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Metal halides are used in high-intensity discharge light bulbs, such as in modern street lights, because they are more energy- efficient than mercury vapour bulbs, and have much better colour renditionA rendition is an interpretation of a musical score or a performance of a musical work. than orangeSee also Orange for other meanings of the word. The colour orange occurs between red and yellow in the visible spectrum at a wavelength of about 620-585 nanometres. It is the same colour as the fruit for which it was named. With natural colouring material high- pressurePressure (symbol: p is a measure of force per unit area. where p is the pressure F is the force A is the area Often F is taken to be the of the magnitude of the mean vector force normal to the surface of area A upon which it exerts; the "surface" not nece sodiumSodium is the chemical element in the periodic table that has the symbol Na Natrium in Latin) and atom number 11. Sodium is a soft, waxy, silvery reactive metal belonging to the alkali metals that is abundant in natural compounds (especially halite). bulbs.