Combination incandescent and solar-electric light bulb with auto

Details Combination incandescent and solar-electric light bulb with auto Combination incandescent and solar-electric light bulb with auto

1987-07-15

1990-04-17

Moore, David K.

Electric lamp and discharge devices: systems

Automatic substitution of the power supply

With load device or electrode substitution

315 86, 315151, 362183, 362184, H05B 3910

Patent

active

049183575

ABSTRACT:
A dual-filament light bulb with associated adapter apparatus which uses photovoltaic cells mounted within the light bulb to charge a battery which powers one of the filaments. The adapter apparatus is designed to mount in an ordinary light socket which provides external current to the other filament. The adapter apparatus includes circuitry which alternately switches from the filament powered by the battery to the filament powered by external current in a manner which reduces the amount of electricity needed to produce a given amount of light.

REFERENCES:
patent: 2067653 (1937-01-01), Witmer et al.
patent: 3324304 (1967-06-01), Duncan
patent: 4441143 (1984-04-01), Richardson

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