| 摘要 |
An improved incandescent light bulb which is capable of affording increased light efficiency without a resultant increase in either cost or energy consumption. In one embodiment of the bulb, said bulb includes a refractory stiff supporting element, at least one elongated helical resistive filament, two terminals which are each capable of being physically and electrically connected to a different socket and an elongated light transmissive envelope. In another embodiment the bulb additionally includes a reflector bonded to the envelope which reflects light and conducts heat away from said envelope. The stiff supporting element is formed to have a hollow interior. In said hollow interior a magnetizable elongated slug and two holding magnets may be contained. The slug and holding magnets cooperate with a switching means in the interior of the envelope to allow the bulb to selectively emit either a bright or a dim light.
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