High Performing Buildings - Winter 2009 - (Page 30)

Glass partitions and interior windows maintain daylight and views through enclosed spaces. 48 in., giving 97% of seated spaces a view to the outdoors. The lighting design is a threetiered strategy of natural, ambient, and task lighting. After removing as many interior obstructions as possible, daylighting effectiveness was improved by adding new rolling window shades to control glare on all exposures. Automated daylight controls linked to photo sensors were specified for all fixtures in the main studio, to minimize the use of artificial light during daylight hours. Fixtures on the northeast perimeter 30 HigH Performing were programmed on the control system’s astronomical time clock to switch off during the day and switch on two hours before sunset. Interior fixtures respond to natural light levels by dimming. Next, taking a cue from an old postcard that showed the original Simpson, Crawford, Simpson dining room, up-light fixtures were mounted to the studio’s free-standing columns, recalling the original scheme’s column-mounted sconces. The lighting scheme intentionally highlights the detail of the ceiling Winter 2009 while keeping the ceiling plane clear. Ambient light quality is improved by reflecting light off the white ceiling, providing diffused light to the workstations below. Metal halide sources with a warm, 3000K color temperature were selected to provide efficient, high-output light within comparatively small fixture packages. Electronic dimming ballasts were a relatively new technology for metal halide sources, and 10 of the ballasts initially failed and were replaced. These ballasts dim the ambient Buildings

Table of Contents for the Digital Edition of High Performing Buildings - Winter 2009

High Performing Buildings - Winter 2009
Contents
Commentary
OHSU Center for Health & Healing
Documenting Performance
Cook+Fox Architects Office
5 Houston Center
Skanska's Atlanta Office
Advertisers Index

High Performing Buildings - Winter 2009