/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur.Lighting Research & Technology, 23, 3, pp. 135-144, 1991-09-01 Relative visual performance : a basis for application Rea, M. S.; Ouellette, M. J.
/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur.Lighting Research and Technology, 20, 4, pp. 139-153, 1988 Visual performance using reaction times Rea, M. S.; Ouellette, M. J.
This paper describes a performance evaluation of ten compact fluorescent lighting systems operated with sinusoidal and distorted voltage waveform conditions. The lamps were either provided with an electronic ballast, a magnetic core ballast or a magnetic core ballast with a power factor correction circuii The test results show that the eleceical performance of
/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at
/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Society, 17, 1, pp. 29-35, 1988 Journal of the Illuminating Engineering IntroductionHigh intensity discharge (HID) lamps are widely used for both indoor and outdoor applications, primarily because of their high luminous efficacy The two most common types of HID lamp now specified in North America are high-pressure sodium (HPS) and metal halide (MH). In general, HID lamp choice will depend upon the importance of good color rendering relative to high luminous efficiency. The choice of the "orange" or "gold" HPS lamp generally represents an emphasis on energy conservation, whereas choice of the "white" MH lamp generally represents an emphasis on color rendering.Flicker is another factor that is important but sometimes ignored in the choice of HID lamp type. Although HPS and MH lamps do not usually appear to flicker with 60-Hz alternating current, they do indeed vary, in different degrees, in their luminous output. Frier and Henderson' discuss the physical characteristics of the luminous modulation or flicker of HPS and MH lamps. Following calculation methods presented by Eastman and Campbell,2 Frier and Henderson presented measurements of flicker index and percentage of flicker from HPS and MH lamps. They observed that with either calculation method HPS lamps flicker more and MH lamps flicker less than most HID lamps.Frier and Henderson also describe the stroboscopic effect whereby objects appear to move discretely rather than continuously under flickering illumination. This effect depends upon the rate and amplitude of modulation as well as on the sensitivity of the observer to flicker. Their observations of a controlled, rotating table-tennis ball under different HID sources indicated that the stroboscopic effect was, not surprisingly, more noticeable under HPS than under MH. They also observed that the effect was largest when the ball moved across a large portion of the visual field; small angular movement produced minimal effect.Based upon these observations, Frier and Henderson proposed that player performance at, say, tabletennis should not be seriously affected under lights
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