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Jean-Jacques Meyer Visual Discomfort: Evaluation After Introducing Modulated Light Equipment David Francioli Paule Rey Laboratoire d'ergonomie de la vision, Faculté de Médicine, Université de Genève, Switzerland Frédéric Benoît Bonnard et Gardel, Ingénieurs - conseils, Lausanne, Switzerland Summary A new discomfort J index was applied to check for acceptable eye discomfort, when introducing into an office a more economical equipment, aimed to modulate the amount of fluorescent lighting, as a function of natural illumination. The energy saving was measured for different combinations of light sources. Measurements of luminances and lighting levels were performed at the workplace at various moments: sunny day, overcast sky, with or without artificial lighting and in all possible directions of the eye (scanning method). With the J discomfort index, it was shown, that the new regulated system was able to reduce energy expenditure without enhancing visual discomfort.
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