There are a few ways to create realistic looking light beams in photos and videos. One way is to use a long exposure and capture the light as it moves through the frame. Another way is to use a light source that emits a very bright light, such as a flashlight or a laser. Finally, you can create light beams in post-production using editing software.
If you want to capture light beams in a photo, you'll need to use a long exposure. Set your camera to a low shutter speed, and use a tripod to keep the camera still. Then, point your light source at the camera and move it around in a circular motion. You'll need to experiment to find the right shutter speed for your particular setup.
If you're using a video camera, you can create light beams by pointing a very bright light source at the lens. This will create a "streaking" effect as the light moves across the frame. Again, you'll need to experiment to find the right settings for your particular setup.
Finally, you can create light beams in post-production using editing software. There are a few different ways to do this, but one method is to use a plugin called "CC Light Sweep" for Adobe After Effects. This plugin will allow you to create light beams that look very realistic.