What is not a method by which the emergency lighting system can operate?

The emergency lighting system on the Dassault Falcon 2000LXS can operate using battery power, generator power, and APU (Auxiliary Power Unit) power. These methods are standard in aircraft to ensure that emergency lighting remains functional during various failure scenarios. Battery power provides a reliable source for emergency lights if the main electrical systems fail. Generator power ensures that emergency lights can draw from the aircraft's powered circuits during normal operations. APU power is also a common source, providing electricity when the main engines are not running.

In contrast, solar power is not a method commonly utilized for aircraft emergency lighting systems. While solar technology exists, it is not practically or effectively integrated into the emergency lighting solutions offered in aircraft like the Falcon 2000LXS. Therefore, the answer highlights that solar power is not a viable option for operating the emergency lighting system.