NIGHT SKY AND DARK ENVIRONMENTS: BEST MANAGEMENT PRACTICES FOR ARTIFICIAL LIGHT AT NIGHT ON BLM-MANAGED LANDS TECHNICAL NOTE 457 54 5.3.2 Switch Off or Dim Lighting during Times of Critical Biological Activity Switch off or dim lighting during high biological activity, such as during foraging, breeding, or dispersal/migration. This practice will reduce effects on wildlife. Notes: Some facilities are unable to lower/restrict lighting because of safety/security concerns or task requirements, especially if already implementing effective lighting BMPs. Manual lighting control is an option in many cases. 5.3.3 Include Lighting Season/Date Restrictions in Operations Permits Limiting when locations may be illuminated by seasons or periods of human occupancy protects resources. Consider plant and animal needs too (e.g., bird migration) or periods of concentrated human use (e.g., historical reenactments on historic trails). These actions will protect ecological processes dependent on natural night darkness as well as heritage values. Notes: Season/date restrictions may impede certain activities from occurring at night. Dependent on the purpose and need of the permit/activity, this practice may increase the need for discussions to make such decisions and to include appropriate planning and coordination. Networked outdoor lighting control systems used with sensors and timers can limit lighting to the times needed. Pacific Northwest National Laboratory
RkJQdWJsaXNoZXIy NTkzMzk=