Another problem with lights appearing to flicker or move in animations is if you have edited them during the course of the animation. If so, you probably left the keyframes in the timeline, and the light's position an attributes will change in an unpredictable way during the course of the animation. To get rid of this, either always edit the lights at frame 1 and delete any other keyframes that appear, or uncheck the "animating" box in the light's properties dialogue. Bill