Modulation of light from fluorescent lamps

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Abstract
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.