ITFI20120246A1 - "LIGHTING SYSTEM AND ITS COMPONENTS" - Google Patents

Description

"Lighting system and its components"

Description

Technical field

The present invention relates to the lighting industry. More particularly, the invention relates to a new lighting system using LEDs as light sources.

State of the art

The lighting sector is increasingly moving towards systems that are able to optimize energy consumption, increase reliability and improve the color rendering of the lighting bodies.

These aims are currently being pursued with the use of LED technology (light emitting diode). Recent developments in the LED lighting sector make it possible to obtain a reduction in consumption of about 10 times compared to traditional incandescent lamps and about 50% compared to discharge lamps (so-called neon tubes). From the point of view of reliability, LEDs have a much longer useful life than traditional lighting bodies. Even from the point of view of light quality (CRI = Color Rendering Index), LEDs guarantee the maximum performance obtainable in the lighting sector.

However, the use of LEDs also has some drawbacks. In particular these devices require a power control with dedicated power supplies. Furthermore, LEDs are point light sources, which therefore tend to glare due to the high density of light emitted. Optical diffusion and reflection systems have been studied to overcome this problem. So-called remote phosphor systems have also been studied, i.e. materials that, applied to a support placed at a distance from the LED, convert the radiation emitted by the LED into visible light not directly on the LED, but at a distance from it such that the emitting surface it is more extended and the light emitted less concentrated.

WO 2011/103204 discloses a lighting system which makes use of LED strips which excite a light emitting substance applied remotely from the LED strip, so as to obtain an improved distribution of the light radiation.

Summary of the invention

According to one aspect, the invention relates to an LED lighting body comprising an elongated housing with a back wall and an opposing opening extending along the longitudinal development of the housing; in which an electronic board is arranged inside the housing, equipped with a plurality of LEDs distributed along the longitudinal development of the housing and facing the opening of the housing; and in which a laminar screen is housed in said opening which closes said opening and on which a photoluminescent material is applied, which modifies the spectrum of the radiation of the LEDs.

The lighting body in question can be sized to replace the normal fluorescent tubes. For example, the housing can be elongated, with transverse dimensions substantially equivalent to the diametrical dimension of a fluorescent tube. In this way the lighting body can be inserted in place of a fluorescent tube in an existing ceiling light.

According to a different aspect, the invention relates to a lighting system comprising:

a plurality of groups of lighting bodies, each of said groups of lighting bodies comprising one or more lighting bodies and each lighting body comprising one or more remote phosphor LEDs;

for each group of lighting fixtures, a power supply and control circuit and a modem for conveyed wave transmission (or so-called PLM: Power Line Modem), or another communication system, to communicate with the power supply and control circuits of other groups of lighting fixtures via an electrical distribution network;

wherein at least one of said power supply and control circuits is associated with at least one sensor which generates at least one signal used by the power supply and control circuit for driving the lighting bodies. The lighting system can advantageously comprise LED lighting bodies of the type defined above. In other embodiments, lighting bodies of other shapes can be used.

In some embodiments, one of the power and control circuits is programmed as a master and the remaining power and control circuits are programmed as a slave. One or more of said power supply and control circuits can be associated with one or more sensors. For example, a power supply and control circuit can be equipped with all the sensors and the other power supply and control circuits can be without sensors. Alternatively, several power supply and control circuits of the system can be equipped with sensors, with configurations that are all the same or even different from each other with sensors. In some embodiments each group of lighting bodies has a control and power supply circuit and one or more sensors. The control and power supply circuits can be programmed to work alternately as a master or as a slave, even independently of the presence of sensors. In other words, power supply and control circuits equipped with sensors can also be programmed as slave units which, in this case, may not be used or only partially used.

In some embodiments, a single control and power circuit can be provided to function as the master, sending through the transceiver device (e.g. the PLM modem) instructions, information or commands to the other control and power circuits to drive or control the respective lighting bodies. It can be assumed that the power supply and control circuit that operates as the master receives information only from sensors directly associated with it. However, the possibility is not ruled out that a single control and power supply circuit programmed to operate as master receives data also (or exclusively) from sensors associated or interfaced with other power supply and control circuits, programmed to function as a slave. The number of sensors used and their location can for example be modified through suitable programming of the individual control and power supply circuits, for example in order to adapt the operation of the lighting system to a specific environment and / or to modify the operation of the system based on the customer's needs, on the different intended use of the environment, or on the occurrence of needs that vary over time compared to those on the basis of which the system was programmed for the first time.

Further advantageous features and embodiments of the invention are illustrated below with reference to examples of execution and defined in the attached claims, which form an integral part of this description.

Brief description of the drawings

The invention will be better understood by following the description and the accompanying drawings, which show practical non-limiting embodiments of the invention. More specifically, in the drawing they show: the

Figs.1 and 2 show two diagrams of a lighting system according to the invention in two embodiments; there

Fig.3 shows a schematic plan view of an illuminated room with ceiling lights which realize a system according to the invention in a possible configuration; there

Fig.4 illustrates a schematic front view of a ceiling light in a possible embodiment; there

Fig.4A is a local section according to A-A of Fig.4; the

Figs.5 and 6 show a lighting body, respectively in a transverse section according to V-V of Fig.6 and in a side view according to VI-VI of Fig.5; Fig.7 shows a cross section of the section forming the housing of the lighting bodies; and the

Figs 8 and 9 show axonometric views of the end covers of the housing of the lighting bodies.

Detailed description of embodiments of the invention

The following detailed description of exemplary embodiments refers to the accompanying drawings. The same reference numerals in different drawings identify the same or similar elements. Furthermore, the drawings are not necessarily to scale. The following detailed description does not limit the invention. Rather, the scope of the invention is defined by the attached claims.

Reference in the description to "an embodiment" or "the embodiment" or "some embodiment" means that a particular feature, structure or element described in connection with an embodiment is included in at least one embodiment of the described object. Therefore the phrase "in an embodiment" or "in the embodiment" or "in some embodiment" at various points along the description does not necessarily refer to the same or the same embodiments. Furthermore, the particular features, structures or elements can be combined in any suitable way in one or more embodiments.

In the following, a lighting system is described comprising LED lighting bodies which can be combined in groups, for example, which can be mounted in respective ceiling lights. The possibility is not excluded that each group or some of the groups of lighting fixtures have only one lighting fixture and may possibly be without a ceiling light. A possible configuration of a ceiling light and a possible configuration of a lighting body are also described below. It must be understood that the lighting system can also comprise ceiling lamps of different structures and / or lighting bodies other than those described and illustrated. It should also be understood that the lighting bodies described below and illustrated in the drawings can be used advantageously in different lighting systems, or even individually, for example in replacement of single fluorescent tubes or other traditional type lighting bodies.

Figures 1 to 3 schematically show a simplified embodiment of a lighting system that uses LED lighting bodies.

Fig. 3 shows by way of example a plan view of a room 1 with windows 3 and an access door 5. In the room there are four ceiling lights 7, indicated with 7A, 7B, 7C, 7D, containing lighting bodies made with LEDs and combined with so-called remote phosphors, for example according to a configuration that will be described in greater detail below.

The 7A-7D ceiling lights are connected to an electrical distribution network schematically indicated by 9. The electrical distribution network 9 can also be used for the exchange of data between the lighting bodies and / or the individual 7A-7D ceiling lights, by means of a system with conveyed waves and a PLM (Power Line Modem) on each 7A-7D ceiling light or on each luminaire mounted on the ceiling lights.

Fig.1 schematically shows a generic ceiling light 7 connected to the electrical distribution network 9. The ceiling light 7 of Fig.1 can be any of the ceiling lights 7A-7D of the system schematically illustrated in Fig.3.

In the diagram of Fig.1 at the inside of the ceiling light 7 are mounted lighting bodies 13, each comprising a plurality of LEDs, for example arranged according to a linear matrix. Each lighting body includes, in addition to the LEDs which constitute the sources of electromagnetic radiation, also the power supply and control system.

As will be illustrated below, the ceiling light can have any number of lighting bodies 13, arranged in according to suitable configurations. In the diagram of Fig.1, six lighting bodies 13 are provided side by side. In other embodiments, a different number of lighting bodies may be provided, for example from one to 12, in Fig.3 four lighting bodies 13 are schematically illustrated for each ceiling light 7A-7D. As can already be understood from the comparison between Figs. 1 and 2, the geometric arrangement of the lighting bodies 13 in the ceiling lamp 7, 7A-7D can vary, both according to the number and / or the shape or size of the lighting bodies and / or the shape and / or size of the ceiling lamp, as well as based on technical lighting considerations.

In the diagram of Fig.1 the generic ceiling light 7 comprises a power supply and control circuit 15 connected to the individual LED lighting bodies 13 and forming a control unit. In practice, each lighting body 13 comprises an electronic board on which the individual LEDs are mounted, for example aligned according to the longitudinal development of the lighting body 13.

In the diagram of Fig. 1, 17 schematically indicates a control line that connects the circuit 15 to the individual electronic boards of the lighting bodies 13. 19 indicates a direct current low voltage power supply line with which the LEDs mounted in the light fixtures 13. In some embodiments the line 17 can be omitted. The control of the LED emission can take place by piloting by means of the power supply voltage on line 19.

In some embodiments, the control and power supply circuit 15 is associated with a PLM (Power Line Modem or power line modem) schematically indicated by 21. H PLM 21 and the power supply and control circuit 15 are connected via a power supply line 23 to the electrical distribution network 9. The PLM 21 can transmit and / or receive data via conveyed waves transmitted along the line 23 and the electrical distribution network 9, to communicate with the other ceiling lights of the system and / or with variously distributed units for example inside the building where room 1 is located.

Power line communication is particularly efficient, as it reduces the wiring required and avoids the need to use wireless transmission systems, which can lead to electromagnetic interference and / or pollution problems.

However, it is not excluded that in other embodiments the communication may take place with other systems. In some embodiments, a wired transmission system via RS485 protocol can be used. In other embodiments, wireless transmission systems can be used, for example using ZigBee, Bluetooth, Wifi or other proprietary protocols. In these embodiments, corresponding transceiver devices are associated with the individual control and power supply circuits.

The possibility of using mixed systems is not excluded.

As an example, the diagram of Fig.1 shows a controller 25 which can be connected through a line 27 to the electrical distribution network 9. A PLM 29 allows the controller 25 to communicate, through the lines 27, 23 and the distribution network 9, with the ceiling light 7 and / or with the other ceiling lights 7A-7D of the lighting system.

In some embodiments, the lighting system comprising the components described up to now can be integrated into an existing home automation system. 31 schematically indicates a control unit of a standard home automation system. The connection between the controller 25 and the control unit 31 can take place through a dedicated line, for example a serial line 33, or through conveyed waves using the same electrical distribution network 9.

The controller 25 can be connected extemporaneously or can be permanently connected to a possible programmer 34. The programmer 34 can be used to program the controller 25 and, through the existing connection between the latter and the individual power supply and control circuits 15 , the latter can also be programmed and therefore the functions of the individual ceiling lights 7, 7A-7D.

In some embodiments, one or more sensors of various kinds can be connected to the power supply and control circuit 15 of one or more ceiling lights mounted in a given environment. Only three sensors 35A, 35B, 35C are indicated in the diagram of Fig. L.

In the simpler embodiments the sensors could be completely omitted, or a single sensor could be provided, for example a presence sensor. The presence sensor can be used to switch the ceiling light on / off automatically according to the presence or absence of people in the room where the light is installed.

According to other embodiments, alternatively or in combination with the presence sensor, a twilight sensor or preferably a photometric or light sensor can be provided, to detect the intensity and possibly one or more parameters, such as for example the color temperature, of the existing light in the environment. In the simplest embodiments, this sensor can be a twilight sensor, which causes or allows the lighting and / or adjustment of the lighting bodies 13 of the ceiling lamp 7 only when the light detected in the environment is lower, for example, than a predetermined threshold.

The photometric sensor or light sensor can send a direct on / off command and then directly control the switching on and off of the lighting bodies based on the amount of light detected in the environment.

In other embodiments, the photometric sensor can be used to give a consent to the switching on of the lighting bodies present in the ceiling light 7, which switching on takes place through the presence sensor, in a manner subordinate to the presence of people in the environment. In this way, the lighting bodies 13 turn on only when two conditions occur: insufficient natural lighting, and the presence of people in the room.

In other embodiments, the ceiling light 7 can be turned on / off by means of a switch, schematically indicated with 37, in the absence of presence sensors. In this case too, switching on can be subordinated to the level of light detected by the photometric sensor.

The light sensor or photometric sensor can be used to control a simple switching on and off operation, or also to control a dimming function, with which the emission level (i.e. the intensity of the light radiation generated) of the lighting bodies is modulated. according to the lighting level of the environment in which they are installed.

When a more complex photometric sensor is used, the latter can give the lighting system additional properties and functions, for example that of maintaining a certain color temperature in the environment by compensating for variations in the natural one at various times of the day, and / or allow the user to set and / or change the color temperature according to their preferences.

According to an embodiment, to regulate the color temperature it is possible to use a mixture of phosphors with emission at different color temperatures and selectively excited by different wavelengths. In this case, the phosphors can be excited by groups of separately regulated LEDs, which each emit the radiation in the necessary excitation wavelength.

In some embodiments, the user can program the power supply and control unit 15, or pilot it by means of a remote control or by means of the controller 25, so as to modify the color temperature in an automatic, programmed or manual manner at any time of the day. .

The ceiling light 7 can be equipped with other sensors, for example an infrared sensor which is part of an alarm system, or a smoke sensor, as an integral part of a fire detection system, or a temperature sensor both for the purpose of detect any fires, both in order to control the temperature of the ceiling light and intervene, by switching off the lighting bodies, in the event of overtemperature.

Other sensors can also be associated with the power supply and control circuit 15 to make the lighting system perform other functions than those mentioned above, in combination with them or as an alternative to them.

In Fig. 2 a modified scheme of a lighting system is shown. Like numbers indicate parts that are the same or equivalent to those described with reference to Fig.1. 7 again indicates a generic ceiling light in which LED lighting bodies 13 are housed. The reference number 15 indicates the power supply and control circuit connected to the lighting bodies 13 through a data line 17 and through a power supply line 19 for supplying electric current to the LEDs. 15A indicates a transmitter, for example Bluetooth for communicating with a remote control 16. 37 indicates an on and off switch placed on a line 23 which connects the ceiling light 7 and therefore the power supply and control circuit 15 to the electrical distribution network 9.

35A, 35B and 35C indicate by way of example some sensors which can be associated with the power supply and control circuit 15.

In some advantageous embodiments, the lighting system can comprise a plurality of ceiling lights, each equipped with one or more lighting bodies and each equipped with a power supply and control circuit. The power supply and control circuit 15 of a ceiling light can be programmed to operate as a master, while the other power supply and control circuits 15 can be programmed to function as a slave. In some embodiments, the power supply and control circuit can be the only one equipped with sensors and can send, via PLM, piloting or command signals to the other groups of lighting bodies 13, based on data detected by the sensor or sensors. For example, a single ceiling light can be equipped with a presence sensor and a photometric or light sensor, and control the remaining groups of lighting bodies mounted in the other ceiling lights by means of conveyed wave signals. For example, the master unit can send a dimming command to the remaining slave units, so that the lighting bodies of the various ceiling lights are controlled by a light signal generated by a single sensor.

In some embodiments, for example if the programming of the power supply and control circuit is carried out through a direct connection to a programmer (Fig. 2), it can be envisaged that communication with the programmer takes place only by the master circuit, the which can then eventually send information, commands, instructions or the like to the remaining control and power circuits, acting as slaves.

In some embodiments the master unit can be programmed to control the timed switching on of the lighting bodies interfaced to the master unit and the lighting bodies interfaced to the slave units.

For example, the master unit can also be programmed to send an ignition signal to all slave units, based on a signal generated by a presence sensor.

In other embodiments, the power supply and control circuits can constitute independent control units, i.e. without hierarchical ordering, each programmed to control only the lighting bodies associated with the unit itself, for example the lighting bodies of a single ceiling light.

The possibility is not excluded that each power supply and control circuit 15 is programmed in a different or partially different way with respect to the others. For example, it can be provided that each power supply and control circuit is controlled by its own presence sensor, so that at any time only the lighting bodies associated with the control units or control circuits 15 which actually detect the presence of people are switched on. , while other functions can be centrally controlled eg via a master unit.

In general, the system can have a flexible configuration, allowing both to increase the number of ceiling lights and / or lighting bodies, and to modify the way in which each power supply and control circuit 15 is programmed and consequently the way in which the various groups of lighting bodies are controlled, controlled or piloted.

In a possible configuration, in an environment in which one or more ceiling lights or groups of lighting bodies 13 are present, one of these can be programmed by the master and the others by the slave. The system can operate as follows, for example. When the environment is empty, the lighting bodies are off. When a user enters the room, the presence sensor associated with the power supply and control circuit which is programmed as the master, generates a signal that commands the switching on of all the lighting fixtures. The photometric sensor, light sensor or brightness sensor, which can advantageously be associated with the same power supply and control unit or circuit programmed as the master, detects the amount of ambient light and generates a dimming signal which is used to drive all the lighting bodies, both associated with the master unit and the slave units.

Commands between master and slave units are transmitted via power lines.

Figures 4 to 9 show details of a possible embodiment of a ceiling light and of the respective lighting bodies comprising the LEDs.

Fig.4 generically shows a ceiling light 7 which can comprise a pressed sheet 7X equipped with 7Y slots. Fig.4A shows a local section, along the line A-A in Fig.4, of one of the slots 7Y with which the sheet metal forming the ceiling light 7 is equipped. The slots 7Y have an elongated rectangular shape. In the example shown, the 7Y slots are arranged according to the diagonals of the 7X sheet which, in the example shown, is square in shape. Spatial arrangements other than that illustrated are also possible, depending on the shape and size of the lighting bodies to be housed in the slots and / or the ceiling light. A lighting body 13 can be housed inside each cutout 7Y.

In the illustrated embodiment, the openings 7Y of the ceiling light are arranged inclined to each other. By way of example only, in this case the slots 7Y are arranged in an X shape according to the diagonals of the ceiling light. Arrangements other than that illustrated are also possible, also depending on the number of lighting bodies to be mounted, their size and the shape and / or size of the ceiling light. In general, it is advantageous that, contrary to what is foreseen in the usual fluorescent tube ceiling lights, the elongated lighting bodies 13 are arranged non-parallel to each other. This reduces the formation of multiple shadows, which can be particularly distracting to the eye.

The control and power supply circuit 15 of the individual lighting bodies mounted on the ceiling light can be mounted on the ceiling light 7. In some embodiments, the sensor (s) (35A-35C) associated with the control and power supply circuit 15 are also mounted on the ceiling light 7. For example, these components can be integrated into a single block mounted on the upper face of the sheet 7X forming the ceiling light , that is, the face which, when mounted, faces the ceiling. 7X sheet metal can have one or more sensor holes. In other embodiments the sensors 35A-35C can be mounted separately with respect to the control and power supply circuit 15 and suitable wiring can be provided. In some embodiments, both the wiring, the sensors and also the control and power supply circuit can be preferably mounted on the upper face of the ceiling light 7, so as to remain hidden. In this case, special holes can be provided for the sensors, so that they can "read" the quantities for which they are intended to detect. The possibility of arranging the sensors in a different position with respect to the ceiling light is not excluded, then bringing the signals to the control and power supply circuit 15 by means of suitable wiring, for example in a false ceiling and / or in a ducting. The control and power supply circuit can also, less advantageously, be positioned at a distance from the ceiling light.

In general, each ceiling light can be provided with both a control and power supply circuit and also with respective sensors. The ceiling lights may differ from each other, for example in the type and number of sensors. For example, also depending on the point in which the ceiling lights are installed, it can be foreseen that only one of them or only some of them have a light sensor or a photometric sensor, and others have a presence or movement sensor and / or that some ceiling lights include both types of sensors.

In some embodiments it can be envisaged that only one ceiling light in a given environment is equipped with sensors, while the others are managed on the basis of information detected by the sensors of the single ceiling light which is provided with them. In this case, master-slave architectures can be created, where a ceiling light forms a master unit with its own lighting bodies, sensors and control and power supply circuit. The other ceiling lights form slave units. The control and power supply circuit of the latter receives commands from the master unit. In some cases it can be envisaged that several ceiling lights work as master units in relation to different functions. For example, a first ceiling light can be used to detect, through its own sensors, ambient lighting, while a second ceiling light can be used to detect the presence of users. The signals of these two ceiling lights are used to manage also other ceiling lights operating as slave units.

In some embodiments, all the ceiling lights can be equipped with temperature sensors, for safety reasons.

Figures 5 and 6 show a partial side view and cross section of a generic lighting body 13 mounted on the sheet 7X forming a ceiling lamp 7. In this embodiment, the lighting body 13 comprises an elongated housing 41 having a bottom wall 43 and two side walls 45. In front of the bottom wall 43 there is an opening 47 closed by a screen or laminar window 49 consisting for example of a transparent synthetic resin on which one or more luminescent substances (so-called phosphors) are deposited or incorporated . These substances receive the electromagnetic radiation generated by the LEDs at a certain wavelength or wavelength range and transform it into white light.

As known to those skilled in the art, LEDs can emit for example in the ultraviolet or blue range. Depending on the emission wavelength of the LEDs, different luminescent substances can be used to obtain the desired light spectrum exiting the luminaire 13. Commonly used luminescent materials or phosphors are for example YAG: Ce (Y3Al50i2: Ce <3 +>, which converts blue light into yellow light. The combination of LEDs emitting in blue with YAG: Ce gives rise to an emission substantially in white light. The spectrum emitted depends on the thickness of the screen containing the phosphor and / or on the concentration of phosphor, i.e. luminescent material, used. Other commonly used phosphor mixtures may include (Ba, Sr) 2SisN8: Eu <2+>, which converts blue light to amber light, in combination with YAG: Ce and blue LEDs, or Lu3Al50i2: Ce <3+> and CaS: Eu <2+> with blue emitting LEDs. Other phosphors convert blue light into red light, such as (Ba, Sr, Ca) 2SisN8: Eu <2+> , (Sr, Ca) S: Eu <2+> and (Ca, Sr) AlSiN3: Eu <2+>. Some phosphors convert blue light to green light, q such as Sr2Si2N2O2: Eu <2+> and SrGa2S4: Eu <2+>. When the LED emits in the ultraviolet, the phosphors can include for example a mixture of BaMgAlioOi7: Eu <2+>, Ca8Mg (SiO4) 4Cl2: Eu <2+>, Mn <2+> and Y2O3: Eu <3+> , Bi <3+>.

The shape of the housing 41 can be better understood by observing Fig. 7, which shows a cross section of the housing alone, without the remaining components forming the lighting body 13.

In substance, the main body of the housing 41 is formed by a profile, for example of aluminum, with an overall C or U shape, of which the side walls 45 form the sides. The bottom wall 43 and the side parts 45 form a channel. A flange 51A, 51B develops along the edges of the channel thus formed. The flange 51A, 51B is shaped so as to cooperate with the longitudinal edges of the respective cutout 7X in which the lighting body 13 is inserted. The locking of the single lighting body 13 on the ceiling lamp 7 can be obtained as shown for example in Fig. 5 . One or more shaped elastic clips 14 are fitted along the housing 41 and beyond it. The shape of the elastic clips can be such that they engage undercut to the fins 59 remaining fixed to the housing 41. The ends of each clip 14, which is approximately "omega" shaped, rest or press against the lips 7Z formed parallel to the slots 7Y, preventing the lighting bodies 13, inserted in the 7Y slots from below, from falling.

In some advantageous embodiments, along the internal surface of the bottom wall 43 a groove 53 is provided in an approximately central position, extending according to a longitudinal development of the profile forming the housing 41. The groove 53 forms a housing for the electronic card, indicated with 55, on which LED 57 are applied (Fig. 5). The LEDs 57 can be arranged in line with each other to form a linear matrix. In other embodiments, the matrix can be two-dimensional, for example comprising two side-by-side rows of LEDs. The elongated shape of the lighting body 13, which requires a corresponding aligned arrangement of LEDs, is preferable when the lighting body 13 is replaced by a normal fluorescent lamp (neon tube).

The electronic board 55, for example made of a suitable heat conducting material, housed in the groove 53, is in thermal contact with a large surface of the bottom wall 43 of the housing 41 of the lighting body 13. A heat exchange is thus obtained by conduction between the electronic board 55, which heats up due to the thermal dissipation of the LEDs 57, and the back wall 43.

The heat generated by the electronic circuitry mounted on the electronic board 55 can be dissipated by natural convection from the surface of the profile forming the housing 41. To improve the heat dissipation, in some embodiments a cooling fin is provided. In the embodiment illustrated in the drawing, the housing 41 is equipped with a double fin 59 made on both sides of the housing 41 and preferably along the side walls 45, near the bottom wall 43.

In other embodiments, the finning can be made on the surface facing outwards of the bottom wall 43 of the section forming the housing 41.

As shown in particular in the section of Fig.7, on the internal surfaces of the two side walls 45 there are two channels 61 which develop parallel to the longitudinal development of the section forming the housing 41. The channels 61 serve as mounting and retaining seats of the photoluminescent screen 49.

In some embodiments the internal surfaces of the walls 43, 45 can be treated, for example painted, to form a chamber for mixing the electromagnetic radiation generated by the LEDs 57. In other embodiments, as illustrated for example in Fig.5, a mixing chamber 65 is formed by means of a folded sheet or lamina material 67, for example of plastic material. In the illustrated embodiment, the sheet material 67 has four portions 67A, 67B, 67C, 67D. The portions 67B, 67C converge towards an area in which the linear matrix of LEDs 57 is arranged, which protrude through the laminar material 67 in correspondence with suitable holes made in the convergence area of the portions 67B, 67C. In advantageous embodiments the portions 67A, 67D are adjacent to the side walls 45 of the housing 41, while the portions 67B, 67C form inclined walls or inclined sides of the folded sheet material 67, behind which the bottom wall is located 43 of the 4L housing

In other embodiments, the mixing chamber can be made of a monobloc material, for example ceramic, instead of a sheet material.

In the mixing chamber 65 both the electromagnetic radiation emitted by the LEDs 57 and the electromagnetic radiation reflected or diffused towards the interior by the photoluminescent screen 49 are reflected and / or diffused from the internal surface of the sheet material 67. About 50% of the radiation incident on the photoluminescent screen 49 passes through the latter and is transformed into luminous radiation of the wavelength or with the desired frequency spectrum, which illuminates the environment in which the ceiling light on which the lighting bodies 13 are mounted is arranged.

In advantageous embodiments, the ends of the section forming the housing 41 are closed by respective lids or caps 71A, 71B (see Figs.8 and 9).

Each cover 71 A, 71B has an upper tab 73 for retaining the photoluminescent screen 49 and a protrusion 75 or pad which fits inside the compartment defined between the bottom wall 43 and the side walls 45 of the profile forming the housing 41 In some embodiments, the cover 71A also has a recess 75 through which the electronic board 55, housed inside the housing 41, protrudes, and on the end of which an integrated driving circuit for the LEDs or more can be mounted. simply a connector, schematically indicated with 56, for connection to the control and power supply circuit 15 and / or to other lighting bodies 13 of the same group, ie for example mounted on a common ceiling lamp 7. The component 56 is thus found on the outside of the housing 41 (see Fig. 6).

The embodiments described above and illustrated in the drawings have been discussed in detail as examples of implementation of the invention. Those skilled in the art will understand that many modifications, variations, additions and omissions are possible, without departing from the principles, concepts and teachings of the present invention as defined in the appended claims. Therefore, the scope of the invention must be determined solely on the basis of the broadest interpretation of the attached claims, including such modifications, variations, additions and omissions. The terms “understand” and its derivatives do not exclude the presence of further elements or phases in addition to those specifically indicated in a specific claim. The term "a" or "a" preceding an element, means or feature of a claim does not exclude the presence of a plurality of such elements, means or features. When a device claim lists a plurality of "means", some or all of such "means" may be implemented by a single component, member or structure. The enunciation of certain elements, characteristics or means in separate dependent claims does not exclude the possibility of combining said elements, characteristics or means with each other. When a method claim lists a sequence of steps, the sequence in which those steps are listed is not binding, and may be changed, if the particular sequence is not indicated as binding. The presence of any reference numbers in the attached claims has the purpose of facilitating the reading of the claims with reference to the description and the drawing, and does not limit the scope of protection represented by the claims.

Claims (34)

"Lighting system and its components" Claims 1. A LED lighting body comprising an elongated housing with a back wall and an opposing opening extending along the longitudinal development of the housing; in which an electronic board is arranged inside the housing, equipped with a plurality of LEDs distributed along the longitudinal development of the housing and facing the housing opening; and in which a screen is housed in said opening which closes said opening and comprises a photoluminescent material, which modifies the spectrum of the radiation of the LEDs. 2. Lighting body according to claim 1, in which said housing is made of a metal section. 3. Lighting body as per claim 1 or 2, in which said housing has at least one external heat dissipation fin and in which said electronic card is in thermal contact with the housing to dissipate heat through the wall of said housing and said at least one external fins. 4. Lighting body according to claim 3, wherein said housing comprises a plurality of heat dissipation fins on two longitudinal walls of the housing. 5. Lighting body as per claim 4, in which said dissipation fins extend for the entire longitudinal development of the housing. 6. Lighting body according to one or more of the preceding claims, in which a mixing chamber is arranged inside said housing, the LEDs being arranged to radiate into said mixing chamber and said mixing chamber being closed by said laminar screen, the which receives electromagnetic radiation diffused in said mixing chamber and converts it into visible light. 7. Lighting body as per claim 6, wherein said mixing chamber comprises diffusing walls inserted in said housing. 8. Lighting body according to claim 7, in which said diffusing walls are formed by a sheet material folded and inserted in said housing, or by a ceramic material. 9. Lighting body as per claim 7 or 8, wherein along at least one of said diffusing walls of the mixing chamber there is a plurality of holes in correspondence with which the LEDs are inserted, the electronic board being placed outside the mixing chamber mixing. 10. Lighting body according to one or more of claims 6 to 8, in which the mixing chamber extends throughout the longitudinal development of the housing. 11. Lighting body in which said LEDs are arranged according to a linear matrix. 12. Lighting body according to one or more of the preceding claims, in which said housing has a substantially U-shaped cross section. 13. Lighting body according to one or more of the preceding claims, in which the back wall of the housing has a slot for receiving the electronic card. 14. Lighting body according to one or more of the preceding claims, wherein said housing comprises a longitudinal flange, extending on both longitudinal sides of said opening. 15. Lighting body according to one or more of the preceding claims, in which said housing has, along the opening and on the internal walls of the housing, retaining channels of the laminar screen. 16. Lighting body according to one or more of the preceding claims, in which said electronic card has a greater length than the housing and carries a connector arranged on a portion of the electronic card protruding from the housing. 17. Lighting body according to one or more of the preceding claims, comprising a pair of end caps, fixed to the longitudinal ends of the housing. 18. Lighting body as per claim 17, in which each of said end caps comprises a protuberance which fits into the housing and a cover flap of a terminal edge of the laminar screen, and in which preferably one of said end caps it has a lowered area for the passage of the electronic card towards the outside of the housing. 19. A ceiling light comprising a support with a plurality of seats for respective lighting bodies as per one or more of the preceding claims. 20. Ceiling lamp as per claim 19, comprising a cut sheet metal, equipped with slots for interlocking said lighting bodies, said slots forming the seats for the lighting bodies. 21. Ceiling light as per claim 19 or 20, in which the seats for the lighting bodies are oriented in such a way that said lighting bodies are arranged at least partially with orientations not parallel to each other. 22. Ceiling lamp according to one or more of claims 19 to 21, comprising a power supply and control circuit for the lighting bodies. 23. Ceiling light according to claim 22, comprising a data transceiver device for communicating with other ceiling lights. 24. Ceiling lamp as claimed in claim 23, wherein said transceiver device comprises a conveyed wave modem (PLM) which can be interfaced to an electrical power supply line. 25. Ceiling light according to claim 22, 23 or 24, comprising at least one sensor selected from the group consisting of: presence sensors, motion sensors, infrared sensors, ambient light sensors, temperature sensors, smoke sensors, fire sensors, or their combinations. 26. Ceiling light according to one or more of claims 19 to 25, comprising a programmable central unit. 27. A lighting system comprising a plurality of ceiling lights as per one or more of claims 19 to 26, in which said ceiling lights are connected via the electrical distribution network to mutually exchange data between them. 28. System as per claim 27, in which a control unit of one of said ceiling lights is programmed to function as a master and the control units of a plurality of said ceiling lights are programmed to function as a slave. 29. A lighting system comprising: · A plurality of groups of lighting bodies, each of said groups of lighting bodies comprising one or more lighting bodies and each lighting body comprising one or more remote phosphor LEDs; • for each group of lighting bodies, a power supply and control circuit and a transceiver device to communicate with the power supply and control circuits of other groups of lighting bodies; wherein at least one of said power supply and control circuits is associated with at least one sensor which generates at least one signal used by the power supply and control circuit for driving the lighting bodies. 30. Lighting system according to claim 29, wherein said transceiver device comprises a conveyed wave modem (PLM) which can be interfaced to an electrical distribution network. 31. Lighting system according to claim 29 or 30, in which one of said power supply and control circuits is programmed as master and the remaining power and control circuits are programmed as slave. 32. Lighting system as per claim 29 or 30 or 31, in which said power supply and control circuits control the switching on and off and / or the intensity of emission of the respective lighting bodies. 33. Lighting system according to one or more of claims 29 to 32, wherein said at least one sensor is selected from the group comprising: a light sensor, a photometric sensor, a twilight sensor, a presence sensor, a movement sensor , a temperature sensor, an infrared sensor, a temperature sensor, or combinations thereof. 34. Lighting system according to one or more of claims 29 to 33, in which at least one of the power supply and control circuits can be interfaced with a programming unit.