How many exterior lights do you have around your home or property? Are you sure? Have you carefully considered each fixture’s need, function, or design? Are you minimizing light pollution in your own backyard? If not, you’re not alone. Unfortunately, much of our outdoor residential lighting is inefficient, poorly installed, or altogether unnecessary.
These misguided lighting practices contribute to light pollution, which can disrupt wildlife, impact human health, and waste money and energy. As of 2018, the average American wastes 41-103 pounds of CO2 per year on excessive residential outdoor lighting alone (1). Across the country, this amounts to at least $1.4 to $3.5 billion wasted each year, unnecessarily lighting the dark around our homes. Our analysis also indicates that these numbers may grow as Americans are likely consuming more exterior lighting than ever before (2).
Here’s the bright side: Light pollution is completely reversible.
BASIC LIGHTING PRINCIPLES
With the responsible lighting practices, it is possible to reduce light pollution and create a beautiful, healthy, and safe lit environment where you live and work. Let’s learn the basics and put them to work.
Even the simplest actions can make a big difference.
DID YOU KNOW? 20% – 50% of outdoor residential lighting is lost to the night sky, due to poor shielding alone (3).
Want to protect the night from light pollution? Get started in your own backyard (or front porch, walkway, bedroom window, rooftop – anywhere!)
Download and follow this step-by-step guide to conduct an outdoor lighting assessment around your house, apartment building, property line, business, community center, wherever, to evaluate the impact of your light on the night.
TAKE CONTROL OF YOUR LIGHT
Once you’ve identified the problem areas around your home or business, take the appropriate actions to reduce light pollution around your property whether it’s removing a light entirely, using timers or motion sensors, or replacing the fixture with a dark sky friendly option.
Bonus points: Interior lighting can also have an impact on the outside environment. Assess the light trespass from inside your home to the outside and take the appropriate actions – use a timer, close your curtains, install blinds, etc.
FINDING DARK SKY FRIENDLY LIGHTING
Did you know? IDA works with lighting manufacturers and home retail stores so that you can easily source IDA-approved Dark Sky Friendly lighting. View IDA-approved residential lighting solutions.
…MY NEIGHBOR’S LIGHTING?
So you’ve addressed all your problem lighting, but what about the lighting that is beyond your control? Maybe your neighbor’s lighting is shining in your bedroom window, or your landlord or property manager needs to make changes. Check out these tips for working with your neighbor’s lighting.
It’s important that your property is safe and responsibly lit to protect you from potential hazards, support wayfinding, or deter potential crime. But brighter does not equal safer. In fact, too much lighting can have the opposite effect. Learn more about lighting, crime and safety.
Estimates suggest that on average street lighting accounts for about 50% of a city’s total light emissions (4). Learn what you can do about streetlights in your community.
I’VE ADDRESSED THE ISSUE AT HOME, NOW WHAT?
Ready for the next step? Learn what you can do to take action today for a better night tomorrow. The universe will thank you.
- Range represents high and low estimates. Metric does not consider commercial and public lighting.
- Calculations by IDA from U.S. Department of Energy Energy Information Agency and U.S. Census Bureau data
- P. D. Hiscocks, S. Gudmundsson, The Contribution of Street Lighting to Light Pollution, Journal of the Royal Astronomical Society of Canada 104 (5) (2010) 190.
J. C. Barentine, et al., Skyglow changes over Tucson, Arizona, resulting from a municipal LED street lighting conversion, Journal of Quantitative Spectroscopy and Radiative Transfer 212 (2018) 10–23.
S. Bará, et al., Estimating the relative contribution of streetlights, vehicles, and residential lighting to the ur- ban night sky brightness, Lighting Research & Technology (2018) 147715351880833