Valokaappaus

Valokaappaus is a Finnish term that translates to "light theft" or "light capture." It refers to the phenomenon of excessive and unwanted artificial light illuminating areas that are not intended to be lit, often spilling from adjacent properties or public lighting. This can include light trespass into homes, gardens, or natural areas, disrupting the intended darkness.

The primary causes of valokaappaus are poorly designed or aimed lighting fixtures, over-illumination, and the use of unshielded lamps that emit light in all directions rather than directing it downwards. Factors such as reflection from surfaces, atmospheric scattering, and the lack of sufficient screening or landscaping also contribute.

Consequences of valokaappaus can range from mild annoyance to significant environmental and human health impacts. For residents, it can lead to sleep disturbances, reduced enjoyment of outdoor spaces, and a diminished view of the night sky. Ecologically, excessive artificial light can disorient nocturnal animals, disrupt plant growth cycles, and affect insect populations. It also contributes to light pollution, obscuring the visibility of stars and celestial bodies.

Addressing valokaappaus typically involves implementing better lighting design principles, using shielded and directed light fixtures, reducing light intensity where possible, and employing light-reducing measures like louvers or planting vegetation. Awareness and responsible lighting practices by individuals and municipalities are key to mitigating its effects.