Additionally, 230 150W HID streetlights were replaced with
dimmable 85W LED versions and over 300 locations received
bi-level LED wall-pack fixtures that can switch between 52 and
26W. The inclusion of both LED and induction provided an easy
comparison for university staff.
“In some cases, what we were trying to do at the time was to
determine the best way to move forward. Our electrical engi-
neer was really favoring induction lighting and we in the energy
department were strongly looking at LED,” explains Testoni. “We
wanted to do a pilot to see which one would deliver more efficient
lighting, decreased maintenance costs, and a longer lifetime.”
University of California, Davis faced a similar decision when
they decided to roll out an exterior lighting retrofit covering 70%
of the campus’s pedestrian paths, bike lanes, and roadways. About
1,200 street and area lights, 100 decorative post-top luminaires,
and 100 wall-packs were replaced in 2011 and 2012, most of them
with LED products. The post-top retrofits involved 45W light
engines with zero to 10-volt dimming, while the HID wall-packs
were replaced with LED versions that use 14W in low mode and
45W in high mode – less than a third of the HID luminaires’ con-
sumption. Completed in 2012, the $950,000 project saves roughly
1,000 MWh and $100,000 a year.
UC Davis originally planned to use induction lighting to replace
high pressure sodium pole mounts in their parking lots, but opted
to try LED instead.
“The problem was that the induction lights were huge devices.
A lot of the poles have four heads and they started to look like
umbrellas – they were just huge,” explains Scott Arntzen, senior
project manager for design and construction management at UC
Davis. “We were looking for something with a smaller footprint.
The product we ended up going with has a dimmable driver –
Additionally, the new LED lights provided significantly better
color rendering over their high pressure sodium predecessors,
Arntzen adds. This feature also appealed to Presence Saint Fran-
cis Hospital, an Evanston, IL-based Level 1 trauma center with
24/7 traffic. Its parking garage featured yellow high-pressure
sodium fixtures that just didn’t pass muster.