THE BUILDING’S EXTERIOR GLASS WALL is shielded from daylight by 40-foot-
tall aluminum louvers that rotate with the sun.
ON FIRST BLUSH, THE 98,000- SQUARE-FOOT CARL ICAHN LABORATORY AT PRINCETON UNIVERSITY did not seem to be a cost-competitive candidate for a lighting upgrade, despite its
annual lighting energy consumption of 564,000 k Wh at
$50,000. The labor cost of fixture removal and replacement
seemed too high, and based on previous experience on
campus, lab users considered simple on/off occupancy controls to be a nuisance and regularly disabled them.
Lighting in the lab and office spaces utilized 815 2-by-
2-foot recessed luminaires, each with two 31-watt T8
U-lamps. The luminaires were outfitted with acrylic prismatic lens, and drew 50 watts each over an estimated 5,000
operating hours per year. At 240,425 k Wh annually, the lab
[LIGHTING UPGRADES BY THE NUMBERS]
Princeton Lab Reaps Payback on LED Units
and office lighting accounted for 43% of the facility’s annual
lighting energy.
The upgrade solution installed in the lab/office spaces
consisted pan-type retrofit kits from Maxlite, a product on
the DesignLights Consortium’s Qualified Products List. These
units produce 3,315 lumens and draw 45 watts each. They
have a minimum CRI of 82 and CCT of 4,100K.
The control/energy management solution for these
spaces consisted of a Lutron Quantum Ecosystem with wireless motion and daylight sensors, wireless dimmer switches,
and bi-level dimming capability in lab areas. Illuminance is
varied along the lab counters from the window wall to the
inside wall.
Before controls, the lab/office lighting replacement has
yielded 57,000 k Wh in annual energy savings.
CASE SOURCE: “HIGH PERFORMANCE TROFFER LIGH TING SOLU TIONS,” A PRESENTATION AT THE DEPAR TMEN T OF ENERGY’S 2015 BE T TER BUILDINGS SUMMI T
LUMINAIRES IN THE LAB and office areas were retrofit-ted with pan-type LED units.
