WO2007062455A1 - Lighting system and method - Google Patents

Lighting system and method

Info

Publication number
WO2007062455A1
WO2007062455A1 PCT/AU2006/001779 AU2006001779W WO2007062455A1 WO 2007062455 A1 WO2007062455 A1 WO 2007062455A1 AU 2006001779 W AU2006001779 W AU 2006001779W WO 2007062455 A1 WO2007062455 A1 WO 2007062455A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
lighting
luminaire
element
means
electrical
Prior art date
Application number
PCT/AU2006/001779
Other languages
French (fr)
Inventor
Peter Ward
Original Assignee
Spa Electrics Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/85Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • F21V29/89Metals
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00Lighting devices intended for fixed installation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00Safety devices structurally associated with lighting devices
    • F21V25/10Safety devices structurally associated with lighting devices coming into action when lighting device is overloaded, e.g. thermal switch
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F21V23/0442Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40Lighting for industrial, commercial, recreational or military use
    • F21W2131/401Lighting for industrial, commercial, recreational or military use for swimming pools
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00Illumination
    • Y10S362/80Light emitting diode

Abstract

An underwater luminaire including a lighting element in thermal communication with a heat dissipating means, the heat dissipating means (35) being configured to dissipate heat through water surrounding the luminaire, the heat dissipating means being associated with an electrical power limiting means (58) that includes a temperature detector (59) wherein the electrical power limiting means limits the electrical power supplied to the lighting element in the event the temperature detector indicates a temperature that exceeds a predetermined limit.

Description

LIGHTING SYSTEM AND METHOD

FIELD OF THE INVENTION

The present invention relates generally to luminaires and is particularly well suited to a luminaire that is to be installed in a location that is either difficult or inconvenient to access for the purpose of replacing a lighting element associated with the luminaire.

BACKGROUND OF THE INVENTION

Luminaires have been known and used for many years and act provide both functional and decorative features with respect to the lighting element contained within. In some countries, luminaires are referred to as light housings or light fixtures, but they all effectively incorporate a functionality to provide electrical power to a lighting element or source contained within. Luminaires generally comprise a means for receiving a lighting element, a housing and a lens arrangement through which light energy is distributed from the lighting element to the surrounding environment. Commonly, the lens arrangement acts to diffuse any light that is emitted from the lighting element.

Luminaires are usually configured to be relatively easy to dismantle in order to replace the lighting element in the event that same becomes defective or reaches the end of its useful operating life. Further, luminaires are generally configured to receive either an incandescent or fluorescent lighting element as these lighting elements represent a relatively inexpensive option for the purpose of providing electrically powered lighting. Although incandescent and/or fluorescent lighting elements are relatively inexpensive, their effective operating life is usually less than the expected life of a luminaire. Accordingly, it is generally necessary to replace a lighting element at least once, and usually more often, during the operational life of a luminaire.

Where a luminaire is located in an inconvenient location, such as underwater, the replacement of a lighting element becomes particularly problematic. In the instance of a luminaire that is configured to operate underwater, it is usual to install the luminaire with an additional sufficient length of wiring to enable the luminaire to be removed from its location and withdrawn to a position above water level such that the lighting element may be replaced without risk of ingress of water into the luminaire housing.

Accordingly, it is advantageous to provide a luminaire with a lighting element having an operational life that exceeds the expected life of the luminaire or that is at least long relative to the expected life of the luminaire. The provision of a luminaire with a lighting element having at least a relatively long operational life expectancy may reduce the frequency with which an operator must replace the lighting element.

Any discussion of documents, devices, acts or knowledge in this specification is included to explain the context of the invention. It should not be taken as an admission that any of the material formed part of the prior art base or the common general knowledge in the relevant field of technology on or before the priority date of the claims herein.

SUMMARY OF THE INVENTION The present invention may provide a luminaire with a lighting element that has a relatively long operational life expectancy, whilst at the same time ameliorating potential damage to remaining components of the luminaire.

Accordingly, in one aspect, the present invention provides an underwater luminaire including a lighting element in thermal communication with a heat dissipating means, the heat dissipating means being configured to dissipate heat through water surrounding the luminaire, the heat dissipating means being associated with an electrical power limiting means that includes a temperature detector wherein the electrical power limiting means limits the electrical power supplied to the lighting element in the event the temperature detector indicates a temperature that exceeds a predetermined limit.

In a preferred embodiment, the heat dissipating means includes a metallic component thus effectively forming a heat sink that is in thermal communication with the lighting element. The metallic component may act to draw heat away from the lighting element to keep it within operating temperatures that avoid damage to other components of the luminaire. In a particularly preferred embodiment, the metallic component forming the heat dissipating means includes a material to avoid corrosion of the heat dissipating means. In a particularly preferred embodiment, the heat dissipating means is made from aluminium which is anodised to resist corrosion.

The shape and size of the heat dissipating means may be configured to suit the environment in which the luminaire is intended to operate. In an embodiment of the invention, the heat dissipating means may be configured to take advantage of expected water flow in an immediate vicinity of the luminaire. Of course, where the luminaire consists of various parts, the luminaire will preferably include sealing means in order to prevent ingress of water into those components of the luminaire that should remain dry. The latter includes a region in which the lighting element or source is in electrical communication with electrical wiring that provides electrical power to the luminaire. In such an embodiment, the heat dissipating means preferably extends from within the dry region of the luminaire and passes through a wall of the luminaire housing to facilitate thermal communication with both the lighting element and the surrounding water. Alternatively, the heat dissipating means may be configured to form a portion of the housing that encapsulates the dry region with the portion of the housing being in direct contact with the surrounding water.

However, despite dissipation of thermal energy from the lighting element to the surrounding environment, the temperature of the lighting element may increase to a level that exceeds a safe operating temperature with respect to remaining components of the luminaire. In this instance, the electrical power limiting means may act to limit supply of electrical power to the lighting element to retain the temperature of same within safe operating limits. Ultimately, the temperature level that may be considered "safe" will depend upon the particular embodiment of the luminaire and in particular, the materials used in manufacture of remaining components of the luminaire. For example, some materials will resist relatively high temperatures whereas others may melt or discolour as a result of the lighting element operating above a relatively low temperature. Therefore, depending upon the materials used for the manufacture of the remaining components of the luminaire, a "safe" operating temperature of the lighting element should be established and preferably, upon detecting a temperature within the luminaire that exceeds this safe limit, the electrical power limiting means may limit electrical power supplied to the lighting element.

In a preferred embodiment, the temperature within the luminaire is obtained by measuring the temperature of the heat dissipating means. The temperature detector may be in thermal communication with the heat dissipating means. Electrical power may be gradually limited in the event that the temperature of the heat dissipating means exceeds a predetermined limit. Of course, the temperature of the heat dissipating means corresponding to an "unsafe" temperature within the luminaire will depend upon the thermodynamic properties of the heat dissipating means. However, for any particular embodiment of a luminaire and heat dissipating means it should be a relatively straightforward task to determine the temperature of the heat dissipating means that corresponds to an onset of damage to components of the luminaire.

Gradual limiting of electrical power may be effected until such time as the temperature of the heat dissipating means is sufficiently reduced below the predefined "safe" temperature for the luminaire. In another embodiment, the electrical power supplied to the lighting element may be disconnected until such time as a safe temperature of the heat dissipating means is detected. In yet another embodiment, the electrical power supplied to the lighting element may be repeatedly disconnected and reconnected in accordance with a predefined duty cycle in an attempt to reduce the temperature of the heat dissipating means to a safe level. The duty cycle of application of electrical power to the lighting element may vary in accordance with a difference between detected temperature of the heat dissipating means and a safe temperature for the luminaire. In yet another embodiment, the electrical power limiting means may act to disconnect and reconnect electrical power to the lighting element to cause a noticeable "flashing" of the lighting element. The latter may reduce temperature of the heat dissipating means and provide a visual warning that an unsafe temperature has been detected. In preferred embodiments, the electrical power limiting means may act to regulate electrical current supplied to the lighting element to effect a reduction in electrical power. The lighting element preferably includes one or more light emitting diodes (LED's) to provide a relatively long operational life. In this respect, it is particularly preferred to use a LED lighting element utilizing ceramic on metal packaging such as those manufactured by Lamina Ceramics Inc., Westhampton, New Jersey, United States. The electrical power limiting means preferably receives signals from a silicon diode that represents a temperature of the heat dissipating means connected to the heat dissipating means, said signals acting as an input to the electrical power limiting means. The signals from the silicon diode may be indicative of the temperature of the heat dissipating means and in the event that the detected temperature exceeds a predetermined limit, the electrical current control circuitry may act to reduce the supply of electric current to the lighting element. Further, the electrical power limiting means preferably includes a switch mode regulator device to which the input signal is provided, the switch mode regulator device controlling the electrical current supplied to the lighting element depending upon the signal from the silicon diode. Further benefits and advantages of a luminaire according to the present invention will become apparent in the following description of a preferred embodiment of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

A preferred embodiment of the invention will now be described. The preferred embodiment should not be considered as limiting any of the statements in the previous section. The preferred embodiment will be described with reference to the following figures in which:

Figure 1 is an "exploded" diagram of a luminaire detailing the major components including a heat dissipating means; Figure 2 is a sectioned side view of the luminaire of figure 1 in its assembled form; and

Figure 3 is a simplified electrical circuit diagram of an electrical power limiting means according to the present invention.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT With reference to Figure 1 , an exploded view of a luminaire is provided.

The major components of the luminaire include the base 10 including a mounting plate 15 and base plate 20 to which mounting components 25 of the lighting element are firmly attached. The mounting components include a mounting ring 30, a heat dissipating base plate 35 and a heat dissipating lighting element retainer 40.

The luminaire also includes an external mounting ring 45, an intermediate mounting ring 50 and a lens cover 55.

In its assembled form, the heat dissipating base plate 35 is firmly attached and in thermal communication with the heat dissipating lighting element retainer 40. The lighting element retainer 40 includes "fingers" 42 that firmly grasp an external surface of a lighting element (not shown herein) that is installed into the luminaire, thus retaining a firm physical connection therebetween. Of course, in order to retain good thermal communication between the lighting element and the lighting element retainer 40, the fingers 42 are made of a material that exhibits good thermal conducting properties.

In most embodiments, it is expected that the fingers 42, the lighting element retainer 40 and the base plate 35 will be constructed from the same or similar material exhibiting good thermal conductive properties.

With reference to Figure 2, a sectional side view of the luminaire of Figure 1 is detailed wherein the parts of the luminaire identified in Figure 1 are likewise identified in Figure 2 with the same identification numbering. As the sectional side view of Figure 2 details the luminaire of Figure 1 in its assembled form, it can be readily seen that the heat dissipating base plate 35 effectively forms an external surface of the luminaire. The embodiment of the luminaire detailed in Figures 1 and 2 is particularly suited for insulation of the luminaire in an underwater application and in this instance, the external surface of the heat dissipating base plate 35 is in direct contact with the surrounding water and in accordance with the fundamental principles of thermodynamics, the temperature of the heat dissipating base plate 35 and the surrounding water attempt to reach thermal equilibrium which in the vast majority of instances will result in passage of thermal energy from the heat dissipating base plate 35 to the surrounding water. As the heat dissipating base plate 35, the heat dissipating lighting element retainer 40 and the fingers 42 are all in thermal communication with the lighting element (not detailed herein), thermal energy generated by the lighting element effectively passes from the lighting element to the surrounding water, such that the surrounding water effectively acts to keep the lighting element cool.

However, despite the best attempts to configure the heat dissipating means to keep the lighting element operating at a safe temperature for the remaining components of the luminaire, it is possible that there will be instances where the surrounding environment is not capable of removing sufficient thermal energy from the lighting element to maintain the lighting element operating at a safe temperature. Accordingly, the present invention also includes an electrical power limiting means for limiting the electrical power supplied to the lighting element. In a preferred embodiment of the invention, the electrical power limiting means includes the electrical circuit arrangement as detailed in Figure 3.

With reference to Figure 3, a simplified electrical circuit diagram of an electrical power limiting means 58 is provided. As will be noted by those of relevant skill in the art, the function of the electrical circuit of Figure 3 is based upon the use of a switch mode regulator device (U1 ) for controlling electrical current provided to a lighting element D7. The input signal to the electrical circuit arrangement of Figure 3 is provided by a silicon diode 59 that senses temperature and is thermally connected to the heat dissipating base plate 35. The anode and the cathode of the silicon diode connected to the heat dissipating base plate 35 are electrically connected to terminals 60 and 65 respectively.

The switch mode regulator device U1 , has two inputs (pins 1 and 2 of the device) to internal operational amplifiers. The internal operational amplifiers connected to pins 1 and 2 of device U1 are used to control a supply of electrical current to the lighting element D7. The device U1 also includes two operational amplifiers the inputs of which are connected to pins 15 and 16 of the device.

The operational amplifiers with input connections at pins 15 and 16 of the device are used to control temperature of the lighting element by controlling a duty cycle of switching transistor Q2.

The switching frequency of the switch mode regulator device U1 is established by the time constant of the passive components resistor R9 and capacitor C5. The output of the device U1 (pins 9 and 10) are connected to the gate of MosFet transistor Q2 which controls average current passing through inductor L1 and hence the average electrical current passing through the lighting element D7.

Resistors R5, R6, R7 and R8 are used for "level shifting" of the current sensor voltage that exists across current sensing resistor R1 1 . The selection of resistor R8 allows the operating current to be chosen. Capacitor C2 controls loop time constant and loop stability. The input supply voltage (VCC) can be in the range of 12 to 24V dc.

The temperature of the heat dissipating base plate 35 is sensed by power transistor Q1 the emitter of which is connected to resistor R3 through which a small current passes such that in the event that the voltage across resistor R3 falls below a setting of the voltage divider consisting of resistors R1 and R2, the electrical power supplied to the lighting element D7 is reduced. A reduction in the electrical power supplied to the lighting element D7 may occur if there was a fault in the heat dissipating arrangement. The latter may arise if the luminaire is operated without sufficient surrounding water or in the event that free movement of water around the luminaire is prevented.

The provision of resistor R4 results in a gradual reduction of electrical power supplied to the lighting element D7. However, if resistor R4 is omitted, the lighting element D7 will "flash" on and off thus reducing the thermal energy generated by the lighting element and at the same time providing a visual indication that an unsafe temperature level has been detected.

The present invention protects luminaire components by monitoring and avoiding generation of unsafe temperature levels within the luminaire. This is particularly advantageous for luminaires that are intended to operate underwater wherein they may be operated in dry environments for the purpose of display or presentation. In this instance, a lack of "cooling water" surrounding the luminaire will most likely result in generation of unsafe temperatures which in turn will be limited by action of the electrical power limiting means. Accordingly, luminaires in accordance with the present invention may be activated for display purposes without the usual concern of causing damage to the luminaire. As the present invention may be embodied in several forms without departing from the essential characteristics, it should be understood that the above described embodiment should not be considered to limit the present invention but rather should be construed broadly within the spirit and scope of the invention. Various modifications and equivalent arrangements are intended to be included within the spirit and scope of the invention.

Claims

1 . An underwater luminaire including a lighting element in thermal communication with a heat dissipating means, the heat dissipating means being configured to dissipate heat through water surrounding the luminaire, the heat dissipating means being associated with an electrical power limiting means that includes a temperature detector wherein the electrical power limiting means limits the electrical power supply to the lighting element in the event the temperature detector indicates a temperature that exceeds a predetermined limit.
2. A luminaire according to claim 1 wherein the heat dissipating means includes a metallic component thus effectively forming a heat sink that is in thermal communication with the lighting element.
3. A luminaire according to claim 2, wherein the metallic component forming the heat dissipating means includes a material to avoid corrosion of the heat dissipating means.
4. A luminaire according to claim 3, wherein the heat dissipating means is made from aluminium which is anodised to resist corrosion.
5. A luminaire according to claim 1 , and further including a dry region in which the lighting element or source is in electrical communication with electrical wiring that provides electrical power to the luminaire.
6. A luminaire according to claim 5, wherein the heat dissipating means extends from within the dry region of the luminaire and passes through a wall of the luminaire housing to facilitate thermal communication with both the lighting element and the surrounding water.
7. A luminaire according to claim 5, wherein the heat dissipating means is configured to form a portion of the luminaire housing that encapsulates the dry region with the portion of the housing being in direct contact with the surrounding water.
8. A luminaire according to claim 1 , wherein the electrical power limiting means is configured to gradually limit the electrical power supply until such time as the temperature of the heat dissipating means is reduced below a predefined safe temperature for the luminaire.
9. A luminaire according to claim 1 , wherein the electrical power limiting means is configured to disconnect the electrical power supplied to the lighting element until such time as a safe temperature of the heat dissipating means is detected.
10. A luminaire according to claim 1 , wherein the electrical power limiting means is configured to repeatedly disconnect and reconnect the electrical power supplied to the lighting element in accordance with a predefined duty cycle in an attempt to reduce the temperature of the heat dissipating means to a safe level.
1 1 . A luminaire according to claim 1 , wherein the electrical power limiting means is configured to vary the duty cycle of application of electrical power to the lighting element in accordance with a difference between detected temperature of the heat dissipating means and a safe temperature for the luminaire.
12. A luminaire according to claim 1 , wherein the electrical power limiting means acts to disconnect and reconnect electrical power to the lighting element to cause a noticeable flashing of the lighting element.
13. A luminaire according to claim 1 , wherein the electrical power limiting means acts to regulate electrical current supplied to the lighting element to effect a reduction in electrical power.
14. A luminaire according claim 1 wherein the temperature detector is in thermal communication with the heat dissipating means.
15. A luminaire according to claim 14 wherein the temperature detector includes a silicon diode that is in electrical communication with an electrical circuit that controls the supply of electrical current to at least one lighting element of the luminaire.
16. A luminaire according to claim 15 wherein the electrical current control circuit receives signals from the silicon diode indicating the temperature of the heat dissipating means and in the event that the detected temperature exceeds a predetermined limit, the electrical current control circuitry acts to reduce the supply of electrical current to the lighting element.
17. A luminaire according to claim 16, wherein the electrical power limiting means includes a switch mode regulator device to which the input signal is provided, the switch mode regulator device controlling the electrical current supplied to the lighting element depending upon the signal from the silicon diode.
PCT/AU2006/001779 2005-12-01 2006-11-24 Lighting system and method WO2007062455A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2005906782 2005-12-01
AU2005906782 2005-12-01

Publications (1)

Publication Number Publication Date
WO2007062455A1 true true WO2007062455A1 (en) 2007-06-07

Family

ID=38091785

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2006/001779 WO2007062455A1 (en) 2005-12-01 2006-11-24 Lighting system and method

Country Status (1)

Country Link
WO (1) WO2007062455A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2006601A2 (en) * 2007-06-21 2008-12-24 Oase GmbH Headlamp unit and fountain
DE102015115947A1 (en) * 2015-09-22 2017-03-23 Mts Produkte Für Den Schwimmbadbau Und Die Unterwassertechnik Gmbh Underwater light

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003178602A (en) * 2001-12-10 2003-06-27 Koito Mfg Co Ltd Lighting system
WO2004038290A1 (en) * 2002-10-28 2004-05-06 Dialight Corporation Led illuminated lamp with thermoelectric heat management
DE202004013308U1 (en) * 2004-05-07 2004-11-11 Savage Marine Ltd., Hinckley Underwater Lighting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003178602A (en) * 2001-12-10 2003-06-27 Koito Mfg Co Ltd Lighting system
WO2004038290A1 (en) * 2002-10-28 2004-05-06 Dialight Corporation Led illuminated lamp with thermoelectric heat management
DE202004013308U1 (en) * 2004-05-07 2004-11-11 Savage Marine Ltd., Hinckley Underwater Lighting

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2006601A2 (en) * 2007-06-21 2008-12-24 Oase GmbH Headlamp unit and fountain
US8167446B2 (en) 2007-06-21 2012-05-01 Oase Gmbh Spotlight and water fountain
DE102015115947A1 (en) * 2015-09-22 2017-03-23 Mts Produkte Für Den Schwimmbadbau Und Die Unterwassertechnik Gmbh Underwater light

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