Depending on the QL-3 model, the voltage across the filament is being limited, resulting in less consumed wattage and longer life. The SIDAC microchip fine-tunes the reduced input voltage so that the human eye can not see a difference in visible light levels. Studies by the Rensselaer Polytechnic Institute have proven that the detection threshold for reduced light level is @ 80% of the initial luminance level.

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