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I am the inventor of the FL–41 lens that features in the article. As the authors point out, the original design of the lens was an attempt to reduce the flicker from fluorescent lamps in the days when most were operated from magnetic circuitry. The lamps then had a halophosphate coating, a phosphor that converted the ultraviolet radiation from the gas discharge to long wavelength light. The coating continued to emit light after excitation by the discharge and, as a result, the light from the lamps flickered mainly at the short wavelength end of the visible spectrum. The gas discharge occurred twice with each cycle of the alternating current (AC) electricity supply. This (100 Hz) flicker was too fast to be seen, but was shown to be responsible for headaches in office workers in a double-masked study that compared magnetic circuitry with electronic circuitry that reduced the 100 Hz flicker.

Response to “Optical Lens Tinting—A Review of its Functional Mechanism, Efficacy, and Applications”