A light beam is a type of energy that is emitted from a source and travels in a straight line. The most common types of light beams are lasers, rays, battens, and sunrays. A LASER is a device that emits a narrow, intense beam of light. Rays are lines of light that travel in a straight line from a source. Battens are long, thin strips of material that are used to hold up a structure. Sunrays are beams of light that come from the sun.