Pedestrian walkway gets lighting upgrade

A pedestrian area uses primarily LEDs to light the way between two Chicago buildings.




Figure 1: This rendering shows River North Point, a 22,000-sq-ft renovation of a lobby that connects two buildings and a hotel in the heart of Chicago. Courtesy: Perkins+WillThis 22,000-sq-ft lobby renovation in the heart of Chicago connects two buildings and a hotel; about 60,000 pedestrians walk through its doors each day. Programmatic requirements included creating a clean, contemporary aesthetic that enhances pedestrians’ wayfinding. Energy and maintenance reduction as well as long-term flexibility were equally essential. Rich, mahogany-toned wood and live bamboo planters balance the broad spans of warm white stone. A wood screen wall provides a visual separation and subtle wayfinding between the hotel and office lobbies.

The lighting design uses only LED lamp sources, with the exception of linear high performance T8 (HPT8) fluorescent wall washers and ceramic metal halide (CMH) adjustable heads for plant lighting. Square LED downlights with varying lumen output provide cohesion and exemplify the clean aesthetic of the space. After a mockup, 3000 K color temperature was selected to amplify the perception of warmth and comfort. The bamboo, however, required 4000 K to maximize growth, and the design team chose to use both color temperatures. This differential also allows the planters to pop. LED multi-head luminaires demarcate seating areas, while LED linear grazing and cove luminaires enhance the wood screen wall and heighten columns.

At the coffee kiosk, lower-lumen square downlights and LED edge-lit signage create a composition of elements. Continuing this theme, LED decorative-lensed downlights and mini LED cove lights are used in conjunction with wood paneling to wrap the escalators.

The lighting power density is less than 0.75 W/sq ft and beats IECC 2012 by more than 30%.

This project used a DALI-based intelligent control system, which was augmented with daylight and occupancy sensors. By providing an advanced lighting system, the project will not only save significant energy, but will minimize maintenance and increase flexibility and long-term functionality. The addressable nature of the selected control system enables the creation of various lighting scenes, which allows this multifunctional space to be used in several ways and enables the building owner to reprogram as needs change. During commissioning, this flexibility was used at several stages, modifying scenes and adjusting the light levels. In the long run, this system will serve to reduce energy while adding wayfinding, flexibility, and functionality.  



Shanna Olson is Senior Lighting Designer for KJWW Engineering Consultants. She is NCQLP certified and experienced in creating lighting designs for municipal, health care, educational, commercial, and residential clients. 

Consulting-Specifying Engineer's Product of the Year (POY) contest is the premier award for new products in the HVAC, fire, electrical, and...
Consulting-Specifying Engineer magazine is dedicated to encouraging and recognizing the most talented young individuals...
The MEP Giants program lists the top mechanical, electrical, plumbing, and fire protection engineering firms in the United States.
How to use IPD; 2017 Commissioning Giants; CFDs and harmonic mitigation; Eight steps to determine plumbing system requirements
2017 MEP Giants; Mergers and acquisitions report; ASHRAE 62.1; LEED v4 updates and tips; Understanding overcurrent protection
Integrating electrical and HVAC for energy efficiency; Mixed-use buildings; ASHRAE 90.4; Wireless fire alarms assessment and challenges
Power system design for high-performance buildings; mitigating arc flash hazards
Transformers; Electrical system design; Selecting and sizing transformers; Grounded and ungrounded system design, Paralleling generator systems
Commissioning electrical systems; Designing emergency and standby generator systems; VFDs in high-performance buildings
As brand protection manager for Eaton’s Electrical Sector, Tom Grace oversees counterfeit awareness...
Amara Rozgus is chief editor and content manager of Consulting-Specifier Engineer magazine.
IEEE power industry experts bring their combined experience in the electrical power industry...
Michael Heinsdorf, P.E., LEED AP, CDT is an Engineering Specification Writer at ARCOM MasterSpec.
Automation Engineer; Wood Group
System Integrator; Cross Integrated Systems Group
Fire & Life Safety Engineer; Technip USA Inc.
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
click me