1. Start with the sign for "light." This is done by forming a "C" handshape with your dominant hand and moving it forward and upward in a sweeping motion.
2. Then, make a "5" handshape with your dominant hand and move it outwards in a circular motion. This represents the light spreading out.
The entire sign should be fluid and continuous, making a smooth transition from the "light" sign to the "spreading" motion.
You can also add context to the sign by using facial expressions or pointing to something that is radiating, such as a sun or a hot object.