Abstract: There is provided a lighting apparatus using a filter and a condenser for LED illumination in which an optical filter to obtain diverse optical patterns as a user desires is connected to a condenser for LED illumination without using any additional device. The lighting apparatus in which the optical filter can be exchanged comprises: a LED for generating a light source for illumination, a condenser for concentrating the light source generated from the LED, and an optical filter connected to the condenser, for providing an optical pattern, wherein the optical filter is connected to the condenser so as to be attachable to or detachable from the condenser.

Abstract: A focusing lens for an LED is provided.

Abstract: Provided is a controller of an illumination system in an optical engine, in which a rear end of a light tunnel is fixed to a barrel and a front end of the light tunnel is movably installed inside the barrel, comprising: control openings being respectively bored through an upper part of the barrel; control screws being respectively connected to the control openings and moving the light tunnel in an oblique direction, each control screw with an end being obliquely in contact with the light tunnel; and an elastic body being installed in the barrel, opposite to the control screws, to elastically support the light tunnel. The controller of the illumination system controls the light tunnel to be moved in the oblique direction in the barrel, thereby enabling the light tunnel to be quickly and easily moved to be controlled, improving the controllability and shortening the control time.