| 11. | Incandescent lamps were primarily used for street lighting until the advent of high-intensity discharge lamps.
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| 12. | Some gas-discharge lamps also have a perceivable start-up time to achieve their full light output.
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| 13. | Intensity control was provided via a mechanical shutter ( the discharge lamp being non-dimmable ).
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| 14. | Note that contemporary high intensity discharge lamps tend to use non-evaporable getters rather than flash getters.
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| 15. | Still, due to their greater efficiency, gas-discharge lamps are replacing incandescent lights in many lighting applications.
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| 16. | They may be as complex as the electronic ballasts used in fluorescent lamps and high-intensity discharge lamps.
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| 17. | A "'discharge lamp "'has a glass or silica envelope containing two metal electrodes separated by a gas.
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| 18. | High intensity discharge lamps have typical luminaire efficiencies of 55 %, and fluorescent lamps of 70 %.
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| 19. | High-intensity discharge lamps ( HID ) produce light with an electric arc rather than a glowing filament.
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| 20. | Sets of three high-intensity discharge lamps in the colors red, green and blue are mounted on the main cables.
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