LED streetlights to take over downtown Ann Arbor

From LED magazine

17 Oct 2007

Ann Arbor plans to become the first US city to convert 100 percent of its downtown streetlights to LED technology, with the installation of more than 1000 LED fixtures.

LED maker Cree and the City of Ann Arbor, Michigan, have announced that Ann Arbor will join Raleigh, North Carolina and Toronto, Canada, in the growing LED City initiative.

In an effort to reduce greenhouse gas emissions and energy consumption, Ann Arbor plans to become the first U.S. city to convert 100 percent of its downtown streetlights to LED technology.

Ann Arbor expects to install more than 1,000 LED streetlights beginning next month, after a successful trial of 25 fixtures. The City anticipates a 3.8-year payback on its initial investment. Each LED fixture draws 56 watts and is projected to last 10 years, replacing fixtures with bulbs that use more than 120 watts and last only two years.

“This decision is based on three years of extensive research on the energy and maintenance savings associated with LED lighting, citizen surveys and a very successful pilot of 25 LED lights spanning an entire city block,” said Mayor John Hieftje.

As a result, the City received a $630,000 grant from the Ann Arbor Downtown Development Authority to fund retrofits for the downtown lights. “This initial installation should save the City more than $100,000 per year and reduce annual greenhouse gas emissions by approximately 294 tons of CO2. Our plan is to retrofit all downtown lights with LED alternatives over the next two years.”

Full implementation of LEDs is projected to cut Ann Arbor’s public lighting energy use in half and reduce greenhouse gas emissions by 2,425 tons of CO2 annually, the equivalent of taking 400 cars off the road for a year. Detroit Edison, Ann Arbor’s local utility provider, will meter the new LED streetlights with the intent to gather sufficient information to develop new LED-based tariffs.

The LED streetlights currently installed in Ann Arbor are based on the New Westminster Series made by Lumec, Inc., which contain LED light engines from Relume Technologies, Inc. In turn, the Relume light engines contains Cree XLamp LEDs.

LEDs lights to span the Hudson River

25 Sep 2007

LEDs will replace conventional lighting on the George Washington bridge and the Holland Tunnel.

According to an article on the Star-Ledger news website, two Hudson River crossings linking New Jersey and New York City will be fitted with LED lights.

The plans to retrofit conventional lamps with energy-saving LED illumination on the George Washington bridge and the Holland Tunnel were approved by the Port Authority of New York and New Jersey's board of commissioners.

A $4.5 million project eventually will replace more than 4,200 fluorescent fixtures at the Holland Tunnel with 1,736 LED fixtures. The new lamps will last 15 years, compared with the roughly 18-month life span of the existing lights, providing an estimated annual saving of $340,000, says the article.

The George Washington bridge will see a one-for-one replacement of 156 mercury vapor lamps on the bridge's cables. The $200,000 project will results in annual savings of $50,000.

The current fixtures, which provide aesthetics and do not light the roadway, must be replaced as often as each year. Agency officials also are considering converting the roadway lights, says the newspaper article.

Both projects are annually expected to reduce carbon dioxide emissions by more than 3.3 million pounds and nitrogen oxides by 5,000 pounds. Work on the bridge and the tunnel is slated to start and finish in 2008.

Article courtesy LED magazine