High-pressure mercury vapour lamps. Performance specifications

2019 ◽  
Keyword(s):  
High Pressure ◽  
Mercury Vapour ◽  
Performance Specifications

Design of Solar-Powered LED Road Lighting System

2019 ◽  
pp. 75-85
Author(s):  
Canan Perdahci ◽  
Hamdi Ozkan
Keyword(s):  
High Pressure ◽  
Renewable Energy Sources ◽  
Junction Temperature ◽  
Mercury Vapour ◽  
Light Sources ◽  
Street Lighting ◽  
Led Light ◽  
Road Lighting ◽  
Lighting Systems ◽  
High Pressure Sodium Lamp

Turkey is rich in terms of renewable energy sources and, therefore, is now encouraging the use of sustainable clean lighting systems in road applications. High pressure sodium lamp is the most widely used type in main roads, but other types of lamps such as mercury vapour lamps or metal halide lamps can be utilized for street lighting. Since it enables energy and money saving, LED light technology has replaced high pressure sodium lamps nowadays. Once solar power system (PV) is integrated with LED lamp for street lighting, the amount of saving and local impact might be enriched. LEDs used as light sources in road lighting luminaires with rising lumen values, decreasing junction temperature, higher colour rendering efficiency, longer lifetime have become more efficient than many light sources with the latest developments. Since the structure of the luminaires in which the LED light sources are used differs from that of the conventional light sources, the optical, thermal and electrical design of the LED luminaires must be considered differently. Thus, this study concentrates upon design considerations and the operating principle of solarpowered LED road lighting luminaire in details. Also, a simple solar panel system was designed and the economical values obtained at the end of 20 years were compared when using the ongrid system and the off-grid system.

scholarly journals The formation of mercury molecules

1936 ◽  
Vol 153 (879) ◽  
pp. 359-378 ◽  
Keyword(s):  
High Pressure ◽  
Electron Impact ◽  
Emission Spectra ◽  
Mercury Vapour ◽  
Definite Evidence ◽  
Excited Atoms ◽  
Specific Heats ◽  
Vapour State ◽  
Vapour Density ◽  
Chemical Evidence

Mercury molecules in the vapour state have never been directly detected. The ratio of the specific heats and vapour density determinations all show that mercury vapour is strictly monatomic, so that so far as chemical evidence is concerned mercury vapour molecules do not exist. However, the occurrence of quite strong hands in the absorption and emission spectra of mercury vapour at high pressure demand the presence of molecules in considerable number. We have obtained definite evidence that diatomic molecules are formed in mercury vapour by the attachment of excited atoms to normal atoms. The formation of the molecules in this way clearly reconciles the chemical evidence of their non-existence with Ike hand spectra evidence of their presence; for, unless the atoms are excited by light or electron impact, the vapour may remain practically monatomic.

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