Sodium lamp is an electric light source that produces visible light by sodium vapor discharge.Sodium lamp is divided into low-pressure sodium lamp and high-pressure sodium lamp.The working vapor pressure of low-pressure sodium lamp shall not exceed several pascals.The discharge radiation of low-voltage sodium lamp is concentrated on two double D spectral lines of 589.0 nm and 589.6 nm, which are very close to the highest value of human visual curve (555 nm), so its luminous efficiency is very high.The working vapor pressure of high-pressure sodium lamp is greater than 0.01 MPa.High pressure sodium lamp is developed for its strong monochromaticity, poor color rendering and long discharge tube.
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