Truly electronic on / off switch for zero stand-by power consumption

Abstract

The invention relates to a lighting device comprising an energy storage device, a light source, a controller for controlling the light source, a startup component coupled between the energy storage device and the controller and adapted to provide a start-up power to the controller upon an activation of the startup component by creating an electrical connection between the energy storage device and the controller and a shunt device coupled between the energy storage device and the controller, wherein the controller is arranged to activate the shunt device after the start-up to shunt the startup component.

Description

[0001] Truly electronic On / Off switch for zero stand-by power consumption

[0002] FIELD OF THE INVENTION

[0003] The invention relates to lighting device. The invention further relates to a lighting system.

[0004] BACKGROUND OF THE INVENTION

[0005] An easy way to connect or disconnect a lighting device from an energy storage device, such as a battery, a mechanical switch may be used. The mechanical switch may provide a physical interruption of the electrical path between the energy storage device and its load. This mechanical switch can be manually controlled but shall be reachable, visible, touchable or controllable. Therefore, the mechanical switch shall be in such a place of the lighting device, normally at the outside, that it can be reached by a user.

[0006] A normal mechanical switch is not liquid proof, this means that fluids can penetrate into the device which may hamper it. Sometimes it is unwanted that an electronic device has openings, due to safety regulations or hazardous situations.

[0007] When one is making use of a fully enclosed lighting device which may e.g., be wireless or contactless controlled, this lighting device can never be put into a zero power condition when deactivated. The RF -radio shall be kept alive to immediately respond to an external incoming signal which must reactivate the lighting device operation. Such a standby mode always uses power which drains the energy storage device. The standby energy consumption can be “low” but never zero power.

[0008] It is desired to provide a lighting device that can be put to a standby mode or off mode where the energy consumption is zero or close to zero Watt.

[0009] SUMMARY OF THE INVENTION

[0010] It is an objective of the invention to provide a lighting device that has (almost) zero losses in the off or standby mode.

[0011] To provide a solution for this objective, in a first aspect of the invention, a lighting device is provided.

[0012] The lighting device comprises: an energy storage device; a light source; a controller for controlling the light source; a startup component coupled between the energy storage device and the controller and adapted to provide a start-up power to the controller upon an activation of the startup component by creating an electrical connection between the energy storage device and the controller, a shunt device coupled between the energy storage device and the controller, wherein the controller is arranged to activate the shunt device after the start-up to shunt the startup component.

[0013] It is desired to provide a lighting device that has (almost) zero power losses when the lighting device is turned off. This saves the energy that is present in the energy storage device. A physical separation between the energy storage device and the remaining parts of the lighting device provides the best results as not even a leakage current can flow out of the energy storage device to the remaining parts.

[0014] The example provided provides a separation between the energy storage device and the remaining parts. This provides a challenge on how to turn on the circuitry in the lighting device since the controller is unable to receive any signal. The lighting device has a controller that controls the light source. The controller also controls the shunt device. However, without power, the controller will not be able to control anything. The startup component is used for providing a power to the controller at start-up. This allows the controller to become active. The controller is powered and may therefore control the shunt device to be active and shunt the startup component. The shunt device provides an electric path between the energy storage device and the controller and therefore, the controller maintains power via the shunt device, regardless of the startup component’s status. As an example, the startup component may be activated for a short moment, which provides sufficient time for the controller to start up. When the controller has activated the shunt device, the controller may further be used to control the light source.

[0015] A major benefit is that because no energy is lost in the off state of the lighting device, a smaller energy storage device can be used. This allows the lighting device to be made very small, allowing the lighting device to be implemented as a stand-alone building block in a larger modular system. In a further example, the startup component is arranged to provide a temporary electric connection between the energy storage device and the controller upon activation of the startup component by an event external to the lighting device.

[0016] Preferably, the startup component is only activated for a short period of time. This removes the need for a constant actuation of the startup component by an external device and therefore simplifies the turning on of the lighting device.

[0017] In a further example, the lighting device further comprises a current regulator for controlling a current to the light source.

[0018] Preferably, the lighting source has a current regulator. The current regulator may be used for regulating a current through the light source. The controller may be used to control the current regulator or enable the current regulator.

[0019] In a further example, the lighting device further comprises a wireless communication module arranged to receive wireless signals for controlling the light source.

[0020] Preferably, the lighting device may receive wireless signals from external devices. Therefore, the controller may be used to enable the wireless communication module. The wireless communication module is also powered by the energy storage device via the shunt device.

[0021] In a further example, the lighting device further comprises a wireless charging module arranged for charging the energy storage device wirelessly using a wireless charging signal.

[0022] As an additional feature, the lighting device may be wirelessly chargeable. This allows the energy storage device to be charged using a wireless interface. No additional connections are therefore required.

[0023] In a further example, the wireless charging module is arranged to be powered from wireless charging signal.

[0024] Using the wireless charging signal to power the wireless charging module may provide a simplification of the power management inside the lighting device. The wireless charging module only needs to be active when in the vicinity of a wireless charger. The wireless charging module then does not need to be powered by the energy storage device. This simplifies the power connections in the lighting device and further lowers the power consumption in the lighting device.

[0025] In a further example, the controller comprises a signal input for receiving a signal, wherein upon activation of the startup component, a signal is provided to the signal input. The startup component may be used for a further function, besides starting up the controller. After start-up of the controller, the startup component may be actuated again. Coupling the startup component to a signal input of the controller may allow the controller to read out this signal. The controller may use this signal for different purposes like scene switching.

[0026] In a further example, the controller is arranged to turn off the shunt device upon receiving the signal.

[0027] The controller may act upon receiving the signal by turning off the shunt device. This causes the controller to lose power and therefore, the light source will also turn off. The energy storage device is effectively disconnected from the remaining parts of the lighting device. The controller therefore effectively turns off the lighting device.

[0028] In a further example, the light source comprises a plurality of colour LEDs.

[0029] Preferably, the light source has multiple LEDs which are capable of generating colored light.

[0030] In a further example, the lighting device further comprises a housing, wherein the housing is arranged to hermetically enclose the energy storage device, the light source, the controller, the startup component and the shunt device.

[0031] Preferably, the lighting device has a housing that hermetically encloses all startup components that are comprised in the lighting device. Such housing provides an optimum protection for the startup components and prevents tampering from outside without damaging the housing.

[0032] Preferably, the lighting device is used in a system that has multiple building blocks, allowing a modular system to be built. A hermetically sealed housing allows the lighting device to have a similar shape as any other building block in the system, allowing the lighting device to be integrated optimally in the system.

[0033] In a further example, the lighting device comprises a magnet.

[0034] The light device may have a magnet. The magnet may be used for easy mounting of the lighting device to ferromagnetic surfaces. When the startup component is a device that is sensitive to a magnetic field e.g., a reed switch, it is desired that the magnet is placed at a distance sufficient away from the startup component to avoid interference.

[0035] In a further example, the startup component comprises an electric circuit adapted to, upon receiving a non-electric energy, provide the electrical connection between the energy storage device and the controller. The startup component may be designed such that multiple electronic startup component s fulfil the function of converting a non-electric energy into a signal that allows an electric connection to be created between the energy storage device and the controller.

[0036] In a further example, the startup component is a reed switch.

[0037] A very simple implementation of a startup component is a reed switch. A reed switch may be used without any additional electronic components to create an electrical connection between the energy storage device and the controller. The reed switch may be activated by placing a magnet close to the reed switch. A user can easily place a magnet close to the reed switch. A magnet may for example be placed at an end of a rod, allowing the reed switch to be activated from a distance.

[0038] In another example, a lighting system is provided. The lighting system comprises a plurality of lighting devices and a hub adapted to provide a wireless communication link between a user interface and the plurality of lighting devices.

[0039] Multiple lighting devices can be arranged in a lighting system. Preferably, the lighting devices have wireless communication capabilities. A single hub may be used to communicate with the lighting devices. The hub may then also be used to communicate with a user interface. Instead of making direct connections with each of the lighting device, the hub arranges the wireless communication, providing an improved experience for a user because only a wireless communication is required between the hub and the user interface.

[0040] In another example, a lighting system is provided comprising a plurality of lighting devices according wherein the lighting devices are arranged to form a wireless mesh network.

[0041] Instead of communicating with a hub, the lighting devices may form their own mesh network. Addressing a single lighting device allows a user to use a user interface to interact with all lighting devices using a single wireless connection. The addressed lighting device relays the information to the mesh network.

[0042] By providing wireless modules in the lighting device, the lighting device can be provided in a system as an independent stand-alone building block. The lighting device can communicate and charge independent of a systems configuration. Furthermore, the use of the wireless interfaces allows further miniaturization.

[0043] BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Examples of the invention will now be described with reference to the accompanying drawings, in which: Fig. 1 shows an example of a circuit diagram of a lighting device.

[0045] Fig. 2 shows another example of a circuit diagram of a lighting device. Fig. 3 shows another example of a circuit diagram of a lighting device. Fig. 4 shows another example of a circuit diagram of a lighting device. Fig. 5 shows another example of a circuit diagram of a lighting device. Fig. 6 shows another example of a circuit diagram of a lighting device.

[0046] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] The invention will be described with reference to the Figures.

[0048] It should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the apparatus, systems and methods, are intended for purposes of illustration only and are not intended to limit the scope of the invention. These and other features, aspects, and advantages of the apparatus, systems and methods of the present invention will become better understood from the following description, appended claims, and accompanying drawings. It should also be understood that the Figures are merely schematic and are not drawn to scale. It should also be understood that the same reference numerals are used throughout the Figures to indicate the same or similar parts.

[0049] Figure 1 shows an example of a circuit diagram of a lighting device. The lighting device has an energy storage device Bat. As an example, the energy storage device Bat may be a battery. The energy storage device Bat may also be any other kind of energy storage device such as a capacitor or a supercapacitor. Preferably, the energy storage device Bat is integrated in the lighting device. The energy storage device Bat is used for powering the electronic components in the lighting device. In this example, the energy storage device Bat is used for powering the controller 1. The controller 1 is used for providing a robust startup of the lighting device when a start-up command is provided by a user. Additionally, in this example, the controller 1 is used for turning on and off a light source LED. A startup component SI is placed between the energy storage device Bat and the controller 1. In this example, the startup component SI connects the Vcc input, which is the power input of the controller 1 to the energy storage device Bat. Therefore, closing the startup component SI provides an electrical connection from the energy storage device Bat to the power input Vcc of the controller 1. At a first initial moment in time, no electrical connection is present between the energy storage device Bat and any other component e.g., the controller 1. This means that the lighting device is inactive i.e., turned off. To turn on the lighting device, an electrical connection needs to be made between the energy storage device Bat and any other component e.g., the controller 1. The startup component SI is activated by a user. The startup component S 1 is a device that responds to an energy source that provides energy to the startup component SI in a wireless manner. In the example provided, the startup component SI is a reed switch. A reed switch reacts to a magnetic field. If the magnetic field is strong enough, the reed switch closes and creates an electrical connection. In this example, the electrical connection is created between the energy storage device Bat and the controller 1. This may be a temporary activation of the startup component SI by e.g. providing a short moment of time an external triggering energy. The activation of the reed switch allows a current to flow to the power input Vcc of the controller 1. The controller 1 can start up with this current. The current is used for charging any capacitance, parasitic or physical, at the power input Vcc. The start-up is defined by the starting up of the controller i.e., the voltage at the power input Vcc builds up to a value allowing the controller 1 to become fully active. The controller 1 provides a control signal to activate a shunt device. The shunt device has a first switching element Ml, which is shown as a P-MOSFET. If the first switching element Ml is closed, the shunt device provides an electrical connection between the energy storage device Bat and the power input Vcc. Therefore, regardless of a loss of electrical connection by the startup component SI, the shunt device provides a robust and reliable alternative electrical connection. The shunt device has a second switching element M2, which is shown as an N- MOSFET and is coupled between the gate of the first switching element Ml and a ground reference. A resistor R1 is provided between the gate and the source of the first switching element Ml. When the second switching element M2 is closed, a current will flow through the resistor R1 and cause a negative gate-source voltage at the first switching element Ml. This causes the first switching element Ml to be closed. Therefore, closing the second switching element M2 causes the first switching element Ml to be closed. After the start-up of the controller 1, the controller 1 sends a control signal to the gate of the second switching element M2. The controller 1 is therefore used to activate the shunt device directly after the start-up of the controller 1. By this configuration, the controller 1 is assured of a continuous connection to and a supply of power from the energy storage device Bat. The controller 1 can turn the lighting device in an off mode by removing the signal to the gate of the second switching element M2. The gate voltage of the second switching element M2 goes to zero, opening the second switching element M2 resulting in the first switching element Ml to be opened. In this event, the startup component SI is assumed to be deactivated. Therefore, no electrical connection is present between the energy storage device Bat and e.g. the controller 1, effectively turning off the lighting device. No power will be used by e.g. the controller 1 when the lighting device is turned off. As an example, the controller 1 may be prompted to turn off the shunt device, in this example by turning off the second switching element M2, by an external signal. The controller has a signal input Vreed for this purpose. Additionally, for this purpose, a diode DI is provided between the signal input Vreed and the power input Vcc. Activating, preferably temporarily, the startup component SI during operation of the controller 1, causes a signal pulse to be provided to the signal input Vreed. The controller 1 receives this signal and may use this for multiple purposes. One implementation may be that the signal is used for turning off the lighting device. Another implementation is that the signal is used for providing a different light output.

[0050] In this example, the controller 1 is further used for controlling the light source LED. For this purpose, the light source LED is coupled between a first output Outl and a second output Out2 of the controller 1. The controller 1 may be used to regulate a current through the light source LED. Upon receiving a signal from e.g. the startup component SI at the signal input Vreed, the controller 1 may change the amplitude of the current to the light source LED.

[0051] Figure 2 shows another example of a circuit diagram of a lighting device. The start-up circuitry is similar to that of the lighting device of Figure 1. A similar startup component SI may be used for triggering the start-up as described in Figure 1. The shunt device may also be identical having a first switching element Ml for providing the electrical connection between the energy storage device Bat and the controller 1. In this example, a current regulator 2 is provided to regulate the current to the light source LED. The current regulator 2 is a specific building block that is optimized for converting the voltage provided by the energy storage device Bat into a regulated current for the light source LED. This allows the light source LED to be powered in an energy efficient way. This allows the energy storage device Bat to provide power for a longer operating time of the lighting device or allows the energy storage device Bat to be reduced in volume for achieving a similar operation time of the lighting device. The current regulator 2 may be provided with power at the power input Vin. When the first switching element Ml is closed, the shunt device may provide power to the current regulator 2. Preferably, the controller 1 provides an enable signal to the current regulator 2. After start-up of the controller 1 and activation of the shunt device, the controller 1 can then enable the current regulator 2. At start-up, it is preferred to keep the current regulator 2 inactive to lower the power requirements for the startup component SI to start-up up the lighting device. If the current regulator 2 is not active at start-up, only the controller 1 requires power at start-up, therefore requiring a shortest time for the startup component SI to be activated as possible to speed up the start-up.

[0052] Figure 3 shows another example of a circuit diagram of a lighting device. The start-up circuitry is similar to that of the lighting device of Figure 1. A similar startup component SI may be used for triggering the start-up as described in Figure 1. The shunt device may also be identical having a first switching element Ml for providing the electrical connection between the energy storage device Bat and the controller 1. In this example, a wireless communication module 3 is provided. This allows the controller 1 to receive wireless signals from other devices. This allows other devices to provide control signals for regulating the current to through the light source LED. In this example, it may be preferred that the startup component SI during normal operation can be activated to provide a signal for the controller to turn off the shunt device and therefore the lighting device. The wireless communication module 3 may be provided with power at the power input VCC. When the first switching element Ml is closed, the shunt device may provide power to the wireless communication module 3. Preferably, the controller 1 provides an enable signal to the wireless communication module 3. This may be done over the communication line Data between the controller 1 and the wireless communication module 3. After start-up of the controller 1 and activation of the shunt device, the controller 1 can then enable the wireless communication module 3. At start-up, it is preferred to keep the wireless communication module 3 inactive to lower the power requirements for the startup component SI to start-up up the lighting device. If the wireless communication module 3 is not active at start-up, only the controller 1 requires power at start-up, therefore requiring a shortest time for the startup component SI to be activated as possible to speed up the start-up. The communication device 3 has an antenna that is coupled to an antenna input. The antenna is used for sending and / or receiving wireless data. The data may be provided to the controller 1 which in its turn may use this data for controlling the current through the light source LED. The data may also have a command for the controller for turning off the shunt device. Therefore, the wireless communication module 3 may be used to wirelessly turn off the lightning device.

[0053] Figure 4 shows another example of a circuit diagram of a lighting device. The start-up circuitry is similar to that of the lighting device of Figure 1. A similar startup component SI may be used for triggering the start-up as described in Figure 1. The shunt device may also be identical having a first switching element Ml for providing the electrical connection between the energy storage device Bat and the controller 1. Similar as in Figure 3, a wireless communication module 3 is provided to allow the lighting device to communicate with external devices. In addition, the lighting device has a current regulator 2 is provided to regulate the current to the light source LED. The current regulator 2 is a specific building block that is optimized for converting the voltage provided by the energy storage device Bat into a regulated current for the light source LED. This allows the light source LED to be powered in an energy efficient way. This allows the energy storage device Bat to provide power for a longer operating time of the lighting device or allows the energy storage device Bat to be reduced in volume for achieving a similar operation time of the lighting device.

[0054] The current regulator 2 and the wireless communication module 3 may be provided with power at their respective power inputs Vin and VCC. When the first switching element Ml is closed, the shunt device may provide power to the current regulator 2. Preferably, the controller 1 provides an enable signal to the current regulator 2 and to the wireless communication module 3. The wireless communication module 3 may be identical to that of the wireless communication device shown in Figure 3. After start-up of the controller 1 and activation of the shunt device, the controller 1 can then enable the current regulator 2 and the wireless communication module 3. At start-up, it is preferred to keep the current regulator 2 and the wireless communication module 3 inactive to lower the power requirements for the startup component SI to start-up up the lighting device. If the current regulator 2 and the wireless communication module 3 are not active at start-up, only the controller 1 requires power at start-up, therefore requiring a shortest time for the startup component SI to be activated as possible to speed up the start-up. In this example, the data may be provided to the controller 1 which in its turn provides an enable or control signal to the current regulator 2, which uses this signal for controlling the current through the light source LED. Alternatively, the wireless communication module 3 may directly provide a control signal to the current regulator 2.

[0055] Figure 5 shows another example of a circuit diagram of a lighting device. The start-up circuitry is similar to that of the lighting device of Figure 1. A similar startup component SI may be used for triggering the start-up as described in Figure 1. The shunt device may also be identical having a first switching element Ml for providing the electrical connection between the energy storage device Bat and the controller 1. Additionally, a controller 1 is provided and a wireless communication module 3. In addition, compared to the lighting device shown in Figure 4, a wireless charging module 4 is provided. The wireless charging module 3 has the purpose to charge the energy storage device Bat using wireless energy transfer. An example of such wireless energy transfer is the Qi charging technique. The wireless charging module 4 allows the energy storage device to be charged in a wireless way. Combined with the wireless communication device 3 and the startup component SI, all functionality of the lighting device can be addressed in a wireless manner. This allows the housing to be hermetically sealed, prevent any invasive material / gas to penetrate into the housing. The Lighting device is therefore more robust. Additionally, the lighting device can be placed in any location since it can operate as a standalone unit.

[0056] The wireless charging module 4 has a coil to receive an electromagnetic field and convert it into an electric current. In the example provided, the wireless charging module 4 receives power at the power input VCC. It may however be conceived that the power to the wireless charging module 4 is provided by the current provided by the coil. The coil may be coupled to the input ANTI and therefore the generated current is provided to the wireless charging module 4 via the input ANTI. This current can be used to power the wireless charging module 4. This may further provide an energy saving because during normal operation, no power is provided from the energy storage device Bat to the wireless charging module 4. In an example, the wireless charging module 4 may only be activated when in close proximity with a charger pad. The energy received then also automatically activates the wireless charging module 4. As a very simplistic representation, a diode D3 shows the charging path from the wireless charging module 4 output PWR to the energy storage device Bat. Additional circuitry may be present to provide a safe charging of the energy storage device Bat.

[0057] Figure 6 shows another example of a circuit diagram of a lighting device. The lighting device has the same features as provided in the lighting device of Figure 5. In addition, a current regulator 2 is provided to regulate the current to the light source LED. The current regulator 2 is a specific building block that is optimized for converting the voltage provided by the energy storage device Bat into a regulated current for the light source LED. This allows the light source LED to be powered in an energy efficient way. This allows the energy storage device Bat to provide power for a longer operating time of the lighting device or allows the energy storage device Bat to be reduced in volume for achieving a similar operation time of the lighting device. The current regulator 2 may be provided with power at the power input Vin. When the first switching element Ml is closed, the shunt device may provide power to the current regulator 2.

[0058] Preferably, the controller 1 provides an enable signal to the current regulator 2. After start-up of the controller 1 and activation of the shunt device, the controller 1 can then enable the current regulator 2. At start-up, it is preferred to keep the current regulator 2 inactive to lower the power requirements for the startup component SI to start-up up the lighting device. If the current regulator 2 is not active at start-up, only the controller 1 requires power at start-up, therefore requiring a shortest time for the startup component S 1 to be activated as possible to speed up the start-up.

[0059] As an option, when the lighting device is being charged via the wireless charging module 4, the current regulator 2 is deactivated and therefore no power is used by the current regulator 2 and the light source LED. This allows the charging of the energy storage device Bat to be faster. Additionally, the controller 1 may disable the wireless communication module 3 during the charging, further speeding up the charging of the energy storage device Bat.

[0060] If the charging of the energy storage device does not need to be fast, additional functionality may be enabled during charging. Leaving the current regulator 2 enabled allows light to be emitted during charging. Leaving the wireless communication device active during charging allows the wireless communication to be used. This may e.g., allow the progress of charging to be followed.

[0061] In the examples provided, the light source may be any of a low power light source. Preferably, the light source is an LED light source that allows a high light output, while using a low amount of power. The LED light source may have multiple LEDs, which may generate colour light. As an example, the LEDs may emit red, green and blue light. The LEDs may also have a phosphor coating that allows white light to be emitted. Multiple LEDs with different phosphor coatings may be used to provide different colour temperatures.

[0062] In the examples provided, the controller 1, the current regulator 2, the wireless communication module 3 and the wireless charging module 4 are shown as separate building blocks. These building blocks represent different functions and could all be integrated in a single Application Specific Integrated Circuit, ASIC or a microcontroller. Alternative design options are possible, depending on the use and form factor of the lighting device.

[0063] In the examples provided, the current regulator 2 is preferably a Switched Mode Power Supply, SMPS. Examples of a SMPS types are: buck converter, boost converter, flyback converter or a resonant converter. The type of SMPS may be chosen depending of the voltage provided by the energy storage device.

[0064] In the examples provided, the startup component SI is a reed switch. The startup component SI may also be another type of device that translates a wireless energy transfer into an electrical connection. In addition to the receiving element, the startup component SI may have additional electrical components to translate the received energy into an electrical connection. Examples of such receiving element may be e.g., an optical sensor, an NFC module, a magnetic sensor, a capacitive sensor, proximity sensor, pressure sensors, using temperature with e.g. a bi-metal contact or using an RF signal with a narrow band for selectivity.

[0065] Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope.

Claims

CLAIMS:

1. A lighting device comprising: an energy storage device (Bat); a light source (LED); a controller (1) for controlling the light source (LED); a startup component (SI) coupled between the energy storage device (Bat) and the controller (1) and adapted to provide a start-up power to the controller (1) upon an activation of the startup component (SI) by creating an electrical connection between the energy storage device (Bat) and the controller (1), and a shunt device coupled between the energy storage device (Bat) and the controller (1), wherein the controller (1) is arranged to activate the shunt device after the start-up to shunt the startup component (SI).

2. The lighting device according to claim 1, wherein the startup component (SI) is arranged to provide a temporary electric connection between the energy storage device (Bat) and the controller (1) upon activation of the startup component (SI) by an event external to the lighting device.

3. The lighting device according to any of the preceding claims, further comprising a current regulator (2) for controlling a current to the light source (LED).

4. The lighting device according to any of the preceding claims, further comprising a wireless communication module (3) arranged to receive wireless signals for controlling the light source (LED).

5. The lighting device according to any of the preceding claims, further comprising a wireless charging module (4) arranged for charging the energy storage device (Bat) wirelessly using a wireless charging signal.

6. The lighting device according to claim 5, wherein the wireless charging module (4) is arranged to be powered from wireless charging signal.

7. The lighting device according to any of the preceding claims, wherein the controller (1) comprises a signal input (Vreed) for receiving a signal, wherein upon activation of the startup component (SI), a signal is provided to the signal input (Vreed).

8. The lighting device according to claim 7, wherein the controller (1) is arranged to turn off the shunt device upon receiving the signal.

9. The lighting device according to any of the preceding claims, wherein the light source (LED) comprises a plurality of color LEDs.

10. The lighting device according to any of the preceding claims, further comprising a housing, wherein the housing is arranged to hermetically enclose the energy storage device (Bat), the light source (LED), the controller (1), the startup component (SI) and the shunt device.

11. The lighting device according to any of the preceding claims, further comprising a magnet.

12. The lighting device according to any of the preceding claims, wherein the startup component (SI) comprises an electric circuit adapted to, upon receiving a non-electric energy, provide the electrical connection between the energy storage device (Bat) and the controller (1).

13. The lighting device according to any of the claims 1 to 11, wherein the startup component (SI) is a reed switch.

14. A lighting system comprising:A plurality of lighting devices according to any of the claims 4 or 5 to 13 when depending on claim 4, andA hub adapted to provide a wireless communication link between a user interface and the plurality of lighting devices.

15. A lighting system comprising a plurality of lighting devices according to any of the claims 4 or 5 to 13 when depending on claim 4, wherein the lighting devices are arranged to form a wireless mesh network.

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