Light Pollution
Light pollution is the brightening of the night sky caused by scattered artificial light. Discover why it is a problem and how we can solve it together.
What Is Light Pollution?
Light pollution occurs when artificial light is cast where it is not needed, especially towards the sky. It creates a glow that hides the stars and seriously affects nocturnal biodiversity.
In Spain, more than 80% of the population lives under polluted skies and cannot see the Milky Way from where they live.
Impacts of Light Pollution
Excess artificial light has consequences far beyond losing sight of the stars.
Loss of the Night Sky
Most of the world's population can no longer see the Milky Way from where they live.
Impact on Biodiversity
Artificial light disrupts the natural cycles of plants, insects, birds and nocturnal mammals.
Effects on Health
Night-time exposure to artificial light can disrupt circadian rhythms and affect rest.
Energy Waste
An estimated one third of outdoor lighting is unnecessary, wasting energy and resources.
The Solution: Smart Lighting
At Astroval we promote the five pillars of sustainable lighting.
Usefulness
What to light?
Only what is strictly necessary for safety or traffic. Avoid unnecessary ornamental lighting.
Directionality
Where to?
Always direct the beam downwards, shielded and confined to the area of use. ULOR = 0%.
Intensity
How much light?
The lowest light level that still guarantees safety. Avoid over-lighting.
Spectrum
Which colour?
Favour warm tones (≤3000K) to reduce atmospheric scatter and protect biodiversity.
Timing
When?
Light only when users are present. Use motion sensors and timers.
Our Technical Standards
ULOR = 0% (Upward Light Output Ratio)
We require all outdoor luminaires from our members to emit zero light towards the sky. No light should be projected above the horizontal plane.
CCT ≤ 3000K (Colour Temperature)
We only allow warm light to minimise atmospheric scatter. Cool white light (>4000K) is forbidden in our members' installations.
SQM Measurements (Sky Quality Meter)
We use professional photometers to measure sky quality in magnitudes per square arc second (mag/arcsec²). A higher value means a darker sky.