When the programmable twilight switch such as the iC2000P+ is programmed with a time period and a lux level, the twilight switch will energise the load during the set periods. Outside of this, the loads will be energised only by the threshold of the set lux levels. To note, if a time period is set, this will override any programmed settings for the lux levels, giving the time program the priority. When a special program is created such as Night-Break, this will override both time program and lux level settings.