ナトリウム蒸気ランプは、励起状態のナトリウムを用いて光を発生させるガス放電ランプである。 このようなランプには、低圧と高圧の2種類があります。 低圧ナトリウムランプは、高効率の電気光源ですが、黄色の光は、街路灯などの屋外照明にアプリケーションを制限します。 高圧ナトリウムランプは、低圧より広いスペクトルの光を有するが、他のタイプのランプよりもなお貧弱な演色性を有する。 低圧ナトリウムランプは単色の黄色光しか出さないため、夜間の色覚を抑制します。 ナトリウム蒸気ランプは水銀蒸気ランプに比べて光汚染が少ないため、多くの天文台がある都市で使用されています。 A sodium-vapor lamp is a gas-discharge lamp that uses sodium in an excited state to produce light. There are two varieties of such lamps: low pressure and high pressure. Low-pressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor lighting such as street lamps. High-pressure sodium lamps have a broader spectrum of light than the low pressure, but still poorer color rendering than other types of lamps. Low-pressure sodium lamps only give monochromatic yellow light and so inhibit color vision at night. Because sodium-vapor lamps cause less light pollution than mercury-vapor lamps, many cities that have large astronomical observatories employ them.
If a diffusing coating is added to a sodium-vapor lamp, the entire glass envelope
becomes the light- emitting source. This reduces lamp luminance, and therefore
glare potential, drastically but also reduces output (and efficacy) by 6% to 8%.
Walter T. Grondzik, Alison G. Kwok, Ben Stein, 2011
2
Sodium-VaporLamp
High Quality Content by WIKIPEDIA articles! A sodium vapor lamp is a gas discharge lamp that uses sodium in an excited state to produce light. There are two varieties of such lamps: low pressure and high pressure.
Jesse Russell, Ronald Cohn, 2012
3
Concepts of Classical Optics
Fig. 5-14 shows Professor Wood's set-up to demonstrate such strong scattering
by sodium' vapor near (.00. The large evacuated glass capsule shown contains
metallic sodium. The light from a sodium vapor lamp is focused Within the
capsule.
John Strong, 2012
4
Developments and Changes in Science Based Technologies
An outer glass vacuum envelope for thermal insulation, improves the efficiency of
sodium vapor lamp. Afurther improvement, in sodium vapor lamp was attained by
coating the glass envelope with an infrared reflecting layer composed of ...
P. Mathur/K. Mathur/S. Mathur, 2014
5
Generation and Utilization of Electrical Energy
20. Sodium vapor lamp needs an ionization voltage of about: (a) 5 V. (b) 20 V. (c)
50 V. (d) 100 V. 21. The ignition voltage for a sodium lamp is about: (a) 100-125
V. (b) 200-240 V. (c) 300-400 V. (d) 400-600 V. 22. When a sodium vapor lamp ...
S. Sivanagaraju, 2010
6
Energy Conservation Guidebook
... the most 89.0mm 3.50a Nominal Diameter proper and pleasing lighting at the.
Figure 6-9. Application of mercury-vapor lighting. (Courtesy of Philips Lighting
Corp.) Figure 6-10. Sodium-vapor lamp. (Courtesy of Philips Lighting Corp.)
Figure.
Steven R. Patrick, Dale R. Patrick, Stephen W. Fardo, 1993
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A Sodium vapor lamp is a gas discharge lamp which uses sodium in an excited state to produce light.
Lambert M. Surhone, Miriam T. Timpledon, Susan F. Marseken, 2010
8
Fundamentals of Solid-State Lighting: LEDs, OLEDs, and Their ...
Low-pressure sodium vapor lamp was invented in 1919 by Arthur Holly Compton
(1892–1962) of Westinghouse Electric in the United States. General Electric (GE)
first developed the high-pressure sodium lamp in Schenectady (New York) and ...
Vinod Kumar Khanna, 2014
9
Marijuana Grower's Handbook: The Indoor High Yield Guide
In another unpublished controlled experiment, a metal halide lamp and a sodiumvapor lamp were used as the only sources of light in 2 different systems. The
garden under the metal halide matured about a week faster than the garden
under ...
Ed Rosenthal, 1998
10
Intrusion Detection Systems
This accounts for the golden white color of the high- pressure sodium vapor lamp.
Low-pressure sodium discharge lamps produce light by passing the arc through
the vaporized sodium. The light produced by the low-pressure sodium arc is ...
LED Streetlights in Brooklyn Are Saving Energy but Exhausting …
To some residents, the new lights make it feel as though a construction or film ... The orange haze of sodium-vapor lamps will be gone from the nighttime city, ... «New York Times, 3月 15»
2
NPR switching to LED streetlights
Duke Energy crews continue to swap out the old sodium-vapor lamps that have illuminated the city's streets for decades. The utility maintains the street light ... «Suncoast News, 12月 14»
3
Chris Hadfield shows effects of Germany's East-West division in …
In East Berlin, there are "sodium-vapor lamps" that have a yellower color, while West Berlin has fluorescent lamps, which emit a whiter color, a spokesperson for ... «Mashable, 11月 14»
4
Finned LED streetlights go for flashy look
Cree is leaning on high design to get LED lighting onto lamp posts. .... Actually sodium-vapor lamps are significantly more efficient than LED (in terms of power ... «CNET, 4月 12»
5
Shot in Tijuana: The Lamplighters
During the street's renovation a few years back, many of TJ's street lamps were ... #A worker up in a “cherry-picker” installs a sodium-vapor lamp into one of the ... «San Diego Reader, 1月 12»
