Like in a Metal Halide lamp, the working principle of a Sodium Vapour lamp is that of a discharge tube, but in this case, the discharge takes place through a tube with a small quantity of sodium-neon-argon (SOX lamp) or mercury-sodium amalgam (SON lamp). Unfortunately, It has very limited colour rendering properties, as it produces monochromatic deep yellow colour light only. Of the two versions, the SOX is more efficient, but the SON lamp has found better acceptance as it has slightly better colour rendition properties.
Due to the long life, efficient energy usage and excellent vision, the sodium vapour lamps are the ideal choice for road lighting. They are also suitable for monument illumination, particularly those made of stone masonry of orange hue.
Since these lamps produce monochromatic colour, they are unsuitable for indoor applications. However they find continued patronage among environmentally sensitive users, due to their efficiency and long life.
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