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Apparently incandescent lamps don't output the wavelength of light that excites the solar cell. Halogen lamps are also incandescent, the halide gas makes the filament redeposit back if it vaporizes off. The spiral twist florescent worked extremely well/fast. Trig

I have found that a standard 100 Watt spiral twist light bulb, the kind that screws into a socket, charges my G-Shock watches well. I use the light bulb in a portable spot light holder that has a clamp on base. Clamp it to a table and shine the light about 6 inches from the watch face. The...