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A fluorescent light bulb, with a power of 100 W, lights up in air at 258C...

A fluorescent light bulb, with a power of 100 W, lights up in air at 258C and atmospheric pressure. Under these conditions, the temperature of the glass surface is 140 ° C. Determine the heat transfer rate of the bulb by natural convection. The bulb is cylindrical, with a diameter of 35 mm and a length of 0.8 m and is horizontally oriented. Please note that if your result is not equal to 100W. Where's the remaining energy?
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