Results 1 - 24 of 48 - Apollo Horticulture GLBHPS - Watt High Pressure Sodium HPS Grow Ultra Sun High Pressure Sodium Lamp, watt. Jump to HPS Lamps - High Pressure Sodium Lamp (HPS Lamp) -Can be retrofitted into older Mercury Vapor fixtures -Better bulb life than LPS lamps. A low-pressure sodium-vapour (LPS) lamp contains an inner discharge tube made of borosilicate glass that is fitted with metal electrodes and filled with neon.
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Unfortunately, our editorial approach may not be able to accommodate all contributions. Where sodium vapor lights are the source of urban illumination, the night sky is tinged with orange.
The Sodium Lamp - How it works and history
Film special effects[ edit ] This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. December Learn how and when to remove this template message Sodium vapor process occasionally referred to as yellowscreen is a film high pressure sodium vapor lamp that relies on narrowband characteristics of LPS lamp.
Color negative film is typically not sensitive to the yellow light from an LPS lamp, but special black-and-white film is able to record it.
High-pressure sodium vapor lamps for open and enclosed luminaires | Products
Using a special camera, scenes are recorded on two spools simultaneously, one high pressure sodium vapor lamp actors or other foreground objects and another that becomes a mask for later combination with different background.
This technique originally yielded results superior to blue-screen technology, and was used in years tomostly by Disney Studios. Later advancements in blue- and green-screen techniques and computer imagery closed that gap, leaving SVP economically impractical.
High-pressure sodium[ edit ] High-pressure sodium lamp in operation Spectrum of high-pressure sodium lamp. The yellow-red band on the left is the atomic sodium D-line emission; the turquoise line high pressure sodium vapor lamp a sodium line that is otherwise quite weak in a low pressure discharge, but becomes intense in a high-pressure discharge.
Most of the other green, blue, and violet lines arise from mercury.
Diagram showing the spectral output of a typical high-pressure sodium HPS lamp. Office building illuminated by high-pressure sodium lamps. Understanding the change in human color vision sensitivity from photopic to mesopic and scotopic is essential for proper planning when designing lighting for roadways.
Some higher-power lamps e.
High-pressure sodium vapor lamps for open and enclosed luminaires | OSRAM DS
Since the high-pressure sodium arc high pressure sodium vapor lamp extremely chemically reactive, the arc tube is typically made of translucent aluminum oxide. This construction led the General Electric Company to use the tradename "Lucalox" for its line of high-pressure sodium lamps.
Xenon at a low pressure is used as a "starter gas" in the HPS lamp. It has the lowest thermal conductivity and lowest ionization potential of all the stable noble gases.
As a high pressure sodium vapor lamp gas, it does not interfere with the chemical reactions occurring in the operating lamp. The low thermal conductivity minimizes thermal losses in the lamp while in the operating state, and the low ionization potential causes the breakdown voltage of the gas to be relatively low in the cold state, which allows the lamp to be easily started.
However, white SON lamps have higher cost, shorter service lives, and lower light efficiency, and so they cannot compete with HPS at high pressure sodium vapor lamp time.
Theory of operation[ edit ] This section does not cite any sources. December Learn how and when to remove this template message Diagram of a high-pressure sodium lamp.