light sensor lamp

As we all know, energy issues become more and more important in our daily life.In this way, a lot of sensors are designed to save energy. Light-sensor lamp is one of the most typical implications of sensor. It has a wide range of usages both in public area and private area. Firstly, what is a sensor? A sensor is a device that measures a physical quantity and converts it into a signal which can be read by an observer or an instrument. For example, a mercury-in-glass thermometer converts the measured temperature into expansion and contraction of a liquid which can be read on a calibrated glass tube. Athermocouple converts temperature to an output voltage which can be read by a voltmetre. For accuracy, most sensors are calibrated against known the standard. Then what is a light sensor? A light sensor is a device that is used to detect light. There are many different types of light sensors, each of which works in a slightly different way. A photocell or photoresister, for example, is a small sensor that changes its resistance when light shines on it; they are used in many consumer products to determine the intensity of light. A charged coupled device, transports electrically charged signals, and is used as a light sensor in digital cameras and night-vision devices.  The light sensor Lamps are used widely in our dalily life such as streetlights, house door lights, front lights of cars and so on. On one hand, t hey give out excellent light, save energy and look great. A hat-trick of benefits from compact fluorescent lamps. They consume much less electricity than conventional incandescent lamps, they last much longer and they can be used in place of almost any ordinary light bulb because they are so compact.On the other hand, They save a lot of huamn resouces and brought a lot of conviniences for everyone's daily life. As a fornt lingt sensor of a car, it makes drivers much safer than before. People will forget to turn on all kinds of light in the car sometimes, in which case, the driving is very dangerous. But，with light sensor front light, drivers dont need to worry about that anymore. But light sensors in car are expensive, only expensive cars have those devices, to work out a cheap light sensor for every car has great meaning to every driver. Further more, Light sensor cannot be very acurate sometimes, which means people will drive in dark situation sometimes and it's hard to tell a standard light on the street. So to make the light sensor more acurate is a very important thing for designers to consider. Overall, light sensor lamps are great energy saving devices in our daily life Aodong Wei