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Lighting Research and Technology
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Modulation of light from fluorescent lamps

A.J. Wilkins, BSc DPhil

Medical Research Council Applied Psychology Unit, 15 Chaucer Road, Cambridge CB2 2EF

C. Clark

Medical Research Council Applied Psychology Unit, 15 Chaucer Road, Cambridge CB2 2EF

The temporal modulation of light from halophosphate, triphosphor and multiband fluorescent lamps (controlled by a conventional choke circuit) was measured as a function of wavelength. Within each category, all lamps had similar functions for peak-peak modulation. At the short-wavelength end of the visible spectrum all lamps showed a modulation near 100%. Halophosphate and multiband lamps had a low modulation at the long-wavelength end of the spectrum and gave the lowest overall modulation. Certain deluxe lamps had a modulation greater than 80% throughout the spectrum. The modulation of photopic energy, and energy transduced by the photoreceptors was calculated. Triphosphor lamps gave greater modulation than halophosphate, the lowest modulation being from warm-white halophosphate lamps.

Lighting Research and Technology, Vol. 22, No. 2, 103-109 (1990)
DOI: 10.1177/096032719002200205
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