Following the economic imperative to use the most cost-effective lighting—high-pressure sodium lights consume half as much energy as mercury-vapor lamps and can last up to 16,000 hours longer ...

In December the Tribune reported that his plan would make Chicago "the first large U.S. city to have sodium vapor lamps on all residential streets"—plausible, given how new the technology was ...

Mercury vapor lamps declined 9.6% to an index value of 44 signifying that shipments during 2012 were 44% of the 2006 base level. The index for sodium vapor lamp shipments fell 6.2%, landing at 75.

“Having brighter light is always going to be more beneficial as far as getting truer colors. The issue becomes that there’s been character that is lost when you switch away from the sodium ...

A commercial application has been found for the extremely efficient sodium-vapor lamp. A highway in Holland is now illuminated with these light units giving off an intense yellow glow; and this ...

The new fixtures also include a welcome side benefit. Instead of the orange glow of the sodium vapor lamp, metal halide lamps produce a more pleasing to the eye, bright white light. "It’s all ...

But the sodium also absorbs at that wavelength. Tretiakov placed a sodium vapor lamp next to the beaker, and the flames absorbed that light, becoming an eerie black to our eyes.