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Luminous build-up characteristics of a compact fluorescent lamp with two separated inner tubes have been studied. In this structure, the temperature of the outer bulb, which determines mercury vapor density in the inner tubes, rises gradually after ignition. As a result, the time in which luminous flux reaches a sufficiently high value` is relatively long. It has been found that this luminous build-up is improved by setting silver ribbons near the electrodes. Mercury atoms adsorbed on silver ribbons evaporate since the silver ribbons are heated by radiation from filaments. This results in a rapid increase of the luminous flux after ignition. The surface area of silver necessary for improvement of the luminous build-up has been found to be about 0. 5-v1 cm2 from the measurement of the amount of mercury adsorbed on silved ribbons.

Luminous Build-up Characteristics of a Compact Fluorescent Lamp with Two Ieparated Inner Tubes