An apparatus is provided for effecting an optical barrier and includes a light source emitting a beam. The apparatus also includes a moveable mirror and an actuator to move the mirror to reflect the beam into a plurality of directions or locations. In some embodiments, the apparatus also includes a processor and a memory chip including a sequence of instructions. The memory chip and the sequence of instructions causes the processor to receive data from a sensor system that indicates a location of a pest and operate the actuator to move the mirror to direct the beam to sweep through a range of directions that include the location of the pest. A light fixture is also provided, that includes the apparatus.