How can one control the lighting for places such as a shopping mall or a factory floor so that they can all be turned on or off at the same time?

One should make use of magnetic contactors for their large current capacity in conjunction the LT3100. A single LT3100 has 4 channels for controlling up to 4 magnetic contactors. An ACS40 touch panel as the user control interface with its automatic scheduled control is ideal for use to turn the lights on and off from a preset schedule.

An item worth mentioning is that even though it is lighting for large areas, one should still consider having two periods of control, one should be for all the lights to remain on during business hours. While the other is for after business hours, in which only the important lights should remain on, while the rest are turned off in order to save on energy.