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Sepracor Headquarters Building 2


Working with the architects, Clifford/Hoffman Associates, we reviewed and suggested revisions to the artificial lighting design for 142,000 square feet of new office and meeting space for this pharmaceutical company. The team produced a series of 3D visualizations to demonstrate the natural lighting features in the main conference suite. The review process continued in order to make the lighting eligible for a utility energy conservation incentive payment. The target lighting load was 1.0 watt/sf maximum average overall. 

Most of the building area is office space in the form of open office landscape on the interior and closed offices at the perimeter. The open office illumination is provided by pendant semi-indirect fixtures using a single row of T5HO lamps each. The target average illuminance in the open offices falls in the range of 35 to 40 footcandles (fc) maintained at desk height. This is in the middle of the range typically recommended for ambient office lighting. The fixtures are positioned such that the light level grades off over the circulation areas. 

The closed offices are lit with 2x2 recessed indirect fixtures. The illuminance is in the range of 20-25 fc average maintained. All the offices at the perimeter have daylight most of the time they are in use. Control of the ambient lighting is by occupancy sensor with a manual override. 

The conference, training and lecture rooms are illuminated typically by a combination of 2x2 recessed indirect fixtures, dimming downlights and dimming wall washers in a perforated wood ceiling surrounded by an acoustic tile soffit. The combination of fixture types and the dimming capability allow flexibility to accommodate a variety of uses, especially audio-visual presentations. With all the lights on full the average illuminance would be in the range of 35 to 40 footcandles maintained at desk height. Each fixture type is controlled separately from the others. 

The natural lighting in the conference suite is controlled by the building massing, which creates an overhang to partly shade the window wall, and by vertical blinds. Combined with the zoning and dimming of the light fixtures these features allow the natural and artificial lighting to complement each other and ensure visual comfort in a diverse range of meeting situations.