Lighting Trends Map
This light trend analysis map shows the Basin & Range Dark Sky Cooperative (BRDSC) boundary (in red) and the hot spots for light pollution. The Las Vegas and Reno regions are the most immediate threats to light pollution encroachment into the BRDSC region. Clicking on the map will give you the opportunity to select your own area to see how light pollution is trending in your area. (Use the polygon tool in the upper left corner to select an area you want view.)
Over the past eight years, the light radiance trend in the Great Basin has been ticking upwards. This trend line makes our efforts to reduce light pollution and preserve our dark night skies more important than ever.
Lighting Principles
The lighting principles outlined here are meant to provide some suggestions on how we can have fewer impacts to the nocturnal environment, reduce light trespass, and be better neighbors.
USEFUL – All light should have a clear purpose.
Before installing or replacing a light, determine if light is needed. Consider how the use of light will impact the area, including wildlife and the environment. Consider using reflective paints or self-luminous markers for signs, curbs, and steps to reduce the need for permanently installed outdoor lighting.
TARGETED – Light should be directed only to where needed.
Use shielding and careful aiming to target the direction of the light beam so that it points downward and does not spill beyond where it is needed.
LOW LIGHT LEVELS – Light should be no brighter than necessary.
Use the lowest light level required. Be mindful of surface conditions as some surfaces may reflect more light into the night sky than intended.
CONTROLLED – Light should be used only when it is useful.
Use controls such as timers or motion detectors to ensure that light is available when it is needed, dimmed when possible, and turned off when not needed.
COLOR – Use warmer color lights where possible.
Limit the amount of shorter wavelength (blue-violet) light to the least amount needed.