Donate Join

Judge Ruled Against City of Monterey Over LED Conversion

Judge Ruled Against City of Monterey Over LED Conversion Thumbnail

Recently, a judge ruled against the city of Monterey, stating they violated the California Environmental Quality Act and the Brown Act when they began their LED streetlight conversion in 2009. A group of Monterey residents calling… Read More

Contact Your Elected Official to Fight Against Blue-Rich LED Street Lighting

Contact Your Elected Official to Fight Against Blue-Rich LED Street Lighting Thumbnail

Many cities across the globe are replacing their older street lights with newer LED technology. Specifically, with the blue-rich white LED (light-emitting diode) lighting. While many praise the LED conversions as a money saving and… Read More

Call to Action! Contact Chicago’s Administration to Demand a Responsible Outdoor Lighting Plan

Call to Action! Contact Chicago’s Administration to Demand a Responsible Outdoor Lighting Plan Thumbnail

IDA’s Executive Director, Scott Feierabend has sent an urgent letter to Chicago’s Mayor, Rahm Emanuel’s regarding the proposed outdoor lighting plan. This letter urges Emanuel and his Administration to choose a safe, responsible outdoor lighting… Read More

Why is Blue Light at Night Bad?

Why is Blue Light at Night Bad? Thumbnail

New technical capabilities often come with unanticipated challenges. White LED lighting often has much higher levels of potentially harmful blue light. In 2010, IDA published its paper, “Visibility, Environmental, and Astronomical Issues Associated with Blue-Rich White… Read More

5 Ways to Celebrate Dark Sky Week!

5 Ways to Celebrate Dark Sky Week! Thumbnail

1. During International Dark Sky Week, get together with friends and family and go outside at night. A lot of us don’t take the opportunity to experience the nighttime environment. Go outside, look up and… Read More

5 Popular Myths About LED Streetlights

Streetlights on city street at night create glare making it hard to see.

The rapid changes in LED lighting technology have given rise to an LED retrofit revolution. Across the globe, municipalities are opting to switch out their older street lighting to new, more energy-efficient LEDs. Unfortunately, these… Read More

Eyes In The Sky: Exploring Global Light Pollution With Satellite Maps

Eyes In The Sky: Exploring Global Light Pollution With Satellite Maps Thumbnail

Billions of people around the world routinely experience light pollution in the form of skyglow, the ever-present “haze” of light over cities at night. It comes from light on the ground scattering in the atmosphere… Read More

5 Appalling Facts about Light Pollution

Light pollution in Los Angeles obscures the night sky.

  The sky glow of Los Angeles is visible from an airplane 200 miles away. Residents of L.A. haven’t been able to see the stars for a while. In fact some city dwellers don’t even… Read More

The Importance of Awe

The Importance of Awe Thumbnail

The “11th emotion” got many of us into astronomy. Can children today still experience it? Guest post by William Sheehan, courtesy of Sky & Telescope While struggling in abject poverty in Nashville after the Civil… Read More

What Do Dark Skies Mean to You?

What Do Dark Skies Mean to You? Thumbnail

Guest Post by Emma Marrington, senior rural policy campaigner for Campaign to Protect Rural England (CPRE) When was the last time you experienced a truly dark, star-filled night sky, even in the countryside? Or saw the… Read More