To automatically turn lights on and off, install this lighting controller from Royce Thompson Electric. It responds to ambient conditions, triggering the ON/OFF switch so you don't have to lift a finger when night turns to day. A high-speed silicon photodiode sensor changes states in a flash to save energy. Everything's encased in an IP65-rated housing, making the unit dust-tight and resistant to water splashes, so safe for use indoors and outdoors. You can rely on this product for glitch-free performance in temperatures between -20°C and +60°C.

• Diameter of only 85.5mm saves space in your system
• Energy-efficient unit consumes less than 0.25W power
• Translucent cover is UV-stable and impact-resistant

• Street lighting systems
• Security installations
• Shopping centres
• Office blocks

Installing this unit is easy – simply wire it according to the marked socket terminal connections and insert the base into a compatible fitting.

You mount the unit against a wall. This keeps it out of the way and safe from traffic risks or tampering.

Daylight Lighting Controllers

These controllers automatically turn lights 'ON' and 'OFF' in response to changes in ambient light levels, primarily the transition from day to night and vice-versa. The more advanced types (see note below) have inbuilt logic to minimise false triggering, whereas the remainder have inbuilt time delays or higher 'OFF' thresholds, to prevent on/off cycling. As a general rule, these controllers should be sited such that they are not illuminated, by the light they are controlling. Nominal supply voltage is 230Vac.,Note regarding energy-saving negative-hysteresis controllers,Where figures for the 'OFF' threshold are lower than for the 'ON' threshold, the sensor is designed such that four thresholds are actually monitored. These are: dusk, the middle of the night, dawn and the middle of the day. Monitoring at times other than dusk and dawn enables the sensor to determine what it should be looking for next, minimising false triggering and improving overall controller operation.