| 摘要 |
An electric lighting unit incorporates a main fluorescent lamp which is normally illuminated from an A.C. supply as well as an auxiliary emergency fluorescent lamp which is automatically switched on if the supply should fail. The unit has the usual base which contains not only the auxiliary equipment for the main lamp but also a rechargeable battery, incorporated in an encapsulated unit, and, incorporated in another encapsulated unit, a charger for normally trickle-charging the battery from the A.C. supply, a solid-state inverter, and a solid-state switching device responsive to failure of the A.C. supply to switch on the inverter to illuminate the auxiliary lamp from the battery. The auxiliary lamp is supported by the main lamp.
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