NIGHT SKY AND DARK ENVIRONMENTS: BEST MANAGEMENT PRACTICES FOR ARTIFICIAL LIGHT AT NIGHT ON BLM-MANAGED LANDS TECHNICAL NOTE 457 64 5.6.2 Reduce Light Levels of Security Cameras to the Minimum Required for Proper Functioning Consider minimum light level requirements for security camera function in areas requiring security monitoring. Thermal infrared (night vision) security cameras that can function in complete darkness are recommended. If lighting levels can be lowered, this practice reduces ecological and human health effects, while saving money and energy. Notes: This practice requires knowledge of the minimum effective lighting level required for the particular security camera used. 5.6.3 Replace Existing Lights with Lower-Output Light Sources Where there is excessive illumination, replace existing lights with lower-output light sources. This practice reduces ecological and human health effects, while saving money and energy. Using dimming technology may also improve safety and security in over-lighted/glare situations. Notes: Effort and expense is required to purchase and install replacement lighting; however, the purchase expense may be recouped through lower energy costs. Knowledge of minimum effective lighting level is required and will likely require consultation with a qualified lighting designer. 5.6.4 Use Dimming Lighting Controls to Reduce Over-Illumination Dimmable luminaires and continuous autodimming lighting controls reduce over-illumination by adjusting luminance levels for different tasks or ambient lighting conditions in real time. These technologies reduce ecological and human health effects, while saving money and energy. Dimming technology may also improve safety and security in over-lighted/glare situations. Make sure the LED luminaire has a dimmable driver. Notes: Effort and expense is required to purchase, install, program, and maintain the dimming technology; however, dimming greatly extends the life of LED luminaires, which reduces maintenance expenses. 5.6.5 Dim Lighting by 30 to 50 Percent after High Traffic Hours in Public Spaces that Must Stay Illuminated Consider dimming lighting in public spaces that are frequented at night and that must stay illuminated by at least 30 to 50 percent after high traffic hours. Dim when feasible without going below the recommended minimum illuminances. Use motion or other sensors to restore full luminance when needed. Reducing the intensity of the lighting reduces ecological and human health effects, while saving money and energy. Notes: Effort and expense is required to purchase, install, program, and maintain the dimming technology; however, dimming greatly extends the life of LED luminaires, which reduces maintenance expenses. Use the minimum amount of lighting required for security cameras, or better still, use infrared security cameras.
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