NL2016139B1 - A LED luminaire for illuminating plants from above in a greenhouse, and a lighting device. - Google Patents

A LED luminaire for illuminating plants from above in a greenhouse, and a lighting device. Download PDF

Info

Publication number
NL2016139B1
NL2016139B1 NL2016139A NL2016139A NL2016139B1 NL 2016139 B1 NL2016139 B1 NL 2016139B1 NL 2016139 A NL2016139 A NL 2016139A NL 2016139 A NL2016139 A NL 2016139A NL 2016139 B1 NL2016139 B1 NL 2016139B1
Authority
NL
Netherlands
Prior art keywords
base plate
side wall
side walls
outer side
top plate
Prior art date
Application number
NL2016139A
Other languages
Dutch (nl)
Other versions
NL2016139A (en
Inventor
Johannus Petrus Brok Matheus
Original Assignee
Hortilux Schréder B V
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
Application filed by Hortilux Schréder B V filed Critical Hortilux Schréder B V
Priority to NL2016139A priority Critical patent/NL2016139B1/en
Publication of NL2016139A publication Critical patent/NL2016139A/en
Application granted granted Critical
Publication of NL2016139B1 publication Critical patent/NL2016139B1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S4/00—Lighting devices or systems using a string or strip of light sources
    • F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • F21S4/28—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V15/00—Protecting lighting devices from damage
    • F21V15/01—Housings, e.g. material or assembling of housing parts
    • F21V15/013—Housings, e.g. material or assembling of housing parts the housing being an extrusion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING 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
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

The invention relates to a LED, comprising: - a base plate comprising two long and short sides; - two inner side walls extending upwards from a respective long side; - an outer side wall associated with each inner side wall and extending at a distance from but parallel to the inner side wall; - bridging members connecting the outer side wall with the respective inner side wall; - a top plate connecting the two inner side walls above the base plate at a distance thereof, wherein each outer side wall is connected to the respective inner side wall via a plurality of bridging members while providing openings in between the bridging members, wherein a length of the openings is equal to a length of the bridging members, and wherein the housing comprises thermally conducting material to transfer heat from the base plate to the inner and outer side walls.

Description

Title: A LED luminaire for illuminating plants from above in a greenhouse, and a lighting device
The invention relates to a LED luminaire for illuminating plants from above in a greenhouse and a lighting device comprising such a luminaire.
It is well-known to use artificial light in greenhouses to aid the growth of the plants. For this reason, luminaires are provided above the plants to illuminate the plants from above thereby mimicking daylight. However, during sunny days, the luminaire is not used as the sun provides sufficient light for the plants. In that case, the luminaires have the disadvantage of blocking sunlight.
Decreasing the size of the luminaire to reduce the blocking of sunlight introduces thermal issues as a smaller luminaire with a similar heat production reaches a higher temperature as it is more difficult to get rid of the heat. Providing cooling to the luminaires has the disadvantage of more energy consumption and increasing the size and complexity of the luminaire.
Hence, it is an object of the invention to provide an improved luminaire for illuminating plants from above in a greenhouse that is able to provide sufficient light while keeping the dimensions as small as possible.
This object is achieved by a LED luminaire for illuminating plants from above in a greenhouse as described in claim 1.
Advantages of the LED luminaire according to the invention may include: 1) The use of LEDs which provides a more energy efficient solution compared to other light sources and thus to less heat production; 2) A rectangular profile of the luminaire when seen from below or above provides the advantage that it is easier to let the luminaire overlap with other constructional elements in the greenhouse, such as beams so that the additional sunlight blocking is limited to the non-overlapping portion; and 3) The provision of the inner and outer side walls connected to each other via the bridging members in combination with the thermally conductive material allows to efficiently transfer heat to the environment using convection in between the inner and outer side walls.
In an embodiment, the inner and outer side walls extend beyond the top plate. This has the advantage that they have a larger surface area to transfer heat to the surroundings.
In an embodiment, the top plate comprises a fin, preferably multiple fins extending upwards from the top plate. As a result thereof, heat can be more efficiently transferred to the surroundings without occupying significantly more space, especially when combined with the feature that the inner and outer side walls extend beyond the top plate.
In an embodiment, the one or more fins extending from the top plate extend parallel to the inner and outer side walls that extend beyond the top plate, preferably such that the length of the fins extending from the top plate is substantially equal to the length of the parts of the inner and outer side walls extending beyond the top plate.
In an embodiment, the housing has a substantially constant cross section over its length. This allows to manufacture the housing using an extrusion technique.
In an embodiment, the luminaire further comprises end caps to close off a space delimited by the base plate, two inner side walls and the top plate. This allows to protect the components arranged inside the space.
The invention also relates to a lighting device comprising a luminaire according to the invention, a plurality of LEDs mounted to the base plate of the luminaire such that heat generated by the LEDs can be transferred to the base plate, and a driver for driving the LEDs, which driver is housed in a space delimited by the base plate, two inner side walls and the top plate.
The invention will now be described in a non-limiting way by reference to the accompanying drawings, in which like parts are indicated by like reference symbols, and in which:
Fig. 1 depicts a cross section of a housing of a luminaire according to an embodiment of the invention;
Fig. 2 depicts a perspective view of a lighting device comprising the luminaire of Fig. 1; and
Fig. 3 depicts an exploded view of the lighting device of Fig. 2.
Fig. 1 depicts a cross section of an elongated housing 10 as part of a LED luminaire for illuminating plants from above in a greenhouse.
The housing 10 forms the basis of a lighting device LD as shown in Fig. 2 in assembled state, and as shown in Fig. 3 in exploded view. Reference is made to Figs. 1-3 in the following section.
The housing 10 comprises a rectangular base plate 12, which in use faces towards the plants in the greenhouse. The rectangular base plate 12 may comprise connectors 12a, 12b to mount a plurality of LEDs thereto, for instance by mounting a LED carrying PCB to the connectors 12a, 12b. The base plate 12 further comprises two parallel opposite long sides 12c and two parallel opposite short sides 12d.
The housing 10 further comprises two inner side walls 14 extending upwards from a respective long side 12c of the base plate 12, and an outer side wall 16 associated with the respective inner side wall 14 and extending at a distance from but substantially parallel to the respective inner side wall 14.
Bridging members 18 are provided to connect the outer side wall 16 with the respective inner side wall 14 at the base plate side of the inner and outer side walls. Although only a few bridging members 18 in Fig. 3 are indicated by reference numeral 18, it can be clearly seen that each outer side wall 16 is connected to the respective inner side wall via a plurality of bridging members 18 distributed along a length of the luminaire and providing openings 19 in between the bridging members 18, wherein a length of the openings 19 seen in longitudinal direction of the luminaire is substantially equal to a length of the bridging members seen in the same direction.
The inner side walls 14 are connected to each other above the base plate 12 at a distance thereof by a top plate 20, so that a space 21 is formed delimited by the base plate 12, the inner side walls 14 and the top plate 20.
The inner and outer side walls 14, 16 extend beyond the top plate 20 and extending parallel thereto from the top plate 20 are six fins 22, 24, wherein the three fins 22 are arranged next to one of the two inner side walls 14 and the other three fins 24 are arranged next to the other one of the two inner side walls 14.
The extensions of the inner and outer side walls beyond the top plate 20 and the additional fins allow to efficiently transfer heat from the housing 10 to the surroundings.
The housing 10 comprises thermally conducting material to transfer heat from the base plate 12 to the inner and outer side walls 14, 16. Hence, heat generated by LEDs mounted to the base plate 12 can be transferred to the inner and outer side walls 14, 16 via the base plate 12, and via the inner side walls 14 also to the top plate 20 and fins 22, 24. As a result of the heated inner and outer side walls, the air trapped in between the inner and outer side walls will increase in temperature. Due to the openings 19 in between the bridging members, this air is able to start rising as a result of convective forces and be replaced by cooler air from the surroundings. It has been found by the inventors that this passive cooling mechanism can be sufficient even when the entire surface of the base plate is covered with LEDs.
The advantage of this passive cooling mechanism is that it does not require much space and thus the luminaire can be slender and block minimal sunlight from entering the greenhouse.
The lighting device LD further comprises PCBs 30 with a plurality of LEDs to be mounted to the base plate 12. To protect the LEDs from dirt, dust, insects, etc. and to allow easy cleaning, the PCB may be covered with a glass plate 32. Any space in between PCB 30 and glass plate 32 on the one hand and the housing 10 on the other hand may be filled with potting 34.
Arranged inside space 21 of the housing 10 are in this embodiment a driver plate 36 and two drivers 38 that are electrically connected to the LEDs on the PCB 30 via the driver plate 36. To protect the driver plate 36 and drivers 38 inside the space, the luminaire may comprise end caps 40 to close off the space 21. End caps 40 may be configured to allow electrical connections to the drivers 38, e.g. to power the drivers 38.
To mount the luminaire at an elevated height in the greenhouse, connection elements 42 are provided, which in this embodiment provide a connection between a pair of fins 22,24 and a constructional element of the greenhouse. The connection elements 42 may for instance be bolted or screwed to the constructional elements and the luminaire may be connected to the connection elements using snap connectors allowing for easy disconnection of the luminaire, e.g. for maintenance or replacement purposes.

Claims (6)

1. Een LED-armatuur voor het van bovenaf verlichten van planten een kas, waarbij de genoemde armatuur een langwerpige behuizing omvat met: • een rechthoekige basisplaat, die in gebruik naar beneden is gericht richting de planten, en ingericht om meerdere LEDs daaraan te monteren, waarbij de basisplaat twee parallel tegenover elkaar liggende lange zijden en twee parallel tegenover elkaar liggende korte zijden omvat; • twee binnenzijwanden, waarbij elke binnenzijwand zich naar boven toe uitstrekt vanaf een respectieve lange zijde van de basisplaat; • een buitenzijwand horende bij elke binnenzijwand en die zich op een afstand van maar in hoofdzaak parallel aan de respectieve binnenzijwand uitstrekt; • overbruggende organen die de buitenzijwand met de respectieve binnenzijwand verbinden aan de basisplaatkant van de binnen- en buitenzijwanden; en • een bovenplaat die de twee binnenzijwanden verbindt boven de basisplaat op een afstand daarvan; waarbij elke buitenzijwand is verbonden met de respectieve binnenzijwand via een meervoud van overbruggende organen verdeeld langs een lengte van de armatuur en openingen verschaffend tussen de overbruggende organen, waarbij een lengte van de openingen tussen de overbruggende organen gezien in lengterichting van de armatuur in hoofdzaak gelijk is aan een lengte van de overbruggende organen gezien in lengterichting van de armatuur, en waarbij de behuizing warmtegeleidend materiaal omvat om de warmte te geleiden van de basisplaat naar de binnen- en buitenzijwanden.An LED fixture for illuminating plants from above a greenhouse, wherein said fixture comprises an elongated housing with: a rectangular base plate which, in use, is directed downwards towards the plants, and adapted to mount a plurality of LEDs thereto wherein the base plate comprises two parallel sides of long sides and two parallel sides of short sides; Two inner side walls, each inner side wall extending upwards from a respective long side of the base plate; An outer side wall associated with each inner side wall and extending at a distance of but substantially parallel to the respective inner side wall; Bridging members connecting the outer side wall with the respective inner side wall on the base plate side of the inner and outer side walls; and a top plate connecting the two inner side walls above the base plate at a distance therefrom; wherein each outer side wall is connected to the respective inner side wall via a plurality of bridging members distributed along a length of the armature and providing openings between the bridging members, wherein a length of the openings between the bridging members is substantially the same in the longitudinal direction of the armature at a length of the bridging members viewed in the longitudinal direction of the fixture, and wherein the housing comprises heat-conducting material to conduct the heat from the base plate to the inner and outer side walls. 2. De armatuur volgens conclusie 1, waarbij de binnen- en buitenzijwanden zich uitstrekken tot voorbij de bovenplaat.The fixture according to claim 1, wherein the inner and outer side walls extend beyond the top plate. 3. De armatuur volgens conclusie 1, waarbij de bovenplaat een vin omvat die zich naar boven toe uitstrekt vanaf de bovenplaat.The fixture according to claim 1, wherein the top plate comprises a fin extending upwards from the top plate. 4. De armatuur volgens conclusie 1, waarbij de behuizing een in hoofdzaak constante dwarsdoorsnede over zijn lengte heeft.The fixture according to claim 1, wherein the housing has a substantially constant cross-section along its length. 5. De armatuur volgens conclusie 1,verder omvattende eindkappen om een ruimte afgebakend door de basisplaat, twee binnenzijwanden en de bovenplaat af te sluiten.The fixture according to claim 1, further comprising end caps to close off a space defined by the base plate, two inner side walls and the top plate. 6. Een verlichtingsinrichting omvattende: • een armatuur volgens een van de conclusies 1-5; • een meervoud van LEDs gemonteerd aan de basisplaat van de armatuur zodat de warmte gegenereerd door de LEDs kan worden geleid naar de basisplaat; en • een driver voor het aansturen van de LEDs, waarbij de driver is ondergebracht in een ruimte afgebakend door de basisplaat, twee binnenzijwanden en de bovenplaat.A lighting device comprising: • a fixture according to any of claims 1-5; A plurality of LEDs mounted on the base plate of the fixture so that the heat generated by the LEDs can be conducted to the base plate; and • a driver for controlling the LEDs, wherein the driver is housed in a space defined by the base plate, two inner side walls and the top plate.
NL2016139A 2016-01-22 2016-01-22 A LED luminaire for illuminating plants from above in a greenhouse, and a lighting device. NL2016139B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL2016139A NL2016139B1 (en) 2016-01-22 2016-01-22 A LED luminaire for illuminating plants from above in a greenhouse, and a lighting device.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2016139A NL2016139B1 (en) 2016-01-22 2016-01-22 A LED luminaire for illuminating plants from above in a greenhouse, and a lighting device.

Publications (2)

Publication Number Publication Date
NL2016139A NL2016139A (en) 2017-07-27
NL2016139B1 true NL2016139B1 (en) 2017-08-09

Family

ID=56084308

Family Applications (1)

Application Number Title Priority Date Filing Date
NL2016139A NL2016139B1 (en) 2016-01-22 2016-01-22 A LED luminaire for illuminating plants from above in a greenhouse, and a lighting device.

Country Status (1)

Country Link
NL (1) NL2016139B1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4729078A (en) * 1987-04-27 1988-03-01 Maer Skegin Extruded lamp housings
BRPI0910962B1 (en) * 2008-04-04 2019-05-28 Cree, Inc LED LIGHTING APPLIANCE
CA2724794C (en) * 2008-05-22 2015-09-08 Syddansk Universitet Method and apparatus for using light emitting diodes in a greenhouse setting
WO2009046548A2 (en) * 2008-12-15 2009-04-16 Michael Herbert Williamson Method and assembly using emitting dioded (leds) for plant-growing
WO2014113838A1 (en) * 2013-01-22 2014-07-31 Vertical Farm Systems Pty Ltd An improved lighting assembly for intensive plant cultivation
WO2015066240A1 (en) * 2013-10-29 2015-05-07 Acrooptics, Llc Led lighting system for promoting biological growth

Also Published As

Publication number Publication date
NL2016139A (en) 2017-07-27

Similar Documents

Publication Publication Date Title
US20200149723A1 (en) High Intensity Light-Emitting Diode Luminaire Assembly
US20150116997A1 (en) LED Lighting System for Promoting Biological Growth
US9366422B2 (en) Slotted heatsinks and systems and methods related thereto
CA2628115C (en) Luminaire system with thermal chimney effect
EP2603939B1 (en) Insulated led device
US20090212707A1 (en) Led system for producing light
AU2009232343A1 (en) LED light fixture
EP3165823B1 (en) Led luminaire
US20150092410A1 (en) Luminaire
JP2018531588A (en) Lighting system for plant growth
EA200702246A1 (en) OPTICAL SIGNAL DEVICE
KR101701143B1 (en) A lamp using led
US20100006556A1 (en) Atmospheric heater
NL2016139B1 (en) A LED luminaire for illuminating plants from above in a greenhouse, and a lighting device.
RU2625459C1 (en) Led lighting device (versions)
RU131130U1 (en) LED LIGHTING FOR STREETS
RU2699013C2 (en) Led lamp and method of lighting agricultural crops
BE1030476B1 (en) Lighting element with LEDs.
US20060176691A1 (en) Liquid cooled flashlight with optional display
US20210364891A1 (en) Device for Recording a Three-Dimensional Environment
EP2107621A1 (en) Light module
RU133901U1 (en) LED LIGHTING DEVICE
RU222504U1 (en) LED lamp with cooling system
RU204579U1 (en) LED LIGHT WITH CONVECTION COOLING
US10433418B2 (en) Assembly and lighting device comprising the assembly