lec12 - Electric lighting Light emission incandescence vs....

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Electric lighting Light emission ± incandescence vs. luminescence Lamp types ± Incandescent (classic, halogen) ± Discharge (fluorescent tubes) ± Electrodeless (induction-based) 8 Natural light 7 Low pressure sodium 6 High pressure sodium 5 Mercury vapor 4 Fluorescence 3 Metal halide 2 Halogen 1 Classic incandescent Figure by MIT OCW. 200 160 180 140 120 100 80 60 40 20 0 } 1 2 3 4 5 6 7 8 Incandescent lamps Discharge Natural light lm/W
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Electric lighting Incandescent lamps (color °T = 2500 °K) ± Classic incandescence ­ 15 to 500 W ­ 6 to 17 lm/W
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Electric lighting Incandescent lamps (color °T = 2500 °K) ± Classic incandescence ± Halogen incandescence ­ 25 to 2000 W ­ 10 to 22 lm/W
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Electric lighting Incandescent lamps Discharge lamps ± Fluorescent tubes ­ 18, 36 or 58 W ­ 53 to 89 lm/W ­ color °T between 3000 - - + Point of Impact Path of Conduction Electron Valence Electron After Impact Ultraviolet Radiation Phosphor Crystals Visible Light Electron Cloud of Single Mercury Atom Lamp Bulb Wall Figure by MIT OCW. and 6000 °K ­ poor to pretty good color rendering
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Electric lighting Incandescent lamps Discharge lamps ± Fluorescent tubes ± Compact fluorescents ­ 3 to 23 W ­ 33 to 65 lm/W ­ 3000 to 3500 °K ­ pretty good color rendering
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This note was uploaded on 12/05/2009 for the course COA 4403 taught by Professor Test during the Spring '09 term at Georgia Tech.

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lec12 - Electric lighting Light emission incandescence vs....

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