By coating a material with a filter or beam splitter, you can adapt a light beam. This will allow you to couple out parts of the signal in the. Light shields are accessories designed to control the direction of light from fixtures like floodlights, streetlights, and parking lot lamps. They reduce glare, prevent light trespass, and help comply with dark-sky regulations. By focusing light only where it's needed, they improve safety, comfort. Summary: Covering LED lights can be a way to achieve a desired lighting effect, such as diffusing the light or changing its color. Some of the key properties to keep in mind when.