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THE LOW-PRESSURE SODIUM LAMP. The LPS lamp was the first sodium lamp to be developed. It is known by its signature monochromatic yellow color.. The sodium vapor strikes an arc over 240 C. The sodium is mixed with other impurities to create a more “white” light. The mercury helps add a blue spectrum light to the pure yellow of the sodium.. Mercury vapor lamps, shown in Figure 6.3.8, are widely used to light both indoor and outdoor areas such as gymnasiums, factories, department stores, banks, highways, parks, and sports fields.. Low-pressure sodium lamps—producing up to 180 lumens per watt—have the highest efficacy of all commercially available lighting sources. A low.

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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 and argon gas and a little metallic sodium. When current passes between the electrodes, it ionizes the neon and argon, giving a…. Other articles where low-pressure sodium-vapour lamp is.. These appear to have been marketed as from 1968. On account of their superior efficacy, the SOX range was re-rated to new lower wattages, having approximately the same luminous flux. Lamp wattage was reduced to 35W, 55W, 90W, 135W and 180W. Technical specifications for Re-Rated SOX are given in Table S5.