The 120VAC for the car lighting does not use the UPS. The emergency lights should be on a separate battery. There are two switches on the face of the LEV controller. One is for the 230VAC power and one is for the car lighting. Are you sure that you are looking at the correct switch? Also, for the time being, disconnect the transformer and pigtail a 25w lamp on the light wires, so you can tell when you have the 120VAC line back. Sometimes, there is a light switch inside the elevator. Is it on? Also, the LEV has a circuit that turns off the lights in the car after 5 minutes of non-use. The relay that accomplishes this may be bad. How old is this unit? Does it have a separate motor drive or is the drive part of the SBC in the controller? Is there a PLC in the controller? What kind of emergency lights do you have? Is there a separate box on the cartop for this?