Three issues relating to Light and Glare have been
identified as part of this JLUS.
LG-1 Increase in electronic billboards may impact night training.
LG-2 There is potential for future impacts to night training at Florence
Military Reservation.
LG-3 Future growth may impact night training at Silverbell Army
Heliport and Picacho Peak Stagefield.
Key Terms
Glare. Glare is the presence of excessively bright light, such as direct or reflected
sunlight or from artificial lights, such as sport field and stadium lights. Glare reduces
visibility and can completely impair vision when very intense.
Light pollution. Light pollution is created by the artificial brightening of the sky that
results from development, including street lights and other man‐made sources.
Light Pollution Map Info. Light Pollution Map Info is a computer application tool that
projects light pollution data on top of base data layers such as roadways.
Light radiance. Light radiance measured in radiance units (W / cm2 * sr), is the radiant
flux emitted, reflected, transmitted or received by a surface, per unit solid angle per unit
projected area.
Naked eye. Naked eye is a term used to refer to night‐time vision without the use of aids
such as Light and Glare (LG).
Nit. A Nit is a metric unit of luminance defined as a candela per square meter.
Trespass lighting. Trespass lighting is spill light that encroaches onto neighboring
properties.
Visible Imaging Infrared Radiometer Suite. Visible Imaging Infrared Radiometer Suite
(VIIRS) collects visible and infrared imagery via satellite. The data is used to support land,
ocean and cloud based science. Improving scientists understanding of climate change is
one example where VIIRS data is used. The data is also used to project light pollution
across the world using a “Light Pollution Map Info” computer application.
Background Report
5-97