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The efficacy of a compact fluorescent lamp (FL) consisted of an outer bulb and two separated inner tubes was measured as a function of the coldest spot temperature. Optimum temperatures to obtain the maximum lumen output were 50•Ž and 55•Ž for inner tube diameters of 12.6mm and 9.4mm, respectively. The temperature of the inner tube surface was found to be 160•Ž for an inner tube diameter of 9.7mm at a room temperature of 16•Ž and a lamp power of 17 W. In Order to analyze these results, we made an additional experiment using a straight tube lamp, in which both temperatures of the coldest spot and the wall adjacent to the light emitting part can be controlled independently. The intensity of Hg 253.7nm radiation from a 9.5mm diameter tube had maximums at 49•Ž and 58•Ž for wall temperatures of 100•Ž and 350•Ž, respectively. From these results it has been concluded that the optimum temperature of this compact FL shifts to higher temperature because the density of mercury atoms inside the inner tubes decreases with the increase of an inner tube temperature.

Temperature Dependence of Efficacy of Fluorescent Lamp with two Separated Inner Tubes