| 摘要 |
A lighting system for a suspended ceiling comprises a plurality of power conditioning units permanently wired-in with the 120 Volt/60 Hz power line and mounted in various suitable locations on the permanent ceiling above the suspended ceiling. Each power conditioning unit conditionally provides a voltage at each of several multi-connector power output ports. Each power output port is operable: (i) to connect with a special lighting fixture by way of a light-weight flexible disconnectable connect cord; and (ii) on receipt of a special signal from the lighting fixture, to power the lamp(s) therein. Plural such special lighting fixtures are mounted in the suspended ceiling, with each lighting fixture being connected with and powered from one of the power output ports of a power conditioning unit mounted somewhere nearby on the permanent ceiling above. Due to the manifestly power-limited nature of the output of each of the power output ports, as combined with the light-weight flexible and detachable nature of the connect cords, each special lighting fixture may be made without the usual concerns with respect to fire-initiation safety and may be treated as a plug-in portable lighting product; which implies particularly low cost and a high degree of flexibility in installation and use.
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