The Bullitt Center Experience: The Light Dynamic -- Measured Performance of Lighting and Daylight

This paper presents measured daylighting, electric lighting, and lighting controls system performance data collected at the Bullitt Center, a 5016 m² (54,000 ft²) six-story office building in Seattle, WA (Bullitt, 2014). Bullitt Center is the largest urban office building to attempt to meet the Living Building Challenge (ILFI, 2014) which prescribes operating at net-zero energy performance. To meet this goal, the lighting system is designed to consume 67% less energy than a current similar-sized code-compliant Seattle office building. To achieve this goal while maintaining a high-quality luminous environment, the building is designed to use daylight as the primary source of illumination. This paper aims to provide a comprehensive view of qualitative and quantitative daylight and electric lighting system performance to meet net-zero energy; and discusses design intent and measured outcomes in a range of sky conditions and times of year within a tenant suite.

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