| 摘要 |
A halogen torchiere lamp comprises a grid-like guard (13) arranged across the lampshade (10) opening for preventing flammable material (8) from making contact with the hot glass shield (6) of the bulb (4) or the bulb itself. A temperature sensor (25) is installed within the lampshade near the bulb to sense the rise in ambient temperature within the lampshade should its opening be covered by any material. The sensor comprises a thermostat (31) that de-energizes the bulb when the sensed ambient temperature reaches a predetermined value. The sensor may also comprise a thermistor (34) that operates the dimmer switch (T1) of the lamp to dim the bulb when the sensed ambient temperature reaches a predetermined value. The sensor may further comprise a photocell-powered thermistor (15) that varies the bias of a transistor (T1) which in turn causes the bulb to dim, thereby lowering the ambient temperature within the lampshade.
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