Pittsburgh City Council on Tuesday unanimously approved spending $2.2 million to study converting the city’s existing high-pressure sodium lights with more energy-efficient LED lights. Kim Lucas ...

“Based on the usage and maintenance rates of high-pressure sodium fixtures and those of LED, the city will save $6,770.57 per month or $81,246.84 per year” after the conversion, staff said ...

BUFFALO, N.Y. — Travel deep enough below Earth’s surface or inside the center of the Sun, and matter changes on an atomic level. The mounting pressure within stars and planets can cause metals to ...

A problem too often overlooked is how the yellow-tinted light of high-pressure sodium (HPS) fixtures, which are typically found lighting streets and some parking lots, impacts your perception of ...

City Council President Sam O'Leary said half of the grant will be used to transition the commercial corridors of Madison and Detroit avenues from high-pressure sodium to LED lighting.

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Don Bennett, a city traffic engineer, said the LED lights are expected to save more than $200,000 on the city's annual electric bill because the city doesn't have to generate electricity to run the ...

For almost two generations of Chicagoans, orange has been the color of night. High pressure sodium vapor lights, which create a glow reminiscent of a tire fire, have lit Chicago since the 1970s. Th… ...

Pittsburgh officials are considering moving ahead with a plan to convert the city’s streetlights to LED lights. City Council gave preliminary approval Wednesday to pay The Efficiency Network ...

A new study has revealed the chemical bonding behind sodium's high-pressure transformation from shiny metal to transparent insulator.