| 摘要 |
A light device which includes a fluorescent lamp may be manually turned on by a switch or may be automatically turned on when a human body is approaching within a predetermined distance and environmental lightness is below a predetermined level. The light device includes a DC/AC converter which when triggered by an auxiliary DC voltage can output a high frequency AC voltage to turn on the fluorescent lamp. A relay which is normally open is connected between the auxiliary DC voltage and the DC/AC converter. A battery charging device includes a rechargable battery which is charged when the switch is turned on and provides the auxiliary voltage when the switch is turned off. A human body detecting device generates a human approaching indicative signal in response to a human body approaching in a predetermined distance. A light illumination detecting device detects environmental lightness and outputs a lightness insufficiency indicative signal when the environmental lightness is less than a predetermined level. A timer/driving device energizes the relay in response to the presence of the human approaching indicative signal and the lightness insufficiency indicative signal, thus triggering the DC/AC converter to output the high frequency AC voltage to turn on the fluorescent lamp.
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