A multiple location load control system may comprise a main load control device and an accessory load control device. The main load control device may control an amount of power delivered to an electrical load from an AC power source using a control circuit and a controllably conductive device. The accessory load control device may be coupled to the main load control device via an accessory terminal. The accessory load control device may detect a user input for changing a characteristic of the electrical load and may send a signal to the main load control device indicating the user input. The main load control device may detect a pattern of the signal based on a threshold and further determine the user input in response to the detected pattern. The main load control device may adjust the threshold based on line/load conditions of the multiple location load control system.

A multiple location load control system may comprise a main load control device and an accessory load control device. The main load control device may control an amount of power delivered to an electrical load from an AC power source using a control circuit and a controllably conductive device. The accessory load control device may be coupled to the main load control device via an accessory terminal. The accessory load control device may detect a user input for changing a characteristic of the electrical load and may send a signal to the main load control device indicating the user input. The main load control device may detect a pattern of the signal based on a threshold and further determine the user input in response to the detected pattern. The main load control device may adjust the threshold based on line/load conditions of the multiple location load control system.

An illumination apparatus which has a standby feature whereupon switching off the light fixture, minimal standby feature operations may be implemented using an alternative power source. By turning off the light switch, the light fixture may switch from a first operating mode, such as an illumination mode, into a standby mode. While in standby mode, the light fixture may operate in the standby mode connected to a secondary power supply, such as a battery. While in the standby mode, the light fixture may operate to conserve power while ensuring that the sensor can operate along with a subset of the control circuit. Upon detection of motion while in standby mode, the secondary power supply may work in conjunction with the standby circuit to power a single, or all of the, light source(s) at a lower output powered only by the secondary power supply.

An illumination apparatus which has a standby feature whereupon switching off the light fixture, minimal standby feature operations may be implemented using an alternative power source. By turning off the light switch, the light fixture may switch from a first operating mode, such as an illumination mode, into a standby mode. While in standby mode, the light fixture may operate in the standby mode connected to a secondary power supply, such as a battery. While in the standby mode, the light fixture may operate to conserve power while ensuring that the sensor can operate along with a subset of the control circuit. Upon detection of motion while in standby mode, the secondary power supply may work in conjunction with the standby circuit to power a single, or all of the, light source(s) at a lower output powered only by the secondary power supply.