Abstract:
The energy consumption in lighting is increasing day by day. Lot of efforts have been made in order to minimize the energy consumption in lighting. Photovoltaic (PV) is the best solution for the energy requirements in the future. The project is designed for LED based street lights with an auto-intensity control that uses solar power from photovoltaic cells. A charge controller circuit is used to control the charging of the battery, and an LDR is used to sense the ambient light on day time, The street lights are switched on at the dusk and then switched off at the dawn automatically by using a sensing device LDR .The intensity of street lights is required to be kept high during the peak hours. As the traffic on the roads tends to decrease slowly in late nights, the intensity can be reduce using PIR sensor by detecting the movement to save energy. LED lights are the future of lighting, because of their low energy consumption and long life they are fast replacing conventional lights world over. White light emitting diode (LED) replaces the HID lamps where intensity control is possible by pulse width modulation.
