3D Compositing with Action > Action: Lights and Lighting Effects > Light Menu Settings >
Using the Light Bevel Curve

The bevel curve allows you to create unique lighting effects in conjuntion with the Spread field in the Light Basics tab. Since a spread value of 90 or less creates a spotlight, you can then create a bevel curve to act as a multiplier of the spotlight intensity.

For example, a curve such as this.

Results in a lighting ripple-like effect.

TipTo create black holes in your lighting effect, use values below zero on the Bevel curve.