What term describes light focused in one area but also entering another area?

The term that best captures the concept of light focused in one area but also entering another area is spill. Spill refers to unwanted or excess light that escapes from its intended area, potentially affecting nearby spaces. This phenomenon can cause issues in lighting design, particularly in sport facilities where proper illumination is crucial for the playing environment while minimizing distractions and disturbances in surrounding areas.

Glare refers to excessive brightness that causes discomfort or reduces visibility, but it doesn’t specifically address light moving between areas. Trespass refers to light that encroaches upon areas where illumination is not intended, and while it might seem related, it does not adequately describe the intent of focusing light. Sky glow refers to the brightening of the night sky caused by artificial light, particularly in urban areas, and is also not relevant to the description of light intentionally focused in one area but also impacting another.

Understanding these distinctions is vital for those involved in sport facility management, as controlling spill can help ensure optimal lighting design and a better overall experience for athletes and spectators alike.