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The BUG rating method is used for classifying luminaires based on their potential to produce backlight, uplight, and glare. This classification system provides a way to evaluate and categorize lighting fixtures in order to better control light pollution, enhance night sky visibility, and improve overall lighting quality in outdoor environments. By understanding how a luminaire emits light in these three categories, designers and planners can choose fixtures that minimize adverse effects, contribute to safety and security, and promote a more sustainable approach to outdoor lighting.

The BUG method is particularly relevant in efforts to meet sustainability goals and in achieving credits in various green building certification programs, including LEED. This systematic approach allows for better design decisions that align with environmental considerations and community standards for lighting.