CompuServe Messages

I needthe help of someone a little more experienced than I. I am trying to simulate flashing lights on the wing tips of an airplane for use in ana animation. I've created self – illuminated G-Spheres for the lights, but this gives a constant light. i also placed an omni light in each sphere to provide the illumination of the surrounding wing area. But how can I create lights that flash? The only way I can think of would require me to basically create a new light for each frame of the animation – about 1200 total! – which obviously isn't gonna' do! Any suggestions? Thanks Craig Fries