The mark your light leaves on the night
Understand and protect the natural night.
Try "Ottawa" or "152 Elgin St" or "Banff National Park"
Photograph your fixture or its packaging, or enter the details manually below.
Fixture type
Colour temperature — check the bulb or packaging
Shielding — does light spill upward or only go down?
Timer or motion control
Select or photograph a fixture to see its dark sky compliance verdict.
Dark sky compliance
Generating verdict…
Compliance checks
What to do about it
Generating recommendation…
Every light installed after dark is a decision about what lives here.
Reading the night at …
The night around
June
After dark, this place is far from empty. Here is what is awake nearby, and how it changes through the year.
Light is the biggest change we bring to the night.
It disrupts the insects first, then the bats, owls and birds that feed on them, and the food chain that links them. It reaches us too, in our sleep and our health.
Each point is a real wildlife record nearby