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Anatomy of an award: IES illumination award of merit.

At 30,000 sq ft, A/E firm Arcturis occupies the largest space in its St. Louis high-rise office building. It also uses the least amount of energy. To play up the good bones of the gutted space, Arcturis designers Ron Johnson and Brian Waite had the unique waffle slab ceiling painted white to maximize height and reflectance and had the open office arranged around floor-to-ceiling perimeter windows that look out onto the city. The lighting scheme, designed by Johnson, Waite and Bill Shaw from William Tao & Associates, features just a few lamp types that perform a variety of techniques. Linear fluorescent T5s, for example, are used for direct, indirect, wall wash, recessed and cove lighting. In total, the lighting is nearly 28 percent below ASHRAE/IES 90.1-2004 requirements and helped the space earn a LEED CI Silver certification.

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Arcturis Office

1 Linear direct/indirect pendants with 54-W T5 lamps illuminate the open office. Perimeter lights have daylight harvesting sensors.

2 Fluorescent T5s are also used for wall washing. "Lighting vertical surfaces makes the space seem brighter," says Waite.

3 A floating ceiling defines reception area. "We used cove lighting to really set off the ceiling," says Johnson.

4 Recessed in the floating ceiling, CFL downlights add visual interest. Light levels were lowered to accommodate video monitors.

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Author:Hall, Elizabeth
Publication:LD+A Magazine
Date:Mar 1, 2011
Words:222
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