Article View: sci.electronics
Article #3771Re: Fluorescent light ballasts
From: Richard S D'Ippolito
Date: Fri, 17 Nov 1989 15:07
Date: Fri, 17 Nov 1989 15:07
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In article <22334@gryphon.COM> richard@gryphon.COM (Richard Sexton) writes: =There are two kinds of ballasts: magnetic and elecronic. The =former is by far the most common type, and is little more than =a transformer. It is cheap to puchase. It has the drawbacks =of being noisy (this is the source of the humm, or buzzing =so often ascociated with fluorescent lights) and not =terribly energt [sic] efficient. A fixture with two 40 watt bulbs =may actually draw 250 watts. Twentyfive years ago, when I did lighting design, the typical transformer ballasts for two 40W tubes consumed less than 20W, making the total fixture demand less than 100W. I know this because I also had to calculate the air-conditioning load. What are you talking about?! Is this some hype from an electronic ballast manufacturer? Rich -- When you can measure what you are speaking about, and express it in numbers, you know something about it. Lord Kelvin rsd@sei.cmu.edu -----------------------------------------------------------------------------
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arc1-ca.pugleaf.net!utzoo!attcan!uunet!aplcen!uakari.primate.wisc.edu!gem.mps.ohio-state.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!sei!rsdReferences:
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!aplcen!uakari.primate.wisc.edu!gem.mps.ohio-state.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!sei!rsd From: rsd@sei.cmu.edu (Richard S D'Ippolito) Newsgroups: sci.electronics Subject: Re: Fluorescent light ballasts Keywords: advance Message-ID: <4995@ae.sei.cmu.edu> Date: 17 Nov 89 15:07:36 GMT References: <22334@gryphon.COM> Reply-To: rsd@sei.cmu.edu (Richard S D'Ippolito) Organization: Software Engineering Institute, Pittsburgh, PA Lines: 24