No flexibility
When there is the need to make an immediate change for a special event or a holiday, sometimes there is barely enough time to run all over to make the adjustments to meet the event.
Outdoor or daylit area lighting
When the natural lighting times change with the seasons, the timer would also need to be adjusted to match which is also troublesome.
One timer, one panel
Even though there would only be one setting for the timer for any given month or season, any single timer can only be used in any single panel. In a large building, it is certain that there would be multiple panels to cover different sections of any area or floor. To match the natural lighting, the timer needs to be adjusted accordingly with the month or the season, but with so many panels, this would become too cumbersome as the building manager would have to run all over to make the adjustments.
Incorrect or inaccurate time
It is recommended that a lighting control system be installed and each section would have the lights controlled by the LT3100, LT3704 or some other controller modules, the control for these modules would then be centralized on an ACS touch panel. The ACS panel would be set with the desired time schedule, the ACS would be connected to the host PC, the PC would then be able to propagate its clock time to all ACS that is connected to it.