposed to the outside. Thus, the LED lamp can easily convert light into white light having a color temperature desired by a user or various colors of light.

Abstract: The present invention relates to an advertisement offering method and a system for a wireless display board.

Abstract: An emergency lighting fixture includes a frame employing an indicator on the front of the frame, an illumination lamp installed in the inside of the frame, a laser projector exposed to the front of the frame from the inside of the frame, an angle adjusting unit for adjusting a projecting angle of the laser projector, and an emergency power supplying battery, installed in the inside of the frame, for impressing a power supply into the illuminating lamp and the laser projector in response to a signal of a fire sensor in the event of fire.

Abstract: Disclosed is an emergency lighting fixture comprising: a frame employing an indicator on the front of the frame; an illumination lamp installed in the inside of the frame; a laser projector exposed to the front of the frame from the inside of the frame; and an emergency power supplying battery, installed in the inside of the frame, for impressing a power supply into the illuminating lamp and the laser projector in response to a signal of a fire sensor in the event of fire.