WO2022190132A1

WO2022190132A1 - Street light device

Info

Publication number: WO2022190132A1
Application number: PCT/IN2022/050224
Authority: WO
Inventors: Devendrasinh Gulabsinh Rajput
Original assignee: Devendrasinh Gulabsinh Rajput
Priority date: 2021-03-10
Filing date: 2022-03-10
Publication date: 2022-09-15

Abstract

The present invention discloses a street light device (100) for controlling intensity and illumination of streetlight. The street light device (100) includes a sensor unit (208), a control unit (102), a driver unit (310), a power supply unit (104) and a light unit (106). The control unit (102), when coupled with the sensor unit (208) and driver unit (310), is configured to control the illumination of the light unit (106). The control unit (102) includes a storage unit (306), a controller (302) configured with a selection module (304) and a power switch (308). The control unit (102) selectively activates the driver unit (310) in accordance with the signals received from the sensor unit (208).

Description

“STREET LIGHT DEVICE”

FIELD OF THE INVENTION

The present invention relates streetlight device and more particularly, the present invention relates to a device for real time controlling intensity and illumination of streetlight.

BACKGROUND OF THE INVENTION

Electricity is a form of energy carried by wires and is used to provide power to devices, systems, machines etc. Electricity is most used in buildings for lighting and appliances, in industrial processes for production of goods. The requirement of power varies as per the application and is a crucial criterion to evaluate the power consumption. The higher consumption of electricity not only leads to greater costs but also contributes to damaging the environment. Reduction in power consumption of a system is a crucial area of development for many researchers. In street lighting systems, new technologies such as LEDs have made a significant effort in reducing the power consumption of a system. However, a drawback of these LEDs is that the cost of these technologies is very high and this offsets the cost saved by reducing energy consumption.

Many existing systems available in the prior art describe use of motion detectors and control system to switch streetlights ON and OFF. However, the drawback of these types of systems is that when there is no movement around, the streetlights are turned OFF completely which is not allowed in premises such as military bases, hospitals, airports, etc.

Many lighting systems tend to consume higher amount of electricity due to continuous usage and obsolete components in the system. For example, lighting systems in factories, industries, roadways and the like. There is an increase in usage of compact fluorescent lights (CFLs) which are compact and efficient. These CFLs are replacements to the widely used incandescent light bulbs or lamps with wire filaments. Although, incandescent bulbs typically have short lifetimes compared with other types of lighting and are easily replaceable by the compact fluorescent lights (CFLs), high-intensity discharge lamps and light emitting diodes (LEDs).

Light emitting diodes (LEDs) are semiconductor light sources that emit light when current flows through the LEDs. The advantages of light emitting diodes have a longer lifespan, are energy efficient, no heat or UV emissions. Many electrical lighting systems that include LEDs have significantly reduced the power consumption of the electrical system.

However, another drawback of using these LEDs is the cost one has to pay for using these technologies for long hours. Although, the use of LEDs has proved to be a boon for mankind, making the use of the technology judiciously and economical is an area of continuous improvement. US Patent No. 10174908B2 discloses a LED device that generates wide beam. The invention discusses apparatus and methods for using light emitting diodes (LEDs) or other light sources to generate wide profile illumination patterns. However, the invention does not teach use of controlled methods or use of sensors to control illumination or intensity of lighting systems to conserve energy. Accordingly, there is a need of a street light device for real time controlling the intensity and illumination of light. There is a further need of the street light device that reduces excessive illumination of lights at times where illumination is not required and protecting the components of the device from voltage spikes. SUMMARY OF THE INVENTION

In one aspect, the present invention discloses a street light device for controlling intensity and illumination of streetlight. The street light device includes a sensor unit, a control unit, a storage unit, a driver unit, and a power supply unit. The sensor unit includes a first sensor and a pair of second sensor positioned in the vicinity of a lamp post.

The control unit is positioned on the middle portion of the lamp post. The control unit is configured for receiving signal from the sensor unit, sensing the received signal the from sensor unit and sending the output signal to a light unit. The storage unit is configured on the control unit for storing the pre-set data. A selection module is configured on the control unit for comparing the received signal from sensor unit with the pre-set data, and output a corresponding control signal for controlling the illumination of a light unit.

The driver unit is configured for receiving the control signal from a selection module and selectively giving input to the light unit. The power supply unit includes a protection device for protecting the components from voltage spikes and a power source for supplying electric power to the control unit and the light unit.

The first sensor is positioned over top surface of the control unit and configured for sensing the light. The pair of second sensor is opposedly positioned on the bottom surface of the control unit and configured for motion detection. The second sensor is configured for motion detection.

The driver unit includes a first driver and a second driver, for swift operation of controlling the light unit according to the received control signal from the control unit. The protection device is connected in parallel on the power source circuit of the power supply unit.

The control unit sends a signal to the driver unit to turn OFF the light unit on receiving a negative signal from the first sensor. The control unit sends a signal to the driver unit to turn ON the light unit with 100% illumination on receiving a positive signal from the sensor. The control unit sends a signal to the driver unit to turn ON the light unit with 20% illumination on receiving a positive signal from the sensors and negative signal from the second sensor.

In another aspect, the present invention discloses a street light device for controlling intensity and illumination of streetlight using a plurality of sensors. The street light device includes a sensor unit, a control unit, a storage unit, a driver unit, and a power supply unit. The sensor unit includes a plurality of sensors positioned in the vicinity of the lamp post.

The control unit includes a storage unit for storing the pre-set data, a controller configured with a sensing and selection module for comparing the received signal from the sensor unit with the pre-set data and output a corresponding control signal and a power switch for combiningly controlling the illumination of a light unit. The control unit is configured for receiving signal from the sensor unit, sensing the received signal, and selecting the output signal.

The driver unit is configured for receiving the control signal from the controller and selectively giving input to the light unit. The power supply unit includes a protection device for protecting the components from voltage spikes and a power source for supplying electric power to control unit and light unit.

The light unit includes a first lamp and a second lamp for illumination. The first lamp includes a combination of a white illumination lamps to be used for normal weather. The second lamp includes a combination of yellow illumination lamps having a long wavelength of light to be used for bad weather of rainy or foggy weather.

BRIEF DESCRIPTION OF DRAWINGS The objectives and advantages of the present invention will become apparent from the following description read in accordance with the accompanying drawings wherein FIG. 1 shows a of a street light device mounted on a lamppost in accordance with the first embodiment of the present invention;

FIG. 2 shows a cross sectional view of the street light device of FIG. 1;

FIG. 2A shows an enlarged cross-sectional view of a light unit of the street light device of FIG. 1;

FIG. 2B shows an enlarged cross-sectional view of a control unit of the street light device of FIG. 1;

FIG. 3 shows an architectural representation of the street light device of FIG. 1;

FIG. 4 shows a circuit drawing of the control unit of the street light device of FIG. 1;

FIG. 5 shows a circuit drawing of a protection device of the street light device of FIG. 1;

FIG. 6 shows steps involved in operation of the street light device of FIG. 1 in accordance the first embodiment of the present invention; FIG. 7 shows an architectural representation of a street light device in accordance with the second embodiment of the present invention; and

FIG. 8 shows steps involved in operation of the street light device of FIG. 3 in accordance the second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

The invention described herein is explained using specific exemplary details for better understanding. However, the invention disclosed can be worked on by a person skilled in the art without the use of these specific details. References in the specification to "one embodiment" or "an embodiment" means that particular feature, structure, characteristic, or function described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of the phrase “in one embodiment” in various places in the specification are not necessarily all referring to the same embodiment.

References in the specification to “preferred embodiment” means that a particular feature, structure, characteristic, or function described in detail thereby omitting known constructions and functions for clear description of the present invention.

Referring to FIG. 1, a street light device 100 (herein after referred to as “device 100”) in accordance with first embodiment of the present invention is shown. The device 100 is mounted on a lamp post 10. The lamp post 10 is positioned at the edge of the street for illumination. The device 100 includes a control unit 102, a power supply unit 104 and a light unit 106.

The control unit 102 is positioned on the middle portion of the lamp post 10 and the power supply unit 104 is fixed near bottom side of the lamp post 10. The light unit 106 positioned over the top portion of the lamp post 10. A set of wires and cables runs inside hollow portion of the lamp post 10 and connects the control unit 102, the power supply unit 104 and the light unit 106 with each other.

In this embodiment of the present invention, the lamp post 10 and of length 9 metre. The control unit 102 is mounted at distance 5 metre from the base of the lamp post 10. The power supply unit 104 is fixed at distance 1 metre from the base of the lamp post 10. However, it is understood that the dimensions for positioning the components of device 100 on the lamp post 10 may vary in other embodiments.

Now referring to FIGS. 2, 2A and 2B, cross sectional views of the street light device are discussed herein after. The lamp post 10 is hollow and it allows a set of wires and cables 202 to runs inside the lamp post 10. The set of wires and cables 202 connects the control unit 102, the power supply unit 104 and the light unit 106 with each other. The light unit 106 includes a housing 204 and a plate 206. The plate 206 with the set of wires 202 is positioned inside the housing 204 such that a bunch of visible light rays emit from the transparent surface of the light unit 106. The light unit 106 when energized with electricity, emit light and act as guide to pedestrians as well as vehicle drivers in the dark. The plate 206 in this embodiment is, for example, a LED light, CFL light, metal halide lights and LPS lights.

The control unit 102 receives input signal from a sensor unit 208 that is positioned over its opposite surface. The sensor unit 208 includes a first sensor 210 and an opposed pair of second sensor 212. The sensors 210 and 212 are strategically positioned in the vicinity of the lamp post 10. The first sensor 210 is positioned over top surface of the control unit 102 and the pair of second sensor 212 is positioned on the bottom surface of the control unit 102.

In accordance with the first embodiment of the present invention, the first sensor 210 is preferably a day night sensor that works on the principle of illumination of light, that turns on the lamp when there is dark and turns off the lamp when day light comes. The second sensor 212 is preferably a passive infrared sensor i.e., PIR sensor that operates based on the detecting motion in the vicinity of the sensor. However, the type of sensors may vary in other alternative embodiments of the present invention.

Referring to FIG. 3, an architectural representation of a street light device 100 in accordance with first embodiment of the present invention is shown. The device 100 includes the sensor unit 208, the control unit 102, the power supply unit 104 and the light unit 106. The control unit 102 has one end coupled with the sensor unit 208 and the other end is connected to the light unit 106. The power supply unit 104 supplies power required to the control unit 102.

The control unit 102 is defined by a controller 302 i.e., configured to receive signals from the sensor unit 208 and process the signals. The control unit 208 selectively activates a driver unit 310 in accordance with the signals received from the sensor unit 208. The control unit 102, when coupled with the sensor unit 208, and driver unit 310, is configured to control the illumination of the light unit 106.

More specifically, the control unit 102 includes a selection module 304, a storage unit 306, and a power switch 308. A pre-set data is stored in the storage unit 306. The selection module 304 is configured on the controller 302 not only to receive the signal from the sensor unit 208 but also to retrieve the pre-set data from the storage unit 306. Further, the selection module 304 compares the received signal with the pre-set data and provides a corresponding output control signal according to the compared result. The driver unit 310 includes a first driver 312 and a second driver 314. The driver unit 310 is configured to receive the corresponding control signal from the selection module 304 and control the light unit 106 according to the received control signal. The driver unit 310 selectively gives input to the light unit 106.

The power supply unit 104 includes a protection device 316 and a power source 318. The protection device 316 is connected in parallel on the power source circuit 318. The protection device 316 is configured to protect electrical devices from voltage spikes in alternating current (AC) circuits.

In accordance with the first embodiment of the present invention, the controller configured on the control unit 102 includes a monostable multivibrator using timer IC. The monostable multivibrators have only one stable state and produce a single output pulse when it is triggered externally. The monostable multivibrators only return to their first original and stable state after a period of time determined by the time constant of the RC coupled circuit. The resistor R and capacitor C form an RC timing circuit. Further, in the monostable mode, the timer acts as a one-shot pulse generator. The pulses begin when the timer receives a signal at the trigger input that falls below a 1/3 of the voltage supply. The width of the output pulse is determined by the time constant of an RC network. The output pulse ends when the voltage on the capacitor equals 2/3 of the supply voltage. The output pulse width can be extended or shortened depending on the application by adjusting the R and C values. When the timer starts, the relay turns ON. Hence the Common (COM) terminal of the relay is shorted to the Normally Open (NO) terminal. A high-power load is connected to this terminal i.e., driver unit 310. A transistor Q1 acts as a switch and ensures sufficient drive current is provided to the relay. Diode D1 acts as a flyback diode that protects the transistor Q1 from voltage spikes caused by the relay coil. For controlling illumination of the light unit 106, the device 100 uses two different drivers that are the first driver 312 and the second driver 314. The drivers 312, 314 are coupled with the control unit 102. When the relay is turned on by the control unit 102 both the drivers 312, 314 are turned on to increase the current and increase the illumination of the light unit 106. After the time period set by the RC network one of the drivers turned off by the control unit 102 to reduce the power consumption and reduces the illumination of the light. Referring to FIG. 4, a circuit drawing of the control unit 102 of the street light device 100 is described. The control unit 102 has 8 pin connections among which, pin 1 is grounded. The trigger input is applied to pin 2. In quiescent condition of output, this input is kept at + Vcc. To obtain transition of output from stable state to quasi-stable state, a negative-going pulse of narrow width and amplitude of greater than + 2/3 Vcc is applied to pin 2. Output is taken from pin 3. Pin 4 is usually connected to + Vcc to avoid accidental reset. Pin 5 is grounded through a 0.01 u F capacitor to avoid noise problem. Pin 6 (threshold) is shorted to pin 7. A resistor R_A is connected between pins 6 and 8. At pins 7 a discharge capacitor is connected while pin 8 is connected to supply Vcc. Initially, when the output at pin 3 is low i.e., the circuit is in a stable state, the transistor is on and capacitor- C is shorted to ground. When output of the PIR sensor is high, transistor Q1 turns on and negative pulse is applied to pin 2, the trigger input falls below +1/3 Vcc, the output of comparator goes high which resets the flip-flop and consequently the transistor turns off and the output at pin 3 goes high. This turns relay on. This is the transition of the output from stable to quasi stable state.

As the discharge transistor is cut-off, the capacitor C begins charging toward +Vcc through resistance R_A with a time constant equal to R_AC. When the increasing capacitor voltage becomes slightly greater than +2/3 Vcc, the output of comparator 1 goes high, which sets the flip-flop. At this condition the control circuit turns the relay off. The transistor goes to saturation, thereby discharging the capacitor C and the output of the timer goes low. The output of the control circuit remains low until a trigger pulse is again applied. Then the cycle repeats. Referring to FIG. 5, a circuit drawing of the protection device 316 of the street light device 100 is described. The input to the protection device 316 is provided through feeder. Three input lines i.e., Phase, Neutral and Earth from feeder are connected to the input Phase, Neutral and Earth of the protection device 316. The output end of the protection device 316 includes two terminals i.e., Phase and Neutral. These output terminals are connected to input terminals of the driver unit 310 to pass the electrical current from the ports to the electronic devices.

Now referring to FIG. 6, the steps involved in operation of the street light device 100 in accordance the first embodiment of the present invention are described herein after. In step 602, the device 100 is initialized. In next step 604, the control unit

102 is activated. In step 606, the light unit 106 is lit for predefined time. In this step, the control is transferred towards step 608.

In the step 608, the control unit sense the signal received from the first sensor 210. In the next step 610, the input signal received from the sensor unit 208 is compared. If the input signal is negative signal, the control is transferred towards step 612. If the input signal is positive signal, the control is transferred towards step 616. In the step 612, the control unit 102 send the signal to driver unit 310 for turning off the light unit 106. In the next step 614, process is terminated for that instance.

In the next step 616, the input signal received from the second sensor 212 is compared. If the input signal is negative signal, the control is transferred towards step 620. If the input signal is positive signal, the control is transferred towards step 618.

In the step 618, the control unit 102 send the signal to driver unit 310 to illuminate the light unit 106 with 100% illumination. In the next step 622, process is terminated for that instance.

In the step 620, the control unit 104 send the signal to driver unit 310 to illuminate the light unit 106 with 20% illumination. In the next step 224, process is terminated for that instance.

Now referring to FIGS. 1 to 6, the device 100 in operation in accordance with first embodiment of the present invention is explained. The device 100 is started by pressing the switch 308 on the control unit 102. After starting, the light unit 106 is lit for a predefined amount of time (usually 180-240 seconds). During this predefined amount of time, the control unit 102 receives input from the first sensor 210. The first sensor 210 communicates two types of signals namely positive signal and negative signal to the control unit 102. When the control unit 102 receives a negative signal, the control unit 102 sends a signal to the driver unit 310 to turn OFF the light unit 106. When the control unit 102 receives a positive signal (i.e., no sunlight) from the first sensor 210, the control unit 102 sends a signal to the driver unit 310 to turn ON the light unit 106.

When the light unit 106 is ON, the control unit 102 continuously receives signals from the second sensor 212. If no motion is detected by the second sensor 212, the control unit 102 instructs the driver unit 310 to reduce the power supplied to the light unit 106. The power supplied to the light unit 106 is reduced to from 100% to 20% when there is no object detected by the second sensor 212. When the second sensor 212 detects an object (a pedestrian/car) the power supplied to the light unit 106 is increased to a 100% by the driver unit 310 for a predefined amount of time. Once the predefined amount of time is passed and no object is detected by the second sensor 212, the power supplied to the light unit 106 is reduced to 20% thereby dimming the light unit 106.

Referring to FIG. 7, an architectural representation of a street light device 700 in accordance with second embodiment of the present invention (herein after referred to as “device 700”) is shown. The device 700 is configured on a lamp post 50 arranged along a street for illumination. The device 700 includes a sensor unit 702, a control unit 704, a driver unit 706, a power supply unit 708 and a light unit 710. The light unit 710 further includes a first lamp 728 and a second lamp 730.

The control unit 704 has one end coupled with the sensor unit 702 and the other end to be connected to the driver unit 706 that is further connected to the light unit 710. The power supply unit 708 supplies power required to drive the driver unit 706 according to a control signal output from the control unit 704.

In this embodiment, the sensor unit include five types of sensors namely a first sensor 712, a second sensor 714, a third sensor 716, a fourth sensor 718, a fifth sensor 720, a sixth sensor 736 and a seventh sensor 738. These sensors are strategically placed in the vicinity of the lamp post. In accordance with the second embodiment, the first sensor 712 is preferably a light sensor that works on the principle of illumination of light and the second sensor 714 is preferably a passive infrared sensor i.e., PIR sensor. Further, the third sensor 716 is preferably a fog/rain sensor, the fourth sensor 718 is 718 is pollution sensor and the fifth sensor 720 is preferably a traffic flow sensor. Furthermore, the sixth sensor 736 is preferably an anti-corrosion sensor and the seventh sensor 738 is a bacterial load sensor.

The sixth sensor 736 track the changes occurring due to corrosion of the surface due to these factors and provide a signal about how much more time the light device will be functional under working conditions, and when is the time to replace it before it goes off.

Further, as the street light device is open to the atmosphere, there is a possibility of dust and carbon particles sticking to it. Sometimes due to constant humid atmospheric conditions, bacteria can grow on the surfaces of the light device and can cover the surface which can alter the light intensity. The seventh sensor 738 is configured to detect the load of bacteria on the street light device. If a pre set limit of bacteria is crossed, a film of bacteria can coat the surface of the light device and can cause less light passage. The seventh sensor 738 provide signals as to when the street light device requires cleaning from the bacterial film formation for normal working. The output signal received by the sixth sensor 736 and the seventh sensor 738 is displayed on the display screen of the control unit 704.

The control unit 704 is configured to receive signals from the sensor unit 702 and process the signals. The control unit 704 is configured to control the illumination of the light unit 710. Specifically, the control unit 704 includes a storage unit 722, a controller configured with sensing and selection module 724 and a power switch 726. The control unit 704 is stored with pre-set data in the storage unit 722. The controller 724 receives the signal from the sensor unit 702, also retrieves the pre-set data from the storage unit 722. Further, the sensing and selection module configured on the controller 724 compare the received signal with the pre-set data and output a corresponding control signal according to the compared result.

The driver unit 706 is configured to receive the corresponding control signal from the controller 724 and control the light unit 710 according to the received control signal. The driver unit 706 selectively drives the light unit 710.

The power supply unit 708 includes a protection device 732 and a power source 734. The protection device 732 is connected in parallel on the power source circuit 734. The protection device 732 is configured to protect electrical devices from voltage spikes in alternating current (AC) circuits. The light unit 710 in this embodiment, further includes a first lamp 728 and a second lamp 730. The first lamp 728 is a white light lamp and the second lamp 730 is a yellow light lamp. The first lamp 728 includes a combination of a white illumination lamps to be used for normal weather and the second lamp 730 includes a combination of yellow illumination lamps having a long wavelength of light to be used for bad weather of rainy or misty/ foggy weather. The control unit 704 selectively activates one of first lamp 728 and the second lamp 730 in the light unit 710 and controls its intensity according to the signals received from the sensor unit 702.

Now referring to FIG. 8, the steps involved in operation of the street light device 700 in accordance the second embodiment of the present invention are described herein after.

In step 802, the device 700 is initialized. In next step 804, the control unit 704 is activated. In step 806, the light unit 710 is lit for predefined time. In this step, the control is transferred towards step 808.

In the step 808, the control unit sense the signal received from the sensor unit 702. In the next step 810, the input signal received from the sensor unit 702 is compared.

In the step 810, the control unit 704 send the control signal to the driver unit 706 for activating the light unit 710 according to illumination intensity based on the signal received from sensor unit 702.

In next step 812, control unit activates the first lamp 728 or the second lamp 730 as per the received signal from the sensor unit 702. In the next step 814, process is terminated for that instance.

Now referring to FIGS. 7 and 8, the device 700 in operation in accordance with the second embodiment of the present invention is explained. The device 700 is started by pressing the switch 726 on the control unit 704. After starting, the light unit 710 is lit for a predefined amount of time (usually 180-240 seconds). During this predefined amount of time, the control unit 704 receives input from the sensor unit 702.

The first sensor 712 communicates two types of signals namely positive signal and negative signal to the control unit 704. When the control unit 704 receives a negative signal, the control unit 704 sends a signal to the driver unit 706 to turn OFF the light unit 710. When the control unit 704 receives a positive signal (i.e. no sunlight) from the first sensor 712, the control unit 704 sends a signal to the driver unit 706 to turn ON the light unit 710. When the light unit 710 is ON, the control unit 704 continuously receives signals from the sensors 714, 716, 718 and 720. If no motion is detected by the second sensor 714 or no rainy/foggy weather detected by third sensor 716 or no pollution detected by the fourth sensor 718 or less traffic flow detected by the fifth sensor 720, the control unit 104 instructs the driver unit 706 to reduce the power supplied to the light unit 710 from 100% to 20%. When the second sensor 714 detects an object (a pedestrian/car) or rainy/foggy weather detected by third sensor 716 or maximum pollution level detected by the fourth sensor 718 or high traffic flow detected by the fifth sensor 720, the power supplied to the light unit 710 is increased to a 100% by the driver unit 706 for a predefined amount of time. Once the predefined amount of time is passed, the power supplied to the light unit 710 is reduced to 20% thereby dimming the light unit 710.

The street light device of the advantageously reduces the consumption of power by the light unit when there is no movement. The street light device advantageously controls the illumination of the light unit in accordance with the motion below the lamp, day/night time, and real time weather, pollution and traffic condition on the street. The device of the present invention specifically maintains the illumination of the lamp at a minimum level without switching it OFF. The street light device advantageously reduces greenhouse gas emissions by saving electricity. The foregoing description of specific embodiments of the present invention has been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching.

The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application, to thereby enable others, skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated.

It is understood that various omission and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the scope of the present invention.

Claims

Claims:

1. A street light device 100 for controlling intensity and illumination of streetlight comprising: a sensor unit 208 including a first sensor 210 and a pair of second sensor 212 positioned in the vicinity of a lamp post 10; a control unit 102 positioned on the middle portion of the lamp post 10 and configured for receiving signal from the sensor unit 102, sensing the received signal the from sensor unit 208 and sending the output signal to a light unit 106; a storage unit 306 configured on the control unit 102 for storing the pre-set data; a selection module 304 configured on the control unit 102 for comparing the received signal from sensor unit 208 with the pre-set data, and output a corresponding control signal for controlling the illumination of a light unit 106; a driver unit 310 configured for receiving the control signal from a selection module 304 and selectively giving input to the light unit 106; and a power supply unit 104 including a protection device 316 for protecting the components from voltage spikes and a power source 318 for supplying electric power to the control unit 102 and the light unit 104.

2. The street light device 100 as claimed in claim 1, wherein the first sensor 210 is positioned overtop surface of the control unit 102 and configured for sensing the light and the second sensor 212 is configured for motion detection.

3. The street light device 100 as claimed in claim 1 , wherein the pair of second sensor 212 is opposedly positioned on the bottom surface of the control unit 102 and configured for motion detection.

4. The street light device 100 as claimed in claim 1, wherein the driver unit 310 includes a first driver 312 and a second driver 314, for swift operation of controlling the light unit 106 according to the received control signal from the control unit 102.

5. The street light device 100 as claimed in claim 1, wherein the protection device 316 is connected in parallel on the power source circuit 318 of the power supply unit 104.

6. The street light device 100 as claimed in claim 1, wherein the control unit

102 sends a signal to the driver unit 310 to turn OFF the light unit 106 on receiving a negative signal from the first sensor 210.

7. The street light device 100 as claimed in claim 1, wherein the control unit 102 sends a signal to the driver unit 310 to turn ON the light unit 106 with 100% illumination on receiving a positive signal from the sensors 210, 212.

8. The street light device 100 as claimed in claim 1, wherein the control unit 102 sends a signal to the driver unit 310 to turn ON the light unit 106 with 20% illumination on receiving a positive signal from the sensors 210 and negative signal from the second sensor 212.

9. A street light device 700 for controlling intensity and illumination of streetlight comprising: a sensor unit 702 including a plurality of sensors positioned in the vicinity of the lamp post; a control unit 704 including a storage unit 722 for storing the pre set data, a controller configured with a sensing and selection module 724 for comparing the received signal from the sensor unit 702 with the pre-set data, and output a corresponding control signal and a power switch 726 for combiningly controlling the illumination of a light unit 710, the control unit 704 configured for receiving signal from the sensor unit 702, sensing the received signal and selecting the output signal; a driver unit 706 configured for receiving the control signal from the controller 724 and selectively giving input to the light unit 710; a power supply unit 708 including a protection device 732 for protecting the components from voltage spikes and a power source 734 for supplying electric power to control unit 704 and light unit 710; and the light unit 710 including a first lamp 728 and a second lamp 730 for illumination.

10. The street light device 700 as claimed in claim 9, wherein the first lamp 728 includes a combination of a white illumination lamps to be used for normal weather and the second lamp 730 includes a combination of yellow illumination lamps having a long wavelength of light to be used for bad weather of rainy or foggy weather.