Seeking advice on using normal lighting as backup lighting

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A clean room is to be constructed now; the room is divided into numerous sections. In accordance with regulatory requirements, backup lighting must be provided, and the illuminance level should be sufficient to support necessary activities and operations. It is also advisable to use part of the normal lighting as backup lighting. So what should I do in this situation? 1. The factory is equipped with generators, and the lighting distribution panels in the factory buildings are designed for dual switching; the lighting throughout the factory relies on two power sources, both of which serve as backup lighting. If we do this, will all lighting circuits use fire-resistant cables? 2. Each room is equipped with Type A emergency lighting as backup lighting. 3. Each room uses one or two lights with normal lighting as backup lighting, with a generator serving as the backup power source. I think the intended meaning by \"standardization\" is the third option, but is the actual implementation really that complicated in terms of wiring? Because the fire protection circuits need to be separate. I lean towards the first approach. I’d like to ask everyone here how to do it; thank you!