Download PDF by Paloma Carden: Advances In Energy Conservation

By Paloma Carden

ISBN-10: 9381157375

ISBN-13: 9789381157374

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As has been noted above, Edison used calcium tungstate for his unsuccessful lamp. Other efforts had been mounted, but all were plagued by low efficiency and various technical problems. Of particular importance was the invention in 1927 of a low-voltage “metal vapor lamp” by Friedrich Meyer, Hans-Joachim Spanner, and Edmund Germer, who were employees of a German firm in Berlin. A German patent was granted but the lamp never went into commercial production. Commercialization of fluorescent lamps All the major features of fluorescent lighting were in place at the end of the 1920s.

The spectrum of light emitted from a fluorescent lamp is the combination of light directly emitted by the mercury vapor, and light emitted by the phosphorescent coating. The spectral lines from the mercury emission and the phosphorescence effect give a combined spectral distribution of light that is different from those produced by incandescent sources. The relative intensity of light emitted in each narrow band of wavelengths over the visible spectrum is in different proportions compared to that of an incandescent source.

Later other compounds were discovered, allowing differing colors of lamps to be made. Electrical aspects of operation Different ballasts for fluorescent and discharge lamps Fluorescent lamps are negative differential resistance devices, so as more current flows through them, the electrical resistance of the fluorescent lamp drops, allowing even more current to flow. Connected directly to a constant-voltage power supply, a fluorescent lamp would rapidly self-destruct due to the uncontrolled current flow.

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Advances In Energy Conservation by Paloma Carden

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