Filter

A lighting filter is a transparent material that can be placed in front of a light fixture or lens to alter the color and intensity of the emitted light. Filters are commonly used in photography and stage lighting to create dramatic effects, as well as in medical and scientific applications to reduce glare and improve contrast. They come in many forms, including colored gels, paint-on films, holographic foil screens and specialized plastic sheets. Lighting filters can also be combined to create specific colors, shapes and patterns for more complex lighting needs.