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. , 1, 10/99 Intemational Dark-Sky Association -- Information Sheet 159 Shielding Floodlights Improving Performance to Prevent Glare, Light Trespass, and Light Pollution Outdoor floodlights are designed to "broadcast" illumination, to cover as much area as possible. The lack of"light control" in a floodlight causes many detrimental and unwanted side-effects, like: blinding glare, intrusion into neighboring homes and natural areas - called light trespass, and waste light up into the night sky - called light pollution . d Wos►e Light,Light Trespass �,�:: s,� :�: � � o� Task Area •� � Z ., :T _ � t' � :�'; ----• �______:t/ �m� •--- � �� The floodlight's exposed light source (bulb) remains in direct view from most angles -which causes disabling glare. This compromises vision for pedestrians, drivers, or police surveillance. It also disturbs neighbors, disrupts nearby wildlife, and can be visible across great distances. A three-sides shield can be installed on the floodlight to create a horizontal visor as shown. The visor should just cover the light source completely. This incorporates a "light control" feature to the fixture, allowing more precise and efficient lighting for the task area. By shielding the distracting glare from the light source, the viewer can actually see the entire area better. The light can be contained within the property area, and kept out of adjacent properties. The light normally lost up into space is now redirected to the intended task area. Some manufacturers of floodlights offer attachable visor shields. They can also easily be made from flashing aluminum or stainless steel sheet metal. Once the shields are installed, floodlights can be re-aimed at night to properly "tune" the illumination to the property boundary<as shown below. Another added benefit from shielding floodlight glare is that it creates a more