Leather panels over the lobby’s marble walls lend warmth and acoustical dampening to the previously hard-edged space, while disguising the new power supply panels. Photo © Garrett Rowland

Working with the late Washington, D.C.–based lighting consultant Patricia Kazinski and Westlake, Ohio–based engineer-build firm GPI Design, Hickok Cole also harnessed electric illumination to connect lobby and street by running four 105-foot-long by 14-foot-wide “ribbons” of 3500-Kelvin light from the canopy undersides to the lobby’s rear.

That solution replaced the myriad coffers overlooking Johnson’s entrance. Hickok Cole senior associate Bertin Radifera recalls that swapping coffers for ribbons “was an easy decision. The original grid was a little fussy, and the high hats installed behind the coffers didn’t properly light the space.” To achieve uniform illumination, the designers specified LED sheets with a typical diode spacing of 1 inch on center, and placed these in a precisely calculated airspace behind a ½-inch-thick diffusion-layer of glass with satin etching. The sheets have different orientations, based on their location within the ribbon, so that the glass surface is lit from edge to edge without hot spots. Additional LED strings were placed within the assembly, where necessary, to eliminate shadows.

Cove-lit piers on the concourse (above) mimic Johnson’s fluted columns and appear to extend through the floor. Photo © Garrett Rowland

The ribbons are powered by the ceiling’s existing energy source, but the project team had to place coordinating controls and drivers within reach of building managers. Electrical- supply panels hidden within each side of the lobby provide that access. The entire system is DMX-controlled and dimmable per panel, and lighting intensity cycles through a series of preset scenes during the day. Manual and sensor-triggered overrides adjust brightness according to daylight availability.

Photo © Garrett Rowland

In addition to making an urbanistic statement to the surrounding neighborhood, the ribbons draw Washingtonians into Franklin Square, where they will find that Hickok Cole’s modernization stretches over 31,000 square feet of now-public interiors. The effort introduces new functions to an expanded lobby area, most notably lounge seating, a café, and lower-concourse-level conference facilities. Architectural gestures correspond to the programming changes: two new slab openings foster visual connections between the lobby and downstairs, for instance, and cove-washed pillars in that concourse appear as if extruded from Philip Johnson’s towering columns overhead. What was once a corporate fortress now feels more like a city within the nation’s capital.