Lamp comprising lens cover with parylene coating

Abstract

The lens cover includes a body and a parylene coating. The body includes a bottom substrate and a plurality of optical lens elements. The bottom substrate is substantially planar and defines an outer perimeter. A plurality of optical lens elements extend from and cooperate with the bottom substrate to provide an outer surface and an inner surface of the lens cover. Each optical lens element of the plurality of optical lens elements is configured for alignment with the light emitting diode. A parylene coating is disposed on the outer surface and the inner surface. A plurality of optical lens elements protrude from the bottom substrate at an outer surface. The lens cover is formed as a unitary one-piece structure such that the outer surface extends continuously between the base substrate and each optical lens element to form a fluid impermeable barrier therebetween.

Description

Technical Field

[0001] The apparatus described below generally relates to a luminaire including an array of light sources for illuminating an indoor growing facility. Each light source includes at least one light emitting diode (LED) and a lens cover at least partially coated with a parylene coating. Background Art

[0002] Indoor growing facilities, such as greenhouses, include fixtures that provide artificial lighting to plants to promote growth. Each of these fixtures typically includes multiple LEDs that generate artificial light for the plants. However, the environment within these indoor growing facilities can include different types of gases and / or airborne fluid particles that cause the optical quality of the LEDs to degrade over time (e.g., yellow). BRIEF DESCRIPTION OF THE DRAWINGS

[0003] Various embodiments will be better understood with reference to the following description, appended claims and accompanying drawings, in which:

[0004] FIG1 is an upper isometric view depicting a lamp according to one embodiment;

[0005] FIG2 is a lower isometric view of the light fixture of FIG1 , wherein the light fixture is shown to include a pair of lighting modules;

[0006] FIG3 is a partially exploded upper isometric view of the LED lamp of FIG1 ;

[0007] 4 is a partially exploded lower isometric view of the LED lamp of FIG. 1 , wherein each lighting module is shown including a lens cover, according to one embodiment;

[0008] FIG5 is a cross-sectional view taken along line 5-5 in FIG4;

[0009] FIG6 is a schematic diagram of various components of the lamp of FIG1 ;

[0010] 7 is an upper isometric view depicting a lens cover for a lighting fixture according to another embodiment;

[0011] FIG8 is a lower isometric view of the lens cover of FIG7; and

[0012] FIG. 9 is a cross-sectional view taken along line 9 - 9 in FIG. 7 . DETAILED DESCRIPTION

[0013] Embodiments are described in detail below in conjunction with the views and examples of Figures 1-9, wherein the same numbers indicate the same or corresponding elements in all views. A lamp 20 for an indoor growing facility (e.g., a greenhouse) is generally depicted in Figures 1 and 2, and may include a housing 22, a first lighting module 24 and a second lighting module 26 (Figure 2), and a hanger assembly 28. The housing 22 may include a light support portion 30 and a controller support portion 32 adjacent to the light support portion 30. The lamp support portion 30 may define a lighting socket 34 (Figure 1) and a window 36 (Figure 2) disposed below the lighting socket 34. The first and second lighting modules 24, 26 (Figure 2) may be disposed in the lighting socket 34 above the window 36, and may be configured to emit light through the window 36, as will be described in further detail below.

[0014] The hanger assembly 28 can facilitate hanging the light fixture 20 above one or more plants (not shown) so that light emitted from the first and second lighting modules 24, 26 through the window 36 can be transmitted to the plants below to stimulate growth. The hanger assembly 28 may include a pair of hanger supports 38 and a hanger bracket 40. The hanger supports 38 can be coupled to the housing 22 on opposite sides of the light fixture 20. The hanger bracket 40 can be coupled to the hanger supports 38 and can extend between the hanger supports 38 to facilitate hanging the light fixture 20 from the ceiling of an indoor growing facility. In one embodiment, as shown in Figures 1 and 2, the hanger bracket 40 can have a substantially J-shaped cross-sectional shape to facilitate selectively hanging the light fixture 20 from a beam or other slender support member disposed along the ceiling of the indoor growing facility.

[0015] Referring now to FIGS. 3 and 4 , the housing 22 may include a main frame 42 and a cover member 44 overlying the main frame 42 and coupled to the main frame 42 via any of welding, adhesives, releasable tabs (not shown), fasteners (not shown), or various suitable alternative permanent or releasable fastening means. The main frame 42 may include a bottom lighting wall 46 defining the window 36. As shown in FIG. 3 , the main frame 42 may include a bottom controller wall 48 and a plurality of side walls 50 that cooperate to define a controller receptacle 52. The cover member 44 may include a cover portion 54 that overlies and covers the controller receptacle 52, as shown in FIG. The bottom controller wall 48, the side walls 50, and the cover portion 54 may form at least a portion of the controller support portion 32 of the housing 22.

[0016] As shown in FIG3 , the first and second lighting modules 24, 26 can each include a base 56, 58, a plurality of light emitting diodes (LEDs) (e.g., 60 in FIG5 ), and a lens cover 64, 66, respectively. With reference to FIG5 , the first lighting module 24 will now be discussed, but it can be understood to represent the second lighting module 26. The LED 60 can include a surface mount LED that is mounted to the base 56 by any of a variety of methods or techniques known in the art. The LED 60 can be any of a variety of suitable configurations mounted directly or indirectly to the base 56. The LED 60 can include a monochromatic LED (e.g., capable of emitting only one color of light, such as white, red, or blue), a multicolor LED (e.g., capable of emitting different colors, such as white, red, and blue), or a combination of both. The base 56 can be formed of any of a variety of thermally conductive materials suitable for physically and thermally supporting the LED 60.

[0017] The lens cover 64 can cover the base 56 and the LED 60, and can be coupled to the base 56 by fasteners 65 (FIG. 3) or any of a variety of suitable alternative coupling means. The lens cover 64 can include a body 67, which includes a bottom substrate 68 and a plurality of optical lens elements 70. The bottom substrate 68 can be substantially planar, and the plurality of optical lens elements 70 can extend from the bottom substrate 68. Each of the optical lens elements 70 can be substantially aligned with a corresponding LED in the LED 60, and can be configured to redistribute (e.g., concentrate or disperse) light emitted from the LED 60 toward an area below the luminaire 20 (e.g., toward one or more plants). In one embodiment, as shown in FIGS. 4 and 5, each optical lens element 70 can have a concave oval shape. However, the optical lens element 70 can be any of a variety of suitable alternative shapes or combinations thereof for achieving a desired redistribution of light emitted from the LED 60.

[0018] As shown in FIG. 5 , each LED 60 can be aligned with a corresponding optical lens element 70 such that the physical center P and the focal center F are coaxial (i.e., each LED 60 is aligned with a corresponding optical lens element 70). In another embodiment, each LED 60 can be slightly offset from the corresponding optical lens element 70 such that the physical center P and the focal center F are not coaxial (i.e., each LED 60 is not aligned with a corresponding one of the optical lens elements 70). In one embodiment, the lens cover 64 can be an integral, single-piece structure formed of a polycarbonate material and / or polymethyl methacrylate (PMMA). However, it should be understood that the lens cover 64 can be formed of any of a variety of suitable alternative translucent or transparent materials that can protect the underlying LEDs from environmental conditions and can also accommodate multiple optical lens elements 70 for redistributing light transmitted from the underlying LEDs.

[0019] The lens cover 64 can be spaced apart from the base 56 such that the lens cover 64 and the base 56 cooperate to form an interior 72 therebetween. An encapsulating material 74 can be disposed within the interior 72 such that the encapsulating material 74 substantially fills the interior 72 and encapsulates the LED 60 therein. The encapsulating material 74 can be formed of an optically neutral (or enhancing) material that reduces optical losses in the interior 72 that might otherwise occur in the absence of the encapsulating material 74 (e.g., if air is present in the interior 72). In one embodiment, the interior 72 can be filled with enough encapsulating material 74 (e.g., completely filled) so that the interior 72 is substantially free of air bubbles or other media that would adversely affect the optical integrity between the LED 60 and the lens cover 64. The encapsulating material 74 can also protect the LED 60 from environmental conditions that may bypass the lens cover 64, such as gaseous fluids (e.g., greenhouse gases). In one embodiment, the encapsulating material 74 can be a silicone gel, such as a methyl-type silicone (e.g., polydimethylsiloxane) or a phenyl-type silicone, for example, having a refractive index between about 1.35 and 1.6. It should be appreciated that any of a variety of suitable alternative materials are contemplated for use in encapsulating material 74 .

[0020] Encapsulating material 74 can be much softer than lens cover 64 (e.g., the hardness of encapsulating material 74 can be less than the hardness of lens cover 64). In one embodiment, encapsulating material 74 can be a flowable material, such as a fluid or gel that can be injected or otherwise dispensed into interior 72 after lens cover 64 is assembled on base 56. In another embodiment, encapsulating material 74 can be applied to lens cover 64 and / or over base 56 and LED 60 before lens cover 64 is assembled on base 56.

[0021] Still referring to FIG. 5 , the lens cover 64 may include a protective coating 76 disposed on an outer surface 77 of the body 67. The protective coating 76 may be hydrophobic, oleophobic, and / or chemically resistant such that the outer surface of the body 67 of the lens cover 64 is protected from harmful environmental conditions that may otherwise adversely affect the optical performance of the optical lens element 70. The protective coating 76 may additionally or alternatively optically enhance the transmission quality of the optical lens element 70. In one embodiment, the protective coating 76 may be a thin film inorganic material that protects from environmental conditions (e.g., chemical etching) and also improves the overall transmission quality of the optical lens element 70. The thin film inorganic material may have a thickness between about 10 nm and about 200 nm and may have a refractive index greater than about 1.49. Some examples of suitable thin film inorganic materials include MgF2, CaF2, SiO2, Al2O3, and / or TiO2. Although the protective coating 76 is shown as a single layer arrangement, it should be understood that the protective coating 76 may alternatively be a multi-layer arrangement that is either homogeneous (multiple layers of the same material) or heterogeneous (multiple layers of different materials).

[0022] It should be understood that the light emitted by the first lighting module 24 can conform to an illumination profile (e.g., color range, overall distribution of light, thermal profile) defined by the physical configuration of the first lighting module 24 (e.g., the type of LEDs 60 used (e.g., monochromatic or multi-color), the physical layout of the LEDs 60, the optics provided by the optical lens element (e.g., 70), the encapsulation material (e.g., 74), the protective coating (e.g., 76), and the overall power consumption). Although various examples of physical configurations of the first lighting module are described above and shown in the accompanying drawings, it should be understood that any of a variety of suitable alternative physical configurations of the first lighting module 24 are contemplated for achieving a desired illumination profile.

[0023] Referring now to FIGS. 1 and 3 , a heat sink 78 may be disposed above each of the first and second lighting modules 24, 26 and may be configured to dissipate heat from the first and second lighting modules 24, 26. The heat sink 78 may be formed of any of a variety of thermally conductive materials, such as aluminum or copper. The heat sink 78 may be in contact with the base 56, 58 on the opposite side of the LED (e.g., 60). The heat generated by the LED (e.g., 60) may be transferred from the base 56, 58 to the heat sink 78 and dissipated into the surrounding environment through a plurality of fins 80. In one embodiment, a heat sink compound (not shown), such as a thermally conductive paste, may be provided between the base 56, 58 and the heat sink 78 to enhance thermal conductivity therebetween. Although the heat sink 78 is shown as an integral component provided above the first and second lighting modules 24, 26, it should be understood that a dedicated heat sink may be provided alternatively for each of the first and second lighting modules 24, 26.

[0024] Now referring to FIG. 3, the controller 82 can be disposed in the controller socket 52 and can be configured to power the first and second lighting modules 24, 26 and control the first and second lighting modules 24, 26. As shown in FIG. 1, the cover portion 54 of the cover member 44 can cover the controller socket 52 and the controller 82. The cover portion 54 can be used as a heat sink for the controller 82 and can include a plurality of fins 84 to promote heat dissipation from the controller 82. A heat dissipation compound (not shown), such as a thermally conductive paste, can be provided between the cover portion 54 and the controller 82 to enhance thermal conductivity therebetween. The main frame 42 and the cover member 44 can be formed of a thermally conductive material such as aluminum, for example. Heat from the first and second lighting modules 24, 26 and the controller 82 can be transmitted throughout the housing 22 to effectively supplement the cooling properties of the heat sink 78 and the cover portion 54.

[0025] 1 and 2, the housing 22 can define a channel 85 extending between the light support portion 30 and the controller support portion 32 so that the first and second lighting modules 24, 26 and the controller 82 are physically separated from each other. The channel 85 can be configured to allow air to flow between the light support portion 30 and the controller support portion 32 to enhance cooling of the first and second lighting modules 24, 26 and the controller 82 during operation. In one embodiment, as shown in FIG3, the housing 22 can include a plurality of rib members 86 extending between the light support portion 30 and the controller support portion 32 to provide structural rigidity therebetween.

[0026] Referring now to FIG. 6 , the controller 82 may include a power module 88 and an LED driver module 90. The power module 88 may be coupled to the LED driver module 90, and the LED driver module 90 may be coupled to each of the first lighting module 24 and the second lighting module 26 (e.g., in parallel). The power module 88 may include a power input 92 coupled to a power source (not shown), such as an A / C power source, for delivering external power to the power module 88 for powering the first and second lighting modules 24 , 26. The power module 88 may be configured to condition the external power from the power source (e.g., convert AC power to DC power) to facilitate powering the LEDs (e.g., 60). In one embodiment, the lamp 20 may be configured to operate at an input power between about 85VAC and about 347VAC (e.g., 750 watt load capacity).

[0027] The LED driver module 90 may include a control input 94 coupled to a control source (not shown) such as a greenhouse controller that delivers control signals to the LED driver module 90 for controlling the first lighting module 24 and the second lighting module 26, as described in further detail below. The LED driver module 90 may be configured to communicate according to any of a variety of suitable signaling protocols such as BACnet, ModBus, or RS485.

[0028] The power input 92 and the control input 94 can be routed to a jack 96 (FIGS. 2 and 6) configured to interface with a plug (not shown) that can deliver external power and control signals to the power supply module 88 and the LED driver module 90, respectively. In one embodiment, the jack 96 can be a Wieland-type connector, but other connector types are contemplated. It should be understood that although power and control signals are shown as being delivered through the jack 96 (e.g., via the same cable), the luminaire 20 can alternatively include separate ports for power and control signals so that the power and control signals are transmitted to the power supply module 88 and the LED driver module 90 along different cables.

[0029] The LED driver module 90 can be configured to control one or more of the intensity, color, and spectrum of the light generated by the LED (e.g., 60) according to time (e.g., light recipe). The LED driver module 90 can independently control the light recipes of the first lighting module 24 and the second lighting module 26 so that the first lighting module 24 and the second lighting module 26 define corresponding first lighting zones and second lighting zones that are independently controllable within the lighting environment. The light recipes of the first lighting zone and the second lighting zone can be customized accordingly to accommodate the lighting requirements of the plants provided within the lighting environment. For example, when the plants provided in each of the first lighting zone and the second lighting zone are the same (or have similar lighting requirements), the corresponding light recipes for the first lighting module 24 and the second lighting module 26 can be the same to provide a substantially uniform lighting environment between the first lighting zone and the second lighting zone. When the plant group provided in the first lighting zone has different lighting requirements than the plant group provided in the second lighting zone, the corresponding light recipes for the first and second lighting modules 24, 26 can be customized to accommodate the different lighting requirements between the plant groups. In one embodiment, the first lighting module 24 and the second lighting module 26 may have unique addresses such that the control signal may assign a separate lighting recipe to each of the first lighting module 24 and the second lighting module 26 (via the LED driver module 90) based on the unique addresses of the first lighting module 24 and the second lighting module 26. It should be understood that although the LED driver module 90 is described as being configured to control the light recipe of each of the first lighting module 24 and the second lighting module 26, the LED driver module 90 may additionally or alternatively be configured to control any of a variety of suitable alternative variable lighting features of the first lighting module 24 and the second lighting module 26 (e.g., any lighting feature that can be controlled in real time using a control signal).

[0030] The first and second lighting modules 24, 26 can be independent units that are physically separated from each other. In this way, the physical configuration and variable lighting characteristics of each of the first and second lighting modules 24, 26 can be individually selected to allow customization of the first and second lighting zones to achieve a desired lighting environment. In one embodiment, the first and second lighting modules 24, 26 can be swapped with different lighting modules during the life cycle of the plant to optimize the lighting environment of the plant throughout its life cycle.

[0031] 7-9 illustrate an alternative embodiment of a lens cover 164 that is similar or identical in many respects to the lens cover 64 of FIGS. 4 and 5 . For example, the lens cover 164 may include a body 167 that includes a bottom substrate 168 and a plurality of optical lens elements 170 extending from the bottom substrate 168. The bottom substrate 168 may be substantially planar and may define an outer perimeter P1. The body 167 may include a gasket channel 175 routed along the outer perimeter P1. The gasket channel 175 may accommodate a gasket (not shown) that engages with the base of the lighting module to create an effective seal therebetween.

[0032] The body 167 may include an outer surface 177 ( FIG. 7 ) and an inner surface 179. Each optical lens element 170 may protrude from the body 167 at the outer surface 177 and may define a recess 181 at the inner surface 179. The body 167 may be formed as an integral, one-piece construction such that the outer surface 177 and the inner surface 179 extend continuously along the body 167 and between the base substrate 168 and each optical lens element 170 to form a fluid-impermeable barrier therebetween. Thus, the body 167 may prevent any fluid introduced to the outer surface 177 from passing through the body 167 and reaching the inner surface 179.

[0033] Referring now to FIG. 9 , the body 167 can be coated with a parylene coating 176. In certain embodiments, the parylene coating 176 can be applied to the body 167 as a single coating instead of the protective coating 76. However, it should be understood that in certain embodiments, one or more additional layers and / or coatings can be applied over the parylene coating. In one embodiment, the parylene coating 176 can completely encapsulate the body 167 such that the entire body 167 (including the outer surface 177 and the inner surface 179) is covered with parylene. In another embodiment, only a portion of the body 167 (such as only the outer surface 177) is coated with parylene. In certain embodiments, the parylene coating 176 can be a conformal coating.

[0034] As with the protective coating 76, the poly-p-xylene coating 176 can provide protection for one or both of the outer surface 177 and the inner surface 179 of the body 167. The poly-p-xylene coating can also be transparent. In some embodiments, the poly-p-xylene coating 176 can be used as a barrier to protect the lens cover 164 from water vapor moisture, various chemicals (e.g., organic solvents), corrosive gases (e.g., ammonia) and free radicals, etc., which may otherwise have an adverse effect on the optical performance of the optical lens element. In one embodiment, the poly-p-xylene coating 176 can provide a gas barrier for the polycarbonate lens cover and prevent free radical damage to the polycarbonate lens cover. In addition, in some embodiments, the poly-p-xylene coating 176 can protect the lens cover 164 from extreme temperatures and ultraviolet radiation. In some embodiments, the poly-p-xylene coating 176 can provide durability, flexibility, high-frequency stability and low dielectric constant. The thickness of the poly-p-xylene coating 176 can be between about 0.5 microns and about 10 microns, although a variety of suitable alternative thicknesses can be envisioned to achieve the desired results. In some embodiments, the refractive index of the parylene coating 176 can be between the refractive index of air and the refractive index of the lens cover material (eg, polycarbonate).

[0035] In certain embodiments, the parylene coating 176 may include one or more of parylene N, parylene C, parylene D, parylene F (e.g., parylene AT-4 and / or parylene VT-4), parylene E, parylene M, and parylene AM-2, and copolymers thereof. The parylene obtained by polymerization of paraxylene may have a repeating unit of the formula:

[0036]

[0037] Specifically, parylene N is represented by the unsubstituted polymer units shown above. However, other types of parylenes can be provided by substituting hydrogen atoms on the benzene ring or aliphatic bridge. For example, parylene C includes chlorine atoms in the ring of each unit instead of hydrogen atoms, while parylene D includes two chlorine atoms in the ring of each unit instead of hydrogen atoms. Each of parylene AT-4 and parylene VT-4 (both of which are types of parylene F) includes four fluorine atoms in each unit. Parylene AT-4 includes fluorine atoms in the bridge, while parylene VT-4 includes fluorine atoms in the ring.

[0038] In one embodiment, parylene coating 176 includes a copolymer of parylene C and parylene N, which has, for example, a high temperature rating. However, each of the different types of parylene may provide various benefits, and the type or types of parylene employed in parylene coating 176 may depend on the properties desired for a particular application, taking into account various factors such as, for example, the type of lens cover 164, the material of which lens cover 164 is constructed, the intended use of lens cover 164, and the environment in which lens cover 164 is used.

[0039] The surfaces 177, 179 of the lens cover 164 may be prepared prior to applying the parylene coating 176. In certain embodiments, for example, one or both of the outer surface 177 and the inner surface 179 of the body 167 may be treated and / or cleaned to prime such surfaces 177, 179 to facilitate effective coating thereof. The treatment and cleaning methods used to prepare the surfaces 177, 179 of the lens cover 164 may include any suitable methods known in the art.

[0040] The parylene coating 176 can be applied to the body 167 of the lens cover 164 in a variety of ways. In certain embodiments, the parylene coating 176 can be applied to the body 167 by vacuum deposition, such as chemical vapor deposition ("CVD"); dip coating; spin coating; spray coating, such as via one or more spray guns; or any of a variety of other suitable known coating methods.

[0041] In one embodiment, the parylene coating is applied by a CVD process. The body 167 is placed in a deposition chamber. Then, parylene gas is introduced into the chamber as a precursor and deposited on the body 167. In some embodiments, the solid raw material dimer can be heated and evaporated to provide the parylene gas. The CVD process can be a low pressure CVD ("LPCVD"); however, it should be understood that any of a variety of other suitable known CVD methods can be used to coat the body 167 of the lens cover 164. The CVD process can facilitate the application of a conformal coating. In some embodiments, the CVD process can achieve a uniform parylene coating 176 on the surfaces 177, 179 of the lens cover 164, including oddly shaped parts and small cracks. In some embodiments, the parylene coating can be pinhole-free. In addition, the CVD process can allow a relatively thin parylene coating 176 with a consistent thickness to be applied.

[0042] The foregoing description of embodiments and examples has been presented for the purpose of illustration and description. It is not intended to be exhaustive or limited to the forms described. In view of the above teachings, many modifications are possible. Some of those modifications have been discussed, and those skilled in the art will understand other modifications. The embodiments are selected and described to illustrate various embodiments. Of course, the scope is not limited to the examples or embodiments set forth herein, but can be adopted by those of ordinary skill in the art in any number of applications and equivalent devices. On the contrary, it is hereby intended that the scope be limited by the appended claims. Moreover, for any method claimed and / or described, whether or not the method is described in conjunction with a flowchart, it should be understood that, unless otherwise indicated or required by the context, any explicit or implicit ordering of the steps performed in the execution of the method does not mean that those steps must be performed in the order presented, and can be performed in a different order or in parallel.

Claims

1. A lens cover for a lamp for an indoor planting facility, the lens cover comprising: A subject, the subject comprising: a bottom substrate that is substantially planar and defines an outer perimeter; and a plurality of optical lens elements extending from the base substrate and cooperating with the base substrate to define an outer surface and an inner surface of the lens cover, each of the plurality of optical lens elements being configured to align with a light emitting diode; and a parylene coating disposed on at least one of the outer surface and the inner surface of the body, wherein: the plurality of optical lens elements protrude from the base substrate at the outer surface; and The body is formed as an integral, one-piece structure such that the outer surface extends continuously between the base substrate and each of the plurality of optical lens elements to form a fluid-impermeable barrier therebetween.

2. The lens cover according to claim 1, wherein: Each optical lens element of the plurality of optical lens elements defines a recess at an inner surface.

3. The lens cover according to claim 1, wherein: The parylene coating completely encapsulates the body.

4. The lens cover according to claim 1, wherein: The body is formed entirely of polycarbonate or polymethyl methacrylate.

5. The lens cover according to claim 1, wherein: The parylene coating has a thickness between about 0.5 microns and about 10 microns.

6. The lens cover according to claim 1, wherein: The polyparaxylene coating includes polyparaxylene N, polyparaxylene C, polyparaxylene D, polyparaxylene F or copolymers thereof.

7. The lens cover according to claim 6, wherein: The polyparaxylene coating includes a copolymer of polyparaxylene N and polyparaxylene C.

8. The lens cover according to claim 1, wherein: The body includes a gasket channel routed along the outer perimeter.

9. The lens cover according to claim 1, wherein: The parylene coating is a conformal coating.

10. A lamp for an indoor planting facility, the lamp comprising: a housing defining a first portion and a second portion, the second portion defining a window; a controller disposed at least partially within the first portion; a first lighting module at least partially disposed in the second portion; a second lighting module, the second lighting module being at least partially disposed in the second portion adjacent to the first lighting module, each of the first lighting module and the second lighting module comprising: Base; and a plurality of light emitting diodes coupled to the base and configured to project light through the window; and a lens cover covering the plurality of light emitting diodes and comprising: A subject, the subject comprising: a bottom substrate that is substantially planar and defines an outer perimeter; and a plurality of optical lens elements extending from and cooperating with the base substrate to provide an outer surface and an inner surface, each optical lens element of the plurality of optical lens elements being aligned with a corresponding light emitting diode of the plurality of light emitting diodes; and a parylene coating disposed on at least one of the outer surface and the inner surface, wherein: The first lighting module and the second lighting module are physically independent of each other; the plurality of optical lens elements protrude from the base substrate at the outer surface; and The body is formed as an integral, one-piece structure such that the outer surface extends continuously between the base substrate and each of the plurality of optical lens elements to form a fluid-impermeable barrier therebetween.

11. The luminaire according to claim 10, wherein: The lens cover and the base cooperate to define an interior therebetween; and The lamp also includes an encapsulating material that substantially fills the interior and encapsulates the plurality of light emitting diodes; and The lens cover has a first hardness, and the encapsulation material has a second hardness less than the first hardness.

12. The lamp according to claim 11, wherein The second hardness is less than 70 Shore A.

13. The lamp according to claim 11, wherein The encapsulating material includes silicone gel.

14. The lamp according to claim 10, wherein: The body is formed entirely of polycarbonate or polymethyl methacrylate.

15. The lamp according to claim 10, wherein: Each optical lens element of the plurality of optical lens elements defines a recess in the inner surface.

16. The lamp according to claim 10, wherein: The housing defines a passage between the first portion and the second portion.

17. The lighting fixture of claim 16, further comprising a plurality of rib members extending between the first portion and the second portion and at least partially disposed in the channel.

18. A lens cover for a lamp for an indoor growing facility, the lens cover comprising: A subject, the subject comprising: a bottom substrate that is substantially planar and defines an outer perimeter; and a plurality of optical lens elements extending from the base substrate and cooperating with the base substrate to define an outer surface and an inner surface of the lens cover, each of the plurality of optical lens elements being configured to align with a light emitting diode; and a parylene coating disposed on at least one of the outer surface and the inner surface of the body, wherein: the plurality of optical lens elements protrude from the base substrate at the outer surface; and The body is formed as an integral, one-piece structure such that the outer surface extends continuously between the base substrate and each of the plurality of optical lens elements to form a fluid-impermeable barrier therebetween.

19. The lens cover according to claim 18, wherein: Each optical lens element of the plurality of optical lens elements defines a recess at an inner surface.

20. The lens cover according to claim 18, wherein: The parylene coating completely encapsulates the base substrate and the plurality of optical lens elements.

21. The lens cover according to claim 18, wherein: The body is formed entirely of polycarbonate or polymethyl methacrylate.

22. The lens cover according to claim 18, wherein: The parylene coating has a thickness between about 0.5 microns and about 10 microns.

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