Electrocine [sales] corporation offers twilight switches. These are light sensitive switches. They are equipped to switch on the lights at dawn and switch them off at dusk automatically. These switches have sensitivity control to switch on and off the lights at desired light level. They can also be provided with a timer function to switch off the lights after certain number of preset hours. The twilight switches also come in weather resistant boxes, in 3-phase with built-in contactor for 40 amp, 63 amp, and 100 amp loads.
