| 摘要 |
At the lumen output levels of most ordinary household incandescent lamps, incandescent filaments designed for and operated at about 24 Volt RMS provide substantially higher luminous efficacy than filaments designed for and operated at 120 Volt RMS. A table lamp comprises means for converting 120 Volt/60 Hz to 120 Volt/30 kHz. The 120 Volt/60 Hz is obtained from an ordinary electrical receptacle; the 120 Volt/30 kHz is provided to the lamp socket. With 120 Volt/30 kHz on the lamp socket, any ordinary 120 Volt incandescent lamp can be used therein; as can also any special incandescent lamp having a 24 Volt filament in combination with a built-in 30 kHz voltage transformer operative to convert the 120 Volt/30 kHz socket voltage into 24 Volt/30 kHz voltage for the filament. While the size of a 60 Hz transformer capable of efficiently transforming the amount of power required by the 24 Volt filament would be far too large to be contained within a light bulb of ordinary dimensions; the size of a corresponding 30 kHz transformer is small enough to fit comfortably within the dimensions of an ordinary light bulb.
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