Ads
related to: high pressure sodium street light
Search results
Results From The WOW.Com Content Network
A high-pressure sodium street light in Toronto A high-pressure sodium-vapor lamp An HPS lamp that isn't entirely off. A sodium-vapor lamp is a gas-discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm. Two varieties of such lamps exist: low pressure and high pressure.
When the availability of high-pressure sodium vapor lamps coincided with the rise of social unrest in the mid-1960s, lamp manufacturers once again promoted the potential for sodium vapor lighting to enable better street surveillance. [1] High-pressure sodium lamps produced a distinct "yellow/orangeish light", [14] brighter than mercury vapor ...
High pressure sodium lamps, producing up to 150 lumens per watt produce a broader light spectrum than the low pressure sodium lamps. Also used for street lighting, and for artificial photoassimilation for growing plants High pressure mercury-vapor lamps are the oldest high pressure lamp type and have been replaced in most applications by metal ...
Penelec, a subsidiary of FirstEnergy (FE), installs more than 2,300 smart LED streetlights replacing old high-pressure sodium lamps. It is part of an endeavor to convert Erie into a smart city.
Low-pressure sodium-vapor lamps are extremely efficient. They produce a deep yellow-orange light and have an effective CRI of nearly zero; items viewed under their light appear monochromatic. This makes them particularly effective as photographic safelights. High-pressure sodium lamps tend to produce a much whiter light, but still with a ...
While most high-mast lights are high-pressure sodium, other lamp types such as mercury vapor, metal halide and LED, have also been used. Some units have the lighting surrounded by a circular shield to prevent or reduce light pollution or light trespass from affecting neighborhoods adjacent to the highway.