Washington Chapter
DarkSky International
Making a Difference!
International Dark Sky Week April 15-22, 2023
About International Dark Sky Week 2023
Every year, the International Dark-Sky Association (IDA) hosts International Dark Sky Week during the month of April in order to create greater awareness about light pollution and its negative consequences, the solutions, and simultaneously celebrate the night. This year, IDA is inviting everyone to discover the night during the week of April 15-22. This is an exciting opportunity to create interest and bring new people into the dark sky movement.
There are many ways to get involved including sharing the Five Principles of Responsible Lighting listed here and seen in
the graphic below.
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.
Dark skies start at home! Using IDA resources you can certify your home as Dark Sky Friendly! Watch IDA's video and get started with IDA's Home Lighting Assessment. Simple changes lead to home lighting that is functional, beautiful, and energy efficient.
